About this app
Learn Scheme, the elegant Lisp dialect that shaped modern programming. (LispLab) helps you go from your first parenthesis to real fluency with 90 structured lessons, a built-in REPL, and hands-on exercises. Study core ideas like lists, functions, recursion, higher-order functions, and data structures one day at a time. Features: • 90 guided Scheme lessons • Built-in REPL and interpreter • Exercises with hints and instant feedback • Progress tracking and daily streaks • Light, dark, and automatic themes Perfect for beginners, students, and programmers exploring functional programming.
Latest release
What’s New
Fixed issue with REPL: you can now quit it! Before, the keyboard would cover the navigation buttons. Now a new close button or (quit), (exit), quit, or exit will do the trick. Corrected some details within the lessons. Added REPL command history (tap on an earlier command in the terminal) "Run in REPL" mode from within lessons. (help) command for information as you code.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 22, 2026 · 2:42 PM Free
Screenshots
