ExtraBrain
Yanbo Gao
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About this app
ExtraBrain is your on-device second brain — capture, import, and recall personal knowledge without uploading your content. **Remember** • Chat with an on-device assistant, then summarize & save key points • Import TXT, Markdown, PDF, and DOCX into a local memory library • Browse and filter memories anytime **Recall** • Ask in natural language — vector search retrieves local hits first • On-device RAG streams an answer from your own memories • Search and inference stay on this device and never upload content **Private by design** • Memories, embeddings, and chat stay on your iPhone by default • Sign in with Apple only for trial / Pro entitlement • Delete your account anytime in Settings **Pro** • Free local trial for recall search • ExtraBrain Pro Monthly unlocks unlimited recall after the trial • Payment charged to your Apple ID; cancel anytime in Apple ID → Subscriptions Generated answers can be wrong — verify important facts.
What's new
Version 1.1.0 · Nov 6, 2026
What's new in 1.1.0 • Smaller App Store download — the on-device AI model (~1.1 GB) is fetched from Hugging Face the first time you use chat or recall, then stays on your iPhone for offline use • Clear download progress, plus Settings controls to download or remove the model • Smoother on-device chat and memory recall once the model is ready Privacy tip: after the one-time download, inference stays on device by default.