SUPPORT THE PROJECT
There is nothing to pay
No donations are set up, and there is no tip jar to click. If that changes it will be optional and it will be said plainly here — the app will not start asking.
What helps more than money
Tell it what broke
A bug report with the PDF that wouldn't open, or the sentence that got corrected wrongly, is worth an afternoon of guessing.
Open an issue ↗Make it findable
Star the repo, or mention it to the one person you know who is stuck at B1 and paying monthly for it.
Star on GitHub ↗Write a lesson
Grammar topics are plain files. If you teach your language, a topic you know well is a pull request anyone can review.
Contributing guide ↗If donations ever open
They would cover a code-signing certificate, a Mac to build on, and nothing else. Arty would stay free and complete either way — paying would never unlock a feature.