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Prism is a Design System code generator developed by the team at Gett 🚕.

Synchronizing design teams with engineering teams is a huge challenge.

As teams scale, new growing pains start around how to properly align colors, text styles, spacing and other design details between teams, in a uniform way, from a single source of truth.

Prism was built to solve this very problem! It takes a Zeplin project or styleguide as input, and generates any output code you want from these based on a set of templates in your project, resulting in cross-platform code that is always synchronized from a single source-of-truth (Your project's Zeplin Styleguide or Project).

Prism is especially useful when used in your CI/CD process to remove the friction of design handoff and review, and making sure all of your teams are properly synchronized in regards to naming, values, and more.

Getting Started

📹 Videos

🌈 Getting Prism

There are five options to install prism:

  1. Install with Homebrew: brew install GettEngineering/tap/prism
  2. Install using Mint: mint install GettEngineering/Prism
  3. Build from source: make install
  4. Run directly with SPM: swift run prism generate
  5. Running on Windows (experimental)

🔑 Getting a Zeplin API Token

To use Prism, you'll need to generate a Personal Access Token (JWT) to Zeplin's API by going to https://app.zeplin.io/profile/developer and click the Create new token button in the Personal access tokens section:

Generating a Zeplin Personal Access Token

You'll need to expose this token to run the prism CLI tool. Make sure you have a ZEPLIN_TOKEN environment variable with your token configured.

When running prism in a CI environemnt, we recommend adding ZEPLIN_TOKEN as an Environment Secret.

When using prism locally or bootstrapping your project for the first time, you can simply run export ZEPLIN_TOKEN='zeplin_personal_token' before running prism locally.

👢 Bootstrap Prism for your Project

Inside your project folder, run prism init.

It will guide you through selecting a Zeplin project or styleguide as source along with other useful information for proper code generation. Once prism init is successful, you'll find a new .prism folder with a config.yml file outlining your preferences.

🎨 Creating Templates

Prism uses templates with the .prism suffix located in your project's .prism folder. These Prism templates are basically plain text files — Prism doesn't really care what format or language you use, it can make any kind of output as long as you can express it in a Prism template file.

Prism looks for something called Tokens inside your templates. These tokens follow the following format: {{%token%}}. You can find a couple of sample templates in the Examples folder.

Here are two short example of generating colors code for iOS and Android using Prism templates.


Color.swift iOS Prism Template


Color.swift Android Prism Template

Running on Windows (Experimental)

Due to the official release of Swift for Windows, an experimental build of prism is now available for Windows.

You'll need to install a few dependencies before running for the first time:

Note: Building from source is somewhat more involved. Let me know if you're interested in doing so and I'll do my best to assist.


  • Run make or make install to build a release binary of the prism CLI tool and install it to /usr/local/bin.
  • Run make build to build a release binary of the prism CLI tool
  • Run make project to create an Xcode project and start working.
  • Run make test to run all tests.
  • Run make clean to clear the generated Xcode project.


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Prism v0.6, It's Windows time! - 2020-10-04 17:48:47

Thanks to the release of Swift for Windows, this version includes an experimental, yet fully-featured release of Prism for windows. See attached prism.exe in this release including instructions in the README file.

Thanks to @compnerd for his massive assistance in making this work.


This version also fixes an existing issue where templates stored in any folder hierarchy were processed as a flat hierarchy to the output folder. Now, the directory structure is preserved.

Prism 0.5.0 - 2020-08-14 03:41:43

  • Allow generating code from either a Project or a Styleguide [#40]
  • Add textStyle.lineSpacing token [#42]
  • Various internal improvements

Prism 0.4.1 - 2020-07-04 15:03:22

This is a recommended bug fix / patch release

  • Fix an issue where a styleguide might not be found if the consumer isn't a member of the styleguide, even if they're a member of the linked project. (#37)

  • Better support for special characters in asset identities (#38)

Prism 0.4.0 #BlackLivesMatter - 2020-06-16 14:54:40

  • Add support for kebab-case and PascalCase identities (#32)
  • Allow using ! to invert template conditionals (#30)
  • Support isFirst and isLast for asset loops (colors, text styles, spacings) (#30)
  • Add support for font weight, font style and font stretch (#29)
  • Support text styles that have no color attached to them (#22)
  • Round font size to nearest two decimal points (#33)
  • Various bug fixes and optimizations

Prism 0.3.0 - 2020-04-30 16:36:55

📣 Prism 0.3.0 is out! 🎉😃

Thanks for all the great feedback and ideas for Prism! Keep 'em coming, we're always excited to improve and expand Prism's capabilities and support.

Here are some updates since 0.2:

  • Support for Zeplin's new Spacing feature (#17)
  • Recursively fetch resources (colors, text styles) in multi-paged settings (e.g. when there are more than 100 of either) (#16)
  • Fix edge-cases where transformations have spacing around them (#20)
  • Fully support Linux
  • Update Swift Tools to 5.2

Prism 0.2.0 - 2020-04-30 16:20:37

📣 Prism 0.2 is out! 🎉😃

Thanks for all the great feedback and ideas for Prism! Here are some updates since 0.1:

  • Letter Spacing & Line Height now have friendly 2-precision rounding #15 (Thanks @artemnovichkov!)
  • prism now uses swift-argument-parser for parsing its arguments
  • We also switched to CI for this repo to use GitHub Actions!
  • Add examples on generating SwiftUI style code with custom modifiers
  • You can now install Prism via Homebrew
  • Add instructions for installation via Mint
  • Build-in reserved colors have been removed, but they can still be set in reserved_colors (along with reserved_textstyles) in .prism/config.yml

Prism 0.1 - 2020-02-25 13:52:07

Initial version! 🥳