fullmoon

fullmoon is a local intelligence application developed by Mainframe that allows users to chat with large language models on their local devices. It supports full offline operation with no need for an internet connection, optimizes model performance for Apple Silicon chips, and offers personalized theme, font, and system prompt adjustments. As a free, open-source application that prioritizes privacy, it provides a simple and secure way to use language models for communication and creativity. It is compatible with iOS, iPadOS, macOS, and visionOS.

- Chat with a private local language model

- Run completely offline without a connection

- Customize themes, fonts, and system prompts

- Test and optimize model apps locally

- Get new features and models through TestFlight

- Developers testing language model applications locally

- Researchers working without internet access

- Content creators who want offline generation

- Privacy-focused Apple device users

On-device models are smaller than large cloud services, so answers can be less capable and slower, and offline use means no live data. The free and open-source status can change, so check the current terms before you rely on it. The app mainly targets Apple platforms, so Android and Windows users are not covered. Local models also take up device storage, so check space before installing larger ones. Behavior may vary across browsers and devices, so test before production use and consult the help docs if errors appear. Features and interface details may change between versions, so review the latest notes on the page before you start. Save a backup of the original file before large batch jobs, and keep an exported copy of key results in case the page or service becomes temporarily unavailable.