LocalBrain AI

A private AI second brain that runs entirely on your iPhone. Chat, organize notes, and build your own knowledge base — your data never leaves the device.

LocalBrain is a fully offline, no-cloud personal knowledge base with an on-device AI knowledge-base assistant that helps you organize notes, answer questions, and rewrite ideas.

Design principles • Fully on-device inference: your notes and queries never leave the device • No server, no account, no subscription, no ads • No analytics, no usage tracking

Features • AI knowledge-base chat: ask in natural language, model answers only from what you've saved • Smart import: share URLs, PDFs, Word files to LocalBrain — content is automatically fetched and summarized • Linked knowledge-base pages: [[wikilinks]] automatically connect related notes into a graph

Built for hoarders who never organize • Just toss it in: share URLs, files, or thoughts directly into LocalBrain — no folders, no tags, no system to set up first • No more organizing: the AI does the filing — extracts key points, builds knowledge-base pages, links related concepts via [[wikilinks]] • Your knowledge graph grows itself: every new import auto-links to existing notes, surfacing related concepts you'd otherwise forget • Just ask LocalBrain: find anything in your knowledge base by chatting — no need to remember where you put it or what it said

Trusted for sensitive content • All data stays inside your iPhone sandbox — no server, no cloud sync, nowhere to leak from • On-device inference: your content is processed locally and never sent to any third-party cloud AI service • Use it for: private journals, password hints, client lists, draft financials, business strategy, product recipes

Requirements • iPhone 14 or newer (A16 Bionic) • 4 GB storage for the model • Wi-Fi recommended for first-launch model download (3.4 GB)

Privacy We do not collect personal data, do not upload analytics, do not send your queries to cloud AI services. All inference runs on your iPhone. See our privacy policy.