Manticore Software

LegacyAI allows older Apple computers to interact with AI services like OpenAI's ChatGPT.

LegacyAI works across 15 different Mac systems, from System 7 to 10.11 (El Capitan). A proxy server can also be configured to fully customise your experience. LegacyAI has allowed Macintosh computers from 1988 and onwards to communicate with ChatGPT, even before iOS had an official app for it.

LegacyAI is an efficient tool for anyone seeking an AI-powered personal assistant on their older Macintosh.


  • Allows you to converse with OpenAI's ChatGPT on Mac OS 7 - 10.11 (El Capitan)
  • Free to use but API access is dependent on donations
  • Save and load conversations for future reference
  • Change AI models to adapt to your needs
  • Optionally use your own proxy server and fully customise your experience
  • Customisable preferences


  • A Macintosh computer running Mac OS 7 - 10.11 (El Capitan)
  • A Motorola 68020 CPU or better
  • At least 1.6MB Ram
  • 565KB Disk Space


Running costs
While LegacyAI is completely free to use, it is dependent on funding for API use and proxy server running costs. If you find LegacyAI useful and are in a position to donate, please do so here.

You may also purchase a license to unlock extra features and support the project.

See the subscription page to access the latest GPT models.

Mac OS 7/8/9 was built before HTTPS was a standard protocol used for transferring information over the internet. This means that any transmissions you make on an older Macintosh are insecure. In order to enable Mac OS 7 - 9 usage, LegacyAI does not transmit information over HTTPS. Please ensure you understand this and do not use LegacyAI for sensitive subjects.

Special Thanks
Special thanks to Alex Robb for some tips while building this!

Bug/Feature Tracker

Download LegacyAI

LegacyAI (68k)

LegacyAI (68k) 2.1 (Macintosh System 7 - Mac OS 8.6)

Manticore Software

LegacyAI is 68k is built for Macintosh computers with a Motorola 68020 CPU or newer. It is not compatible with older CPUs.

LegacyAI (PPC)

LegacyAI (PPC) 2.1 (Mac OS 8.1 - Mac OS 9)

Manticore Software

LegacyAI PPC supports Macintosh computers running Mac OS 8.1 - Mac OS 9.2.2

LegacyAI (Universal Binary)

LegacyAI (Universal Binary) 2.1 (Mac OS X - Mac OS X 10.11 El Capitan)

Manticore Software

The Universal Binary supports both PowerPC and Intel Macs from system 10.0 (Cheetah) - 10.11 (El Capitan)