AI answers you can actually trust.
Altretta is your private second brain: your notes and your code in one signed graph. Ask anything and every answer cites the exact source it came from — the decision, the note, or the function — without anything leaving your computer.
When was the migration approved?
The migration was approved on March 12, with a budget of €48.000.
Every answer, with its proof
In brief
Altretta is a private, local-first notes app: your notes and your code are your own Markdown files, and every AI answer cites the exact source it came from, with a signed history.
- Your files
- Markdown on your machine, no silo
- Your own AI
- Connect your model over MCP
- Everything leaves proof
- Signed, reversible history
- Available on
- macOS · Windows · Linux · free
Knowledge deserves something better.
Your notes are trapped in someone else's app
Proprietary databases, closed formats, and syncs that disappear one day. Your knowledge should be yours, forever.
AI answers without proof
Assistants hallucinate, mix sources, and you can't verify where each claim came from. Without evidence, there's no trust.
Team knowledge stays siloed
Fragmented wikis, permissions impossible to revoke, and sensitive data exposed to third parties. Sharing shouldn't mean losing control.
Your notes stay yours
Every note is an ordinary file on your computer. No lock-in, no format you can't open. Move it, back it up, or leave Altretta anytime — your knowledge comes with you.
It connects the dots you'd miss
Altretta links related notes automatically, surfacing the idea from months ago you forgot you wrote — all on your machine, nothing uploaded.
See the shape of everything you know
One click turns your notes into a world you can walk through. Folders become floors, hidden connections rise to the surface, and the shape of your thinking finally comes into view.
Understand your whole project — what you write and what you code.
Altretta reads your repository and maps it as a signed map: every symbol, how they call each other, and the decision that governs each one. So your AI doesn't just know your notes — it understands your code and how to change it without breaking anything.
Connect your AI. On your terms.
Bring the AI you already use — ChatGPT, Claude, Cursor — to your notes with your own subscription. You decide what it sees, and everything it does is signed and can be undone.
An encrypted, verifiable, revocable team brain.
Share knowledge without giving up control. End-to-end encryption, access you revoke in an instant, and a provable history.
Fewer tokens, by design
Altretta plugs into your AI over MCP and, powered by AIngle (its semantic engine), gives the model only the notes that matter, grounded and cited. Your AI works from the relevant context instead of your whole vault, so it spends fewer tokens and you stop re-pasting to explain yourself.
| Query | Without Altretta | With Altretta | Savings |
|---|---|---|---|
| Average per query | 22,530 | 1,262 | 94.4% |
| 8-query conversation | 811,085 | 44,759 | 94.5% |
Measured on the standard Studio Ghibli demo vault (43 notes): the full vault pasted as context vs the cited passages Altretta serves over MCP with its real engine. Input tokens; the ratio is stable across tokenizers. Reproducible with the published protocol.
The savings come from connecting your AI to the Altretta skill over MCP: it gets only the cited passages that matter, not your whole vault. Reproduce it yourself with the Studio Ghibli demo vault.
Get the Altretta skill
Extend it with skills & plugins from the Apilium Hub.
hub.apilium.com
From note to verifiable knowledge.
Write in Markdown
Take notes as always. Every idea is saved as a file you own on your disk.
Altretta links it all
It connects related notes and keeps a signed history of every change — all on your computer.
Connect your AI in a click
Plug in the AI you already pay for. It reads your notes; you choose what it can see.
Ask and verify
Get answers that quote your notes, with a confidence score you can check for yourself.
Start free. Pay only when you grow.
The app on your computer is free forever. Paid plans add syncing across your devices, publishing verifiable pages, and the encrypted team brain.
- The full desktop app
- Notes, graph, Bases & Canvas
- Use the AI you already pay for
- Answers grounded in your notes
- Sync one folder via your own cloud
- Sync across all your devices
- Publish pages others can verify
- Longer version history
- Import from Notion & Confluence
- Priority support
- Shared encrypted team vault
- Add or remove people in a click
- Encrypted sync across the team
- Roles & team dashboard
- See who wrote what
- Everything in Team
- Independent, auditable verification
- Single sign-on (SSO)
- Signed audit export
- SLA · Data Processing Agreement (DPA)
- ✓Free foreverThe local app and your notes are yours, offline, even if you never pay.
- ✓No lock-inEverything is standard Markdown files. Leave whenever you want, with your knowledge.
- ✓Cancel anytimeIndividual plans are month-to-month; team plans renew yearly. Managed from your portal.
Prices in EUR · VAT not included · subscription managed at my.apilium.com
Available today for your platform.
macOS universal (Intel + Apple Silicon) · Windows x64 · Linux AppImage/deb
Common questions.
Do I truly own my notes?
Yes. Every note is a standard Markdown file on your disk. Open it with any editor, back it up, or leave Altretta whenever you want: your knowledge stays with you.
Why pay if the app is free?
The desktop app and answers grounded in your notes are free forever. Paid plans add syncing across your devices, publishing pages others can verify, and the encrypted team brain. If you use a single device on your own, Free is genuinely all you need.
How can I trust the AI's answers?
Every answer quotes the exact notes it came from, with citations and a confidence score. If a claim isn't backed by your notes, Altretta tells you instead of making things up.
Do I need to be technical to connect my AI?
No. Altretta detects the AI apps you already have — like Claude, Cursor or VS Code — and connects them in one click. No config files, no keys to paste, and you choose which folders the AI can see.
Do I need to pay for AI separately?
Altretta is a pure memory layer: it doesn't include its own LLM. You connect your preferred model via MCP with your own subscription, so you use the AI you already pay for and keep control of your keys.
Can I bring my existing notes?
Yes. Altretta reads ordinary Markdown, so your current notes folder works as-is. Pro adds one-click import from Notion and Confluence.
How does the encrypted team brain work?
You share an end-to-end encrypted vault. Access is granular and revocable: when you remove someone, keys rotate and they can no longer read the content. Nothing is exposed to third parties.
Which platforms does it support?
Altretta is available today for macOS (Apple Silicon and Intel), Windows, and Linux. Downloads always point to the latest published version.
Take control of your knowledge.
Private, offline, and verifiable. Your notes, your AI, your rules.