OPEN SOURCE

Credits and licenses

Why this page exists

YapZee runs on other people's code, and so does this website. Most of it carries an MIT license, and MIT asks for one thing in return: the copyright notice travels with the software. Apache 2.0 and the SIL Open Font License want the same, worded a little differently.

So here's the list. None of these people know this app exists, and that doesn't change what's owed.

The website

Everything running at yapzee.ai, including the page you're reading.

GSAP is the odd one out. It drives the scrolling film on the language pages, and GreenSock licenses it under their own standard no-charge terms rather than MIT. Those terms live at gsap.com/standard-license.

Next.js · MIT
React and React DOM · MIT
Tailwind CSS · MIT
Lenis · MIT
GSAP · GreenSock standard no-charge license

The app

The iOS and Android build. LiveKit is the Apache 2.0 entry, and Apache asks for a copy of the license itself to ship with the software, not only a mention of the name.

React Native · MIT
Expo, Expo Router and the expo modules · MIT.
React Native Reanimated · MIT.
React Native Gesture Handler · MIT.
react-native-svg · MIT.
NativeWind · MIT.
Supabase JS · MIT.
LiveKit client and LiveKit React Native · Apache 2.0.
Sentry for React Native · MIT.
PostHog for React Native · MIT.
lucide-react-native · ISC.
libphonenumber-js · MIT.
AsyncStorage for React Native · MIT.
react-native-shake · MIT.
react-native-view-shot · MIT.

Fonts

The notebook theme uses Luckiest Guy for display headings, Shantell Sans for handwritten labels, DM Sans for body text and Martian Mono for small reference labels.

The website serves these fonts locally, with their license files beside them.

The mobile app also keeps Lora for reading passages.

Luckiest Guy · Apache License 2.0.
Shantell Sans · SIL Open Font License 1.1.
DM Sans · SIL Open Font License 1.1.
Martian Mono · SIL Open Font License 1.1.
Lora · SIL OFL 1.1 · Copyright 2011 The Lora Project Authors, with Reserved Font Name "Lora"

Sound

The sound effects on this site, and the lo-fi bed under them, were made with ElevenLabs. That's audio rather than code, so it won't turn up in a generated license file.

The full license texts

A hand-typed credits list is right the day it's written and quietly wrong a month later. Dependencies move, and nobody remembers to come back and edit the page.

The fix is to stop typing it and generate it from the dependency tree instead, straight out of the package manifests. That isn't wired into the build yet, so read the lists above as a summary of what ships rather than as the license text.

What isn't here

Count the build tooling and the dependency tree runs long. Almost all of that is compilers and linters that never leave the machine doing the building. None of it gets distributed, so none of it carries a notice obligation, and listing it would bury the couple of dozen entries that actually reach your phone.

Corrections

If your work is in here and it isn't on this page, or the license is listed wrong, tell us and it gets fixed.

Write to support@yapzee.ai, or use the form on the help page. One person reads that mailbox, and it's the person who built the app. Replies arrive from a personal address rather than a yapzee.ai one, which is expected and not someone impersonating support.