learnFORTH1.5 - App Store
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Publisher Description
It's time to learn Forth, the compact stack-based language that powered navigation computers, embedded systems, and a generation of hands-on hackers - and still runs the boot firmware on some retro Sun and Apple hardware. If you ever saw a Jupiter ACE home computer, now is your change to learn about what made it special.
This app teaches you to think in words and stacks with 90 short, structured daily lessons, a live REPL you can experiment in right on your phone or iPad, and hands-on exercises with hints (not answers) so you actually learn the ideas.
WHAT'S INSIDE
. 90 guided lessons across 7 topics: the data stack, words & variables, control flow, loops & recursion, advanced words, data structures, and advanced topics.
. A built-in REPL with syntax highlighting so you can type real FORTH and see the stack respond immediately.
. Exercises for every lesson, graded on output, with an optional hint if you get stuck.
. Daily streaks and per-category progress tracking to keep you moving. You'll learn, promise!
. A plain-English primer on Reverse Polish Notation and stack manipulation (DUP, DROP, SWAP, OVER, ROT) for complete beginners.
. Historical notes on FORTH's dialects - fig-FORTH, Forth-79, Forth-83, ANS Forth - and which one this app's interpreter follows.
. A tip-of-the-hat to the Jupiter ACE, the British home computer from the 1980s that was based on Forth.
. A recommended reading list of classic FORTH books, including Starting FORTH and Thinking Forth by Leo Brodie.
. Light, dark, and automatic themes.
No prior programming experience required. If you've ever wondered how a language with almost no syntax can still get real work done, learnFORTH will show you, one word at a time.
Note: This app is free, with all features always available. If you enjoy it, please use the tip feature to thank the author and encourage future development.
Version History Edited some lessons to be clearer.
Added more example programs.
Created a list of default Forth words and their definitions. 1.5 Sep 15 Animated the stack representation in the REPL. Looks neat! 1.4 Sep 3 Some more lesson refinements, and a nicer way of viewing the stack in the REPL to help you visualize what your code is doing. 1.3 Aug 30 Some more lesson refinements.
Example Forth programs to read, run and learn from.
Increased the smug sense of satisfaction you'll get from knowing Forth. 1.2 Aug 27 • Improved early stack lessons with clearer examples for ., OVER, ROT, -ROT, CELLS, and memory offsets.
• Exercise attempts now start from a clean interpreter state.
• Fixed exercise state, lesson formatting, REPL controls, history management, and HELP text.
• Made the optional coffee tip purchase easier to retry when unavailable. 1.1 Aug 26 1.0 Aug 21
About learnFORTH
The company that develops learnFORTH is John Kennedy. The latest version released by its developer is 1.5.
To install learnFORTH on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-14 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the learnFORTH as malware if the download link is broken.
How to install learnFORTH on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the learnFORTH is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After learnFORTH is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 1.5
posted on 2026-10-14
Version History Edited some lessons to be clearer.
Added more example programs.
Created a list of default Forth words and their definitions. 1.5 Sep 15 Animated the stack representation in the REPL. Looks neat! 1.4 Sep 3 Some more lesson refinements, and a nicer way of viewing the stack in the REPL to help you visualize what your code is doing. 1.3 Aug 30 Some more lesson refinements.
Example Forth programs to read, run and learn from.
Increased the smug sense of satisfaction you'll get from knowing Forth. 1.2 Aug 27 • Improved early stack lessons with clearer examples for ., OVER, ROT, -ROT, CELLS, and memory offsets.
• Exercise attempts now start from a clean interpreter state.
• Fixed exercise state, lesson formatting, REPL controls, history management, and HELP text.
• Made the optional coffee tip purchase easier to retry when unavailable. 1.1 Aug 26 1.0 Aug 21
Disclaimer
Official App Store Link
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