Granite
Encrypted second brain your AI tools can actually use
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Granite is a Markdown second brain, encrypted with a separate key for every vault and synced across phone, tablet, desktop and web. A built-in MCP server lets Claude, ChatGPT and Cursor search, read and update your notes, only in the vaults you allow, with answers that cite the exact note. Wikilinks, backlinks, graph, offline search, live co-editing, and SSO, SCIM and audit logs for teams. Never used to train AI. Free forever; Pro $3.99/mo, no AI surcharge.
PH · launched Oct 18, 2026 · 1 upvote (top 67%) · 0 views
Niche: knowledge management software · 95 launches, 7 in the last 7 days ▲ +17% · Explore this niche →
Category and tags
- Horizontal
- Data infrastructure
- Prosumer
- AI feature
- Commercial product
- Android
- Notes
- Privacy
- Artificial Intelligence
Visit website ↗ Source listing ↗
More like this: all 95 launches in knowledge management software →
Could you build this?
Partial The Markdown editor, wikilinks, and MCP server are vibe-codeable, but correct per-vault end-to-end encryption and conflict-free multi-device sync are security-critical pieces that need careful engineering.
What it would actually take: A realistic stack is a local-first Markdown store (SQLite or files), a CRDT-based sync layer such as Automerge or Yjs, and per-vault keys derived and managed with audited libraries like libsodium. The MCP server would expose scoped read/write tools per vault. The hard parts are key management and recovery without the server seeing plaintext, and sync correctness across platforms, which benefits from security and distributed-systems expertise.
Competitors
Other products that read as similar to this one : 29 launches clear the similarity bar, closest 8 shown.
Attention rank: #20 of 30 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 223 days after the earliest competitor.
- mdai · ph · 2026-11-01 · 2 upvotes · similarity 0.39
- Second Brain for AI v2 · ph · 2026-07-12 · 263 upvotes · similarity 0.39
- Second Brain for Teams · ph · 2026-09-06 · 5 upvotes · similarity 0.39
- Northern Logic · ph · 2026-09-10 · 1 upvotes · similarity 0.38
- keyshroud · ph · 2026-10-20 · 1 upvotes · similarity 0.37
- Second Brain for AI · ph · 2026-05-31 · 284 upvotes · similarity 0.35
- Memento · ph · 2026-10-12 · 1 upvotes · similarity 0.34
- CleverReply · ph · 2026-10-05 · 2 upvotes · similarity 0.34
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.