ACSLogo for macOS

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ACSLogo is a Logo Interpreter for macOS.

Logo is a popular language used to teach simple programming by guiding the progress of a ‘turtle’ which moves around a graphics screen:

The turtle in action

A new version is available (December 2020) — This version is required if you’re moving to macOS Big Sur, 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, requires Sierra (OS X 10.12) or above.




The download is a self-extracting archive (2M).

Please note that this release requires Sierra (OS X 10.12) or later.

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 — 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). This looks better in Preview than Acrobat Reader.

User Guide (PDF, 8.8M).

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.


Release notes

Logo Books

Logo Links

Example graphics:

Bitmap graphics

SVG graphics