A desktop OS for you and your AI.

◇ Local-first · AI-native

A desktop OS for you and your AI.

Brainstorm runs your apps, your data, and your AI on your own machine. Install what you need, keep every file on your disk, and let AI help — only with the parts you hand it.

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Local-first · No account required · See it in action ↓

• ### Apps, not features
The shell only hosts apps. Notes, Database, Files, Graph, a calendar, a code editor — add the ones you want, drop the rest, and update each on its own.
• ### Your data, your disk
Every document is a plain file in a folder you own. Sync is optional and end-to-end encrypted — the relay only ever sees scrambled bytes. There's no account to sign up for.
• ### AI you can govern
The shell sits between your apps and any AI. Use your own API key or a model that runs locally, and decide exactly what each app and agent is allowed to touch.























The shell It opens to a desktop Your apps sit in a launcher over a wallpaper you pick. The shell's whole job is to host them — it has no idea what a note or a task is. Those live inside the apps.



The shell It opens to a desktop



Database One place, every kind of thing



Notes Notes that link to everything



Tasks Projects, the way you work



Calendar Your week, from the same data



Contacts People, and how they connect



Graph See the shape of your work



Whiteboard Think on an infinite canvas



Bookmarks Save the web, tag it, find it



Journal A daily habit, built in



Agent AI that stays on your machine

Every app, fully described — capabilities and screenshots →

You and your agents, working from one place

Most tools bolt AI on top: a button in someone else's cloud, working on data you don't own, with no record of what it did. Brainstorm starts somewhere else.

The same ledger that decides what an app can reach decides what an agent can reach. Every grant is specific, logged, and easy to take back — and if the system can't verify a request, it simply says no.

Your data and your keys stay on your machine, so you can hand work to AI you'd never send to a stranger's server. That's the part no cloud tool can offer: your data encrypted, models on your hardware, and a trail of who did what.

Here today: the AI broker, provenance, and budgets. Agents with their own identity and history are on the roadmap below — not dressed up as if they've already shipped.

• 01

Apps you choose, not features bundled in.

Install Notes, Database, Files, Graph from us. Install third-party apps from the catalog or a URL. Uninstall what you don't use. The shell stays small.
• 02

Your data, your disk.

Every document is a file on your machine. Sync is optional and uses Yjs CRDTs. Export to standard formats anytime. No account required, ever.
• 03

AI when you want it, never when you don't.

The shell brokers every AI call. Bring your own provider key, or run the local model that ships with the shell. Per-app budgets cap runaway cost.
• 04

Customise without polluting the shared workspace.

Database views, dashboard layouts, shortcut bindings, theme — all personal by default. Explicit "share with team" elevates to org scope when you want it.
• 05

A real app SDK.

Sandboxed, capability-gated, with a stable contract. Build an app from inside Brainstorm with the Code app, and install it from a local package or a URL.
• 06

Designed in the open.

Every decision, trade-off and open question gets written down and argued through before it ships. The product is the result of those notes, not a marketing layer on top.

1. In the build

The shell and twenty apps

A sandboxed host with a capability ledger, the vault, and twenty first-party apps that all share one object space. 2. In the build

Local data, encrypted sync

Every document is a CRDT on your disk. Multi-device sync is optional and end-to-end encrypted — your keys never leave your devices. 3. Shipped

The AI broker

One path for every AI call — your key or a local model — with a record on every object and a budget on every app. 4. Out now

Public beta

A free, encrypted, multi-device core you can actually live in — available now for macOS, Windows, and Linux, with a one-click way to bring your existing notes across. 5. On it now

Agents as teammates

AI that has its own identity, its own permissions, and a history of what it did — an operating system for a team that runs on agents. 6. On the roadmap

A mobile companion

Your vault in your pocket — a read-and-capture app for iOS and Android that syncs over the same end-to-end encrypted channel, so notes you take on the go land in the same object space. 7. On the roadmap

An app marketplace

Build on the open SDK today, then discover, install, and publish third-party apps — each running in the same sandbox, under the same capability grants you control.
• ### Free
$0 forever The whole product, on your machine.

* All bundled apps, unlimited local storage * Sync over your own network — no server needed * Self-hosted relay and peer-to-peer sharing * Local AI, plus bring-your-own provider keys * Import and export everything — no lock-in Download

• ### Plus
Coming soon $4.99 / month $49.99 / year — two months free Your devices, talking seamlessly.

* Hosted end-to-end encrypted relay, up to 5 devices * 20 GB cloud attachments * Encrypted key backup and recovery * 90-day sync history

• ### Pro
Coming soon $14.99 / month $149.99 / year Headroom and priority for power users.

* Up to 15 devices, priority relay routing * 200 GB cloud attachments * $5 / month of bundled AI credits * 365-day sync history and priority support

• ### Team

* Everything in Pro, pooled across the team * Shared org spaces with role-based access * Admin tools and audit log * $10 / seat monthly AI credits

Enterprise

$39 / seat / month baseline — SSO (SAML / OIDC), SCIM provisioning, custom DPA, configurable audit retention, and an on-prem relay option. Volume discounts are published on the rate card, not negotiated in the dark.

Talk to us

Free is not a trial. Local persistence, every bundled app, peer-to-peer sync, self-hosting, your own AI keys, and full import/export stay free, forever.

Hosted plans open with the commercial release; listed prices are launch targets.

Want hosted sync the moment it opens?

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Own your tools again

Free, local-first, and yours. Download the public beta for macOS, Windows, or Linux.

Download Read the docs

No account required · Your vault is a folder you control · Free and open source under AGPL-3.0