ACSLogo is a Logo Interpreter for macOS.
Logo is a popular language used to teach simple programming by guiding the progress of a ÔturtleÕ which moves around a graphics screen:
| The turtle in action |
A new version is available (March 2024) Ñ 1.6.2. This version will be required at some point for future versions of macOS, see Release Notes.
Simple commands can be used to make the turtle move in a straight line or change direction, and complex patterns can be built up from the simple commands using procedures and recursive techniques:
Graphics can be exported as TIFFs, JPGs, PNGs, PDFs or SVGs.
ACSLogo requires macOS. The current version, version 1.6.2, runs on Intel and Apple Silicon Macs.
Download
The download is a self-extracting archive (2M).
This release works with Apple Silicon Macs.
Right-click on the link and save it to disk:
This should automatically be mounted as a disk image. If not, double-click on it. Drag the enclosed folder to your Applications folder, or anywhere you like.
Double-click on the app to open it. You may get an error dialog saying that the app is not from the app store Ñ if so, go to Security and Privacy in System Preferences. Click on the Open anyway button.
Read ReadMe.rtf
Any problems, please send an e-mail to 
Other Stuff
Command Reference (PDF, 770K).
User Guide (PDF, 8.8M).
Previous version of ACSLogo (1.6.02).
Previous version of ACSLogo (1.5.1).
Earlier version of ACSLogo (1.5).
Earlier version (1.4f). Works with Tiger (10.4).
Earlier Version (1.4b) - works with Panther.
Example graphics: