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stevengharris/MarkupEditor 0.6.0
WYSIWYG editing for SwiftUI and UIKit apps
⭐️ 248
🕓 7 weeks ago
iOS macCatalyst
.package(url: "https://github.com/stevengharris/MarkupEditor.git", from: "0.6.0")

iOS 14.5+ MacCatalyst 14.5+ Twitter: @stevengharris


WYSIWYG editing for SwiftUI and UIKit apps.

Jealous of those JavaScript coders with their WYSIWYG text editors, but just can't stomach the idea of immersing yourself in JavaScript when you're enjoying the comfort and joy of Swift? Yeah, me too. So when I was forced to do it, I thought I'd share what I did as a way to help others avoid it.



MarkupEditor Goals and Non-Goals

I am working on a larger project that requires embedded support for "rich text" editing. WYSIWYG editing is a must-have requirement for me. I could have forced my developer-users to use Markdown, but I find it to be annoying both to write and to look at while writing. Who wants to have to mentally filter all that cruft on the screen? Sure, it's a lot better than editing raw HTML; but come on, this is the 21st century. Having to deal with an editing experience where you use some kind of "preview mode" to make sure that what you are writing will be presented like you expect feels like CI/CD for writing.

Still, I wanted an editing experience that didn't get in the way. I wanted something with the feature-simplicity of Markdown, but presented in a clean, what-you-see-is-what-you-get manner that supported the basics people expect:

  1. Styling
    • Present a paragraph or header with a predefined font size
    • Bulleted and numbered lists
    • Indenting and outdenting of text
  2. Formatting
    • Bold, italic, underline, code, strikethrough, sub- and super-scripting
  3. Embedding
    • Images
    • Tables
    • Links

As you might expect, then, this feature set is pretty darned close to Markdown - or at least a GitHub flavor of Markdown. And as soon as you do WYSIWYG editing, you must support undo/redo properly. The feature list doesn't include some things you might expect from your favorite word processor:

  • Colored text
  • Highlighting
  • Font size changes (except as implied by identifying something as a paragraph or header)

If you want a richer feature set, you can extend the MarkupEditor yourself. The demos include examples of how to extend the MarkupEditor's core features and how to interact with the file system for selecting what to edit. It's my intent to keep the core MarkupEditor feature set to be similar to what you will see in GitHub Markdown.

What is WYSIWYG, Really?

The MarkupEditor is presenting an HTML document to you as you edit. It uses JavaScript to change the underlying DOM and calls back into Swift as you interact with the document. The MarkupEditor does not know how to save your document or transform it to some other format. This is something your application that consumes the MarkupEditor will need to do. The MarkupEditor will let your MarkupDelegate know as the underlying document changes state, and you can take advantage of those notifications to save and potentially transform the HTML into another form. If you're going to do that, then you should make sure that round-tripping back into HTML also works flawlessly. Otherwise, you are using a "What You See Is Not What You Get" editor, which is both less pronounceable and much less useful to your end users.

Installing the MarkupEditor

You can install the Swift package into your project, or you can build the MarkupEditor framework yourself and make that a dependency.

Swift Package

Add the MarkupEditor package to your Xcode project using File -> Swift Packages -> Add Package Dependency...


Clone this repository and build the MarkupFramework target in Xcode. Add the MarkupEditor.framework as a dependency to your project.

Using the MarkupEditor

Behind the scenes, the MarkupEditor interacts with an HTML document (created in markup.html) that uses a single contentEditable DIV element to modify the DOM of the document you are editing. It uses a subclass of WKWebView - the MarkupWKWebView - to make calls to the JavaScript in markup.js. In turn, the JavaScript calls back into Swift to let the Swift side know that changes occurred. The callbacks on the Swift side are handled by the MarkupCoordinator. The MarkupCoordinator is the WKScriptMessageHandler for a single MarkupWKWebView and receives all the JavaScript callbacks in userContentController(_:didReceive:). The MarkupCoordinator in turn notifies your MarkupDelegate of changes. See MarkupDelegate.swift for the full protocol and default implementations.

That sounds complicated, but it is mostly implementation details you should not need to worry about. Your app will typically use either the MarkupEditorView for SwiftUI or the MarkupEditorUIView for UIKit. The MarkupDelegate protocol is the key mechanism for your app to find out about changes as the user interacts with the document. You will typically let your main SwiftUI ContentView or your UIKit UIViewController be your MarkupDelegate. You can customize the behavior of the MarkupEditor using the MarkupEditor struct (e.g., MarkupEditor.toolbarStyle = .compact).

The MarkupToolbar is a convenient, pre-built UI to invoke changes to the document by interacting with the MarkupWKWebView. You don't need to use it, but if you do, then the easiest way to set it up is just to let the MarkupEditorView or MarkupEditorUIView handle it automatically. Your application may require something different with the toolbar than what the MarkupEditorView or MarkupEditorUIView provides. For example, you might have multiple MarkupEditorViews that need to share a single MarkupToolbar. In this case, you should specify MarkupEditor.toolbarPosition = .none. Then, for SwiftUI, use the MarkupEditorView together with the MarkupToolbar as standard SwiftUI views, identifying the MarkupEditor.selectedWebView by responding to the markupTookFocus(_:) callback in your MarkupDelegate. For UIKit, you can use the MarkupEditorUIView and MarkupToolbarUIView. See the code in the MarkupEditorView or MarkupEditorUIView for details.

To avoid spurious logging from the underlying WKWebView in the Xcode console, you can set OS_ACTIVITY_MODE to disable in the Run properties for your target. However, this has the side-effect of removing OSLog messages from the MarkupEditor from showing up, too, and is probably not a good idea in general.

SwiftUI Usage

In the simplest case, just use the MarkupEditorView like you would any other SwiftUI view. By default, on all but phone devices, it will place a MarkupToolbar above a UIViewRepresentable that contains the MarkupWKWebView, which is where you do your editing. On phone devices, it will make the toolbar the inputAccessoryView for the MarkupWKWebView, giving you access to the toolbar when the keyboard shows up. Your ContentView can act as the MarkupDelegate, which is almost certainly what you want to do in all but the simplest applications. The MarkupEditorView acts as the MarkupDelegate if you don't specify one yourself.

import SwiftUI
import MarkupEditor

struct SimplestContentView: View {
    @State private var demoHtml: String = "<h1>Hello World</h1>"
    var body: some View {
        MarkupEditorView(html: $demoHtml)

UIKit Usage

In the simplest case, just use the MarkupEditorUIView like you would any other UIKit view. By default, on all but phone devices, it will place a MarkupToolbarUIView above a MarkupWKWebView, which is where you do your editing. On phone devices, it will make the toolbar the inputAccessoryView for the MarkupWKWebView, giving you access to the toolbar when the keyboard shows up. Your ViewController can act as the MarkupDelegate, which is almost certainly what you want to do in all but the simplest applications. The MarkupEditorUIView acts as the MarkupDelegate if you don't specify one yourself.

import UIKit
import MarkupEditor

class SimplestViewController: UIViewController {
    override func viewDidLoad() {
        let markupEditorUIView = MarkupEditorUIView(html: "<h1>Hello World</h1>")
        markupEditorUIView.frame = view.frame
        markupEditorUIView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

Customizing The Toolbar

You can use either a compact style of toolbar with only buttons, or a labeled form that shows what each button does. The default style is labeled. If you want to use the compact form, set MarkupEditor.style to .compact.

You can customize the various toolbars by eliminating them and/or subsetting their contents. You do this by creating a new instance of ToolbarContents and assigning it to ToolbarContents.custom. The MarkupMenu also uses the ToolbarContents to customize what it holds, so it's important to have set ToolbarContents.custom before creating the MarkupMenu. An easy way to do that is to set it up in your AppDelegate by overriding init(). Here is an example that adds the CorrectionToolbar (that holds the Undo and Redo buttons and is off by default) and only includes Bold, Italic, and Underline as formats in the FormatToolbar. It also sets up to use the compact style and to allow local images (as discussed below):

override init() {
    MarkupEditor.style = .compact
    MarkupEditor.allowLocalImages = true
    let myToolbarContents = ToolbarContents(
        correction: true,  // Off by default but accessible via menu, hotkeys, inputAccessoryView
        // Remove code, strikethrough, subscript, and superscript as formatting options
        formatContents: FormatContents(code: false, strike: false, subSuper: false)
    ToolbarContents.custom = myToolbarContents

Local Images

Being able to insert an image into a document you are editing is fundamental. In Markdown, you do this by referencing a URL, and the URL can point to a file on your local file system. The MarkupEditor can do the same, of course, but when you insert an image into a document in even the simplest WYSIWYG editor, you don't normally have to think, "Hmm, I'll have to remember to copy this file around with my document when I move my document" or "Hmm, where can I stash this image so it will be accessible across the Internet in the future." From an end-user perspective, the image is just part of the document. Furthermore, you expect to be able to paste images into your document that you copied from elsewhere. Nobody wants to think about creating and tracking a local file in that case.

The MarkUpEditor refers to these images as "local images", in contrast to images that reside external to the document. Both can be useful! When you insert a local image (by selecting it from the Image Toolbar or by pasting it into the document), the MarkupEditor creates a new image file using a UUID for the file name. By default, that file resides in the same location as the text you are editing. For the demos, the document HTML and local image files are held in an id subdirectory of the URL found from FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask). You can pass the id to your MarkupWKWebView when you create it - for example, it might be the name of the document you're editing. When the MarkupEditor creates a new local image file, your MarkupDelegate receives a notification via the markupImageAdded(url: URL) method, giving you the URL of the new local image.

Although local image support was a must-have in my case, it seems likely some MarkupEditor consumers would feel like it's overkill or would like to preclude its use. It also requires you to do something special with the local images when you save your document. For these reasons, there is an option to control whether to allow selection of images from local files. Local images are disallowed by default. To enable them, specify MarkupEditor.allowLocalImages = true early in your application lifecycle. This will add a Select button to the Image Toolbar.

A reminder: The MarkupEditor does not know how/where you want to save the document you're editing or the images you have added locally. This is the responsibility of your app.


This section addresses searching within the document you are editing using the MarkupEditor but also provides some guidance on searching for the documents you create or edit using MarkupEditor.

Searching Within A Document

For many applications, you will have no need to search the content you are editing in the MarkupEditor. But when content gets larger, it's very handy to be able to find a word or phrase, just like you would expect in any text editor. The MarkupEditor supports search with the function:

func search(
    for text: String,
    direction: FindDirection,
    activate: Bool = false,
    handler: (() -> Void)? = nil

The FindDirection is either .forward or .backward, indicating the direction to search from the selection point in the document. The MarkupWKWebView scrolls to make the text that was found visible.

Specify activate: true to activate a "search mode" where Enter is interpreted as meaning "search for the next occurrence in the same direction". Often when you are searching in a large document, you want to just type the search string, hit Enter, see what was selected, and hit Enter again to continue searching. This "search mode" style is supported in the MarkupEditor by capturing Enter on the JavaScript side and interpreting it as searchForNext until you do one of the following:

  1. You invoke MarkupWKWebView.deactivateSearch(handler:) to stop intercepting Enter, but leaving the search state in place.
  2. You invoke MarkupWKWebView.cancelSearch(handler:) to stop intercepting Enter and clear all search state.
  3. You click-on, touch, or otherwise type into the document. Your action automatically disables intercepting of Enter.

Note that by default, search mode is never activated. To activate it, you must use activate: true in your call to MarkupWKWebView.search(for:direction:activate:handler:).

The SwiftUI demo includes a SearchableContentView that uses a SearchBar to invoke search on demo.html. The SearchBar is not part of the MarkupEditor library, since it's likely most users will implement search in a way that is specific to their app. For example, you might use the .searchable modifier on a NavigationStack. You can use the SearchBar as a kind of reference implementation, since it also demonstrates the use of "search mode" by specifying activate: true when you submit text in the SearchBar's TextField.

Searching for MarkupEditor Documents

You can use CoreSpotlight to search for documents created by the MarkupEditor. That's because CoreSpotlight already knows how to deal properly with HTML documents. To be specific, this means that when you put a table and image in your document, although the underlying HTML contains <table> and <image> tags, the indexing works on the DOM and therefore only indexes the text content. If you search for "table" or "image", it won't find your document unless there is a text element containing the word "table" or "image".

How might you make use of CoreSpotlight? Typically you would have some kind of model object whose contents includes the HTML text produced-by and edited-using the MarkupEditor. Your model objects can provide indexing functionality. Here is an example (with some debug printing and <substitutions> below):

/// Add this instance of MyModelObject to the Spotlight index
func index() {
    let attributeSet = CSSearchableItemAttributeSet(contentType: UTType.html)
    attributeSet.kind = "<MyModelObject>"
    let contentData = contents.data(using: .utf8)
    // Set the htmlContentData based on the entire document contents
    attributeSet.htmlContentData = contentData
    if let data = contentData {
        if let attributedString = try? NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil) {
            // Put a snippet of content in the contentDescription that will show up in Spotlight searches
            if attributedString.length > 30 {
                attributeSet.contentDescription = "\(attributedString.string.prefix(30))..."
            } else {
                attributeSet.contentDescription = attributedString.string
    // Now create the CSSearchableItem with the attributeSet we just created, using MyModelObject's unique id
    let item = CSSearchableItem(uniqueIdentifier: <MyModelObject's id>, domainIdentifier: <MyModelObject's container domain>, attributeSet: attributeSet)
    item.expirationDate = Date.distantFuture
    CSSearchableIndex.default().indexSearchableItems([item]) { error in
        if let error = error {
            print("Indexing error: \(error.localizedDescription)")
        } else {
            print("Search item successfully indexed!")

/// Remove this instance of MyModelObject from the Spotlight index
func deindex() {
    CSSearchableIndex.default().deleteSearchableItems(withIdentifiers: [idString]) { error in
        if let error = error {
            print("Deindexing error: \(error.localizedDescription)")
        } else {
            print("Search item successfully removed!")

Once you have indexed your model objects, you can then execute a case-insensitive search query to locate model objects that include a text String like this:

let queryString = "domainIdentifier == \'\(<MyModelObject's id)\' && textContent == \"*\(text)*\"c"
searchQuery = CSSearchQuery(queryString: queryString, attributes: nil)
searchQuery?.foundItemsHandler = { items in
    ... Append contents of items to an array tracking the MyModelObjects that contain text
searchQuery?.completionHandler = { error in
    ... Do whatever you need afterward, such as additional filtering
// Then run the query

Then, if you need to locate the text in the document itself once you dereference it from the id, you would use the approach in Searching Within A Document on a MarkupWKWebView containing the contents.


There are three test targets: BasicTests, UndoTests, and RedoTests. Proper undo and redo has been one of the more challenging parts of the project. Essentially, every time the MarkupEditor implements changes to the underlying DOM, it also has to support undoing and redoing those changes. (As a historical aside, the MarkupEditor does not use the deprecated HTML document.execCommand, except in a very limited way. The execCommand takes care of undo and redo for anything you use it for. For example, if you use document.execCommand('bold') to bold the document selection, undo and redo "just work", albeit leaving behind various spans and styles in their wake. Because the MarkupEditor doesn't use execCommand, the undo and redo logic for every operation supported by the MarkupEditor has been hand-crafted with a mixture of love, frustration, and occasional anger.)

The BasicTests target tests the "do" operations; i.e., the operations you can perform via the MarkupWKWebView API or one of the toolbars. The UndoTests do all the "do" operations of the BasicTests, plus the "undo" of each one to make sure the original HTML is restored. The RedoTests do all the "do" and "undo" operations, plus the "redo" of each one to make sure the results of the original "undo" are restored. As a result, running just the RedoTests will also do the equivalent of the UndoTests, and running UndoTests will also do the the equivalent of running BasicTests. The RedoTests take a while to run and can be considered to be a comprehensive run through the MarkupEditor functionality.


If you consume just the package, you don't get the demo targets to build. If you create a workspace that contains the MarkupEditor project or just clone this repository, you will also get the two demo targets, creatively named SwiftUIDemo and UIKitDemo. There is also a MarkupEditor framework target in the project that is 100% the equivalent of the Swift package. By default, the demos both consume the framework, because I have found it to be a lot less hassle when developing the project in the early stage. The only difference between consuming the framework and the Swift package is how the MarkupWKWebView locates and loads its markup.html resource when it is instantiated.

The demos open demo.html, which contains information about how to use the MarkupEditor as an end user and shows you the capabilities. They populate the leftToolbar of the MarkupToolbar to include a FileToolbar that lets you create a new document for editing or open an existing HTML file. The DemoContentView (or DemoViewController in the UIKitDemo) acts both as the MarkupDelegate and the FileToolbarDelegate. As the FileToolbarDelegate, it opens a TextView to display the underlying raw HTML, which is nice for demo. The raw HTML updates as you type and make changes to the document, which is fun and has been helpful for debugging; however, you probably don't want to be doing heavyweight things like that for every keystroke in a real app.

The demo directories also contain a "Simplest" version of a SwiftUI View and UIKit UIViewController, since the DemoContentView and DemoViewController for the demos are more complex, with pickers and the raw HTML display brought in with the FileToolbar, and the support for selecting local images. If you want to try the "Simplest" versions out, just edit the SceneDelegate to point at the SimplestContentView or SimplestViewController.

As discussed in the Searching Within A Document section, a SwiftUI SearchableContentView is also provided to demonstrate the ability to search within a MarkupEditor HTML document, along with a SearchBar to invoke the functionality.


The current version is a feature-complete Beta. I am now consuming it myself in another project I am developing, so changes are being driven primarily by MarkupEditor uptake in that project (and any issues people might raise).

Known Issues

Issues are being tracked on GitHub.


Version 0.6.0 (Beta 2)

There have been a lot of changes since Beta 1 was released. Beta 2 pulls them all together in what I hope is closer to a proper release candidate.


Closed Issues

Version 0.5.1 (Beta 1)

Fix a tagging issue for the Swift package.

Version 0.5.0 (Beta 1)

This is the first Beta release for the MarkupEditor! Please see the announcement and discussion about it.

Closed Issues
  • Replace LinkToolbar and ImageToolbar with popovers (Issue 42)
  • Build from package is broken on iOS (Issue 47)
  • Touch device selection doesn't work properly (Issue 48)
  • Make paragraph style an optional part of StyleToolbar (Issue 49)

Version 0.4.0

I consider this release to be feature complete with the exception of some remaining UX problems on touch devices. If you were consuming earlier versions, you may encounter breaking changes, but I wanted to get those done before Beta. For example, the MarkupWebView previously was a UIViewRepresentable of the MarkupWKWebView. It has been eliminated in favor of a SwiftUI MarkupEditorView and a separate MarkupWKWebViewRepresentable.

The major drivers of the pre-Beta work have been usability and proper support for touch devices. This release also completely eliminates any need for a user to know about the SubToolbar, which previous versions surfaced because of the need to overlay it on the MarkupWKWebView. This release includes a new MarkupEditorView and MarkupEditorUIView for SwiftUI and UIKit respectively. These Views/UIViews lay out and manage the MarkupToolbar and (new) MarkupToolbarUIView, providing a simpler end-user experience when you just want to drop in a View/UIView. There are lots of other improvements and features as outlined below.

Closed Issues
  • Multi-indent/outdent operations work (Issue 13)
  • Easy image resizing (Issue 14) [pinch gesture support underway now]
  • Table sizer works on touch devices (Issue 15)
  • User settable table bordering (Issue 16)
  • Complete menu/hotkey support that syncs with the ToolbarContents (Issue 17)
  • Toolbar visible selection state works properly for large selections (Issue 18)
  • Pasting HTML works properly (Issue 20)
  • Enter at end of indent outdents until no longer indented (Issue 21)
  • Block quote outdent works on one line at a time (Issue 22)
  • Easily customizable toolbar contents using ToolbarContents (Issue 31)
  • Support pinch gesture for image resizing (Issue 38)
  • InputAccessoryView disappears on device rotation (Issue 39)
  • Provide context menus (copy/cut/paste) (Issue 45)
  • MarkupEditor struct provides central access to configuration/customization
  • MarkupEditorView sets up and manages the MarkupToolbar automatically for SwiftUI development
  • MarkupEditorUIView set up and managed MarkupToolbarUIView automatically for UIKit development
  • MarkupWKWebView automatically installs a customized MarkupToolbarUIView as the inputAccessoryView
  • Eliminate need for users to set up EnvironmentObjects to use the MarkupEditor as in previous versions

Version 0.3.3

  • Run build and tests on main using GitHub actions.
  • Start using the GitHub issue tracker and PRs to monitor issues prior to Beta.
  • Support multi-list operations.
  • Support multi-indent/outdent operations.

Version 0.3.2

This is an intermediate release in support of multi-element operations. A multi-element operation involves selecting multiple elements (e.g., paragraphs or formatted text elements - basically a large selected area in the document) and applying an operation like changing styles, formatting (e.g., bold, italic), or list attributes.

  • Support multi-style operations.
  • Support multi-format operations.

Version 0.3.1

This version is getting closer feature-complete on Mac Catalyst. There have been some API changes from the 0.2 version, primarily driven by the new support for local images.

  • Support local images in the edited document, the ability to insert an image from file as opposed to an external URL.
  • Refactor tests into BasicTests, UndoTests, and RedoTests. Tests have no dependency on a host app.
  • All operations support undo/redo properly (with the exception of selections across paragraphs, as cited in Known Issues).
  • Support pasting HTML and images. (Previously only plain text was supported.)
  • Menus work in the demos but are still incomplete.
  • List editing responds properly to the Enter key at beginning, inside, and end of list items. Enter in an empty list item outdents until exiting the list.
  • Tab is now strictly a table navigation mechanism and is no longer associated with indent/outdent operations.

Version 0.2.2

The labeled toolbar took up too much screen real estate in my other project, so I created a .compact form and made that selectable via ToolbarPreference. Now I have a way to add other preferences easily. I also needed a better way to communicate the selectionState and selectedWebView when I have an arbitrary number of MarkupWebViews being editing using a single MarkupToolbar. I set up MarkupEnv to accomplish that and adjusted the SwiftUIDemo and UIKitDemo to use it.

  • Add this History section to the README.
  • Make the toolbar configurable between .compact (the new default) and .labeled via ToolbarPreference.
  • Use MarkupEnv to access the selectionState and selectedWebView.
  • Bundle loading logic now depends on SWIFT_PACKAGE in MarkupWKWebView, not my homegrown USEFRAMEWORK setting.
  • Some minor adjustments to backgrounds and css to fix issues when the MarkupToolbar and MarkupWebView were embedded in other SwiftUI views.

Version 0.2.1

  • This was the first version made public and open sourced.

Legacy and Acknowledgements

When I started my search for an open source "Swift WYSIWYG editor", I found a kind of mishmash of things. The RichEditorView was one of the most visible. The RichEditorView was originally built using UIWebView, which has long been deprecated. A couple of people forked and ported it to WKWebView and shared their work. I used that for a while in some work I was doing, but I kept hitting edges and felt like I was having to put a lot of work into a fork that would never really see the light of day. The thought of moving the result into SwiftUI was making me queasy. The MarkupEditor is meant to be a proper "modern" version for WYSIWYG editing you can use in your SwiftUI or UIKit project, but it was hatched in the original RichEditorView.

The MarkupEditor's approach of using an HTML document containing a contentEditable DIV under the covers seems like a good idea until you read Nick Santos' article about Why ContentEditable is Terrible. His main arguments center around WYSIWYG, and the meaning of the term when editing a document in this way. In the simplest case, consider if you save the HTML you edited using the MarkupEditor and then use a different CSS to display it in a different browser. What you saw when you edited will certainly not be what you get. The text content will be 100% the same, of course. If what you are editing and saving remains in the same HTML form and is presented using the same CSS using a WKWebView, then it will be WYSIWYG. In any case, you need to think about it when adopting this approach.

The MarkupEditor has the advantage of not supporting arbitrary HTML, and in fact, owns the definition of the exact subset of HTML that is allowed. It is targeted only at WKWebView, so there are no browser portability problems. The restrictions on functionality and the absence of styling elements from the HTML help avoid some of the problems cited in his article. Also, by avoiding use of (the now deprecated but likely to live forever) Document.execCommand to perform editing tasks against the DOM, the MarkupEditor avoids WebKit polluting the "clean" HTML with spans and styles.

In case you think "To heck with this contentEditable nonsense. How hard can it be to build a little editor!?", I refer you to this article on lord.io. I did not enjoy writing JavaScript while implementing this project, but the DOM and its incredibly well-documented API are proven and kind of amazing. To be able to ride on top of the work done in the browser is a gift horse that should not be looked in the mouth.


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