Retro is a concatenative programming language with roots in Forth. Designed to be compact, learnable, and easy to adapt to specific needs, it has been developed and refined through continual use by a small community over more than a decade.

Forth is a stack based programming language created in the late 1960's by Chuck Moore. Over the intervening decades it has evolved through use, with many dialects along the way.

The Retro dialect was created in the late 1990's, and has been continually developed and supported for over 15 years. It is a structured, imperative stack-based language with modern facilities including quotations and reflection.

It features:

- listener: a quick interaction mode
- code editor supporting multiple projects
- load and save the current session
- console output display
- dictionary browser with quick reference
- browse values on stack
- integrated documentation
- preloaded libraries for common data types and algorithms
- debugger
- split screen & slide over support

What’s New

Version 2017.10

This update is small; it adds support for accessing & managing your projects via the Files app on iOS 11 and makes a few small tweaks to the color choices in the user interface to improve readability.

Ratings and Reviews

4.0 out of 5
1 Rating

1 Rating


Charles Childers
2.2 MB

Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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