Privacy Policy

Last updated: July 12, 2026

Privacy at a glance

LocalLM Lab runs entirely on your own Mac. It uses Apple's on-device Foundation Models framework (Apple Intelligence) to generate responses directly on your Apple Silicon hardware. LocalLM Lab's developer, ThisBrain.AI, does not receive your prompts, responses, or any content you enter into the app. There is no cloud backend, no account, and no server operated by ThisBrain.AI that your data passes through.

Information processed on your device

When you use the Prompt Playground, your system prompts and inputs are sent directly to Apple's on-device Foundation Models, which run locally on your Mac. Nothing you type is sent off your device by LocalLM Lab.

When you use API Lab, LocalLM Lab runs a local, OpenAI-compatible API server on your own machine so other apps or scripts you run can talk to the on-device model. By default this server listens on localhost only. If you choose to expose it to your local network, requests still stay on your LAN and are never routed through ThisBrain.AI's infrastructure, because ThisBrain.AI does not operate any infrastructure that LocalLM Lab talks to.

Because generation happens on-device via Apple's Foundation Models framework, your prompts and outputs are subject to Apple's own on-device processing behavior rather than any third-party cloud AI provider.

API Lab access tokens

If you enable API Lab, LocalLM Lab generates a local access token used to authenticate requests to your local server. This token is stored locally on your Mac and is never transmitted to ThisBrain.AI. Regenerating the token immediately invalidates the previous one.

Request and response logging

Prompt Playground logs every run to a plain-text file on your Mac at ~/Library/Logs/LocalLM Lab/dev.log, including the system prompt, user input, and output. This happens by default and is not sent to ThisBrain.AI.

If you enable request logging in API Lab, each incoming request and response is appended to a plain-text file on your Mac at ~/Library/Logs/LocalLM Lab/api-requests.log. This is off by default, only writes when you turn it on, and is never sent to ThisBrain.AI.

Both log files stay on your device and can be deleted at any time using the in-app controls or by removing the files directly.

Information stored locally

LocalLM Lab stores non-secret settings locally on your computer, such as your chosen prompts, server configuration, and preferences. This data stays on your Mac and is not transmitted anywhere by LocalLM Lab.

Telemetry

LocalLM Lab does not collect usage analytics or telemetry.

Deleting local data

You can remove LocalLM Lab's local settings, saved prompts, API Lab tokens, and log files using the in-app controls, or by uninstalling the app.

Requirements

LocalLM Lab requires a Mac with Apple Silicon, macOS 26 or later, and Apple Intelligence enabled. Apple's own terms and privacy practices govern how the Foundation Models framework processes data on your device; please refer to Apple's documentation for details.

Contact

For privacy or support questions, contact neuron@thisbrain.ai.