Fullmoon is a free app that chats with small open language models running entirely on Apple devices, with no account and nothing sent to the cloud. It suits iPhone, iPad, and Mac owners who want a private AI chatbot that keeps working offline.[1][2]
Quick verdict
Apple-device owners who want AI chat without sending data to a cloud service benefit most from Fullmoon. Its strength is chatting with quantized Llama 3.2 and DeepSeek distilled models that run entirely on-device through Apple's MLX framework and work fully offline. The constraint is Apple-only hardware with a handful of small mobile-sized models whose answers trail larger cloud assistants, so anyone needing top-tier reasoning or non-Apple support should choose something else. If privacy and offline use on an iPhone, iPad, or Mac decide the choice, use Fullmoon; if maximum capability across devices matters more, use a cloud assistant such as ChatGPT.[1][2][3]
Key features
Private on-device LLM chat Chat with large language models directly on the device: the official site describes local intelligence with nothing sent to the cloud and no account required.[1][2]
Fully offline once downloaded The app works fully offline without internet once a model is downloaded, so conversations continue with no connection.[1][2]
Quantized Llama 3.2 models It ships with quantized Llama 3.2 model variants sized between 0.7 and 1.9 GB, chosen to fit mobile-sized hardware.[1][2]
DeepSeek R1 distilled models DeepSeek R1 distilled models are offered alongside Llama in the same small downloadable range.[1][2]
Apple silicon via MLX and Metal 3 Models are tuned for Apple silicon through Apple's MLX array framework with Metal 3 graphics acceleration.[1][2]
Four Apple platforms One app covers iPhone, iPad, Mac, and Apple Vision across iOS, iPadOS, macOS, and visionOS.[1][2]
Personalization with on-device history Theme, fonts, and the system prompt are adjustable, and chat history stays stored on the device.[1][2]
Shortcuts actions Apple Shortcuts actions feed local model output into other workflows on the user's device.[1][2]
Who will love it
Apple-device owners who want AI chat without sending data to a cloud service: on-device inference keeps every conversation local.[1][2]
People who need a chatbot that keeps working with no internet connection: full offline use after a model download covers travel and dead zones.[1][2]
Anyone trying small open models tuned for Apple silicon hardware: the curated Llama and DeepSeek downloads make local experimentation a store install.[1][2]
Who should avoid it
Anyone outside Apple hardware: the app runs only on iPhone, iPad, Mac, and Apple Vision, with no Android, Windows, Linux, or web path documented.[1][2]
Users needing top-tier reasoning or broad knowledge: model choice is limited to a handful of small mobile-sized models whose answers trail larger cloud assistants.[1][2]
Teams needing support contracts or a managed service: no enterprise support or hosted offering is documented, with help coming from the site and the public repository.[1][2][3]
Alternatives and compatibility
ChatGPT is the cloud-hosted counterpart for heavier work: it serves chat, work, and coding from the cloud in one place, while Fullmoon keeps lighter chat local and offline on Apple devices.[1][2]
A TestFlight program carries the latest features and models ahead of App Store releases for users who want the newest builds.[1]
Distribution is free on the App Store and open source under MIT from Mainframe Computer, with no paid tier or account documented.[1][2][3]
Questions worth asking
What is the best Fullmoon alternative for non-technical users?
Is Fullmoon really no-code?
How much does Fullmoon cost per month?
Sources and editorial review
Source research. Reviewed on October 9, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.
We have not run or tested this product.
- Fullmoon official site
official · Observed October 5, 2026
Official product site: local-intelligence positioning, fully offline private chat, Apple silicon via Swift MLX and Metal 3, iOS/iPadOS/macOS/visionOS, Llama 3.2 and DeepSeek R1 distilled models 0.7-1.9 GB, themes/fonts/system prompt, Shortcuts actions, TestFlight builds, free and open-source positioning by Mainframe.
- mainframecomputer/fullmoon-ios repository
official · Observed October 5, 2026
Vendor repository page: mainframecomputer/fullmoon-ios described as chat with private and local large language models.
- fullmoon-ios README
official · Observed October 5, 2026
Vendor README: iOS app for chatting with local LLMs optimized for Apple silicon on iPhone, iPad, and Mac, with locally saved chat history, appearance customization, supported Llama 3.2 and DeepSeek models, and credit to Apple's MLX Swift.
- fullmoon-ios LICENSE
official · Observed October 5, 2026
Vendor license file: MIT permission grant and warranty disclaimer attributed to Mainframe Computer, Inc., copyright 2024.
- Fullmoon App Store listing
official · Observed October 5, 2026
Vendor App Store listing: Fullmoon local intelligence, Free by Mainframe Computer, Inc. for iPhone, iPad, Mac, and Apple Vision; fully offline private on-device chat with DeepSeek R1 and Llama models, personalization, Shortcuts, free open-source positioning.
- ChatGPT overview
official · Observed October 5, 2026
Vendor overview page: OpenAI cloud assistant for chatting, working, and coding in one place, with apps, downloads, and pricing tiers.