Before Alex has coffee, Pio writes first: three meetings, two letters worth reading, the weather in Lisbon and the dentist not to forget. Then a nudge: leave at 12:30 for lunch?
Open source · runs on your computer
They sort your mail, write letters you approve with one tap, work in a browser and learn by watching you. On your own computers, with the subscriptions you already pay for, under your control.
Open source · Apache-2.0 · iPhone soon in TestFlight
What the team can do
Every clip here is the real app, recorded from the demo above.
A team, not a chatbot
Write the way you would to a capable assistant. Pio answers the quick things at once and hands everything with steps to the right teammate. You see a line per task, keep talking, and each result comes back as a reply to the request that started it.
Mail and calendar
Ada goes through your mail while you watch: what matters, what can wait, what needs paying. Replies are drafted before you ask, and meetings land in your calendar with the invites sent.
Your yes
Letters, bookings, pushes and payments stop at a card in the chat. One tap allows it once; “always allow” makes a rule for that one address or site, up to an amount. Never a blank cheque.
Teach mode
Do the chore yourself in the agents’ browser and talk as you go. The agent writes down your steps, your words and what you highlighted, asks what it may press without you and up to what amount, and from then on does it when asked, or every Friday.
Proactive
A morning brief with your meetings, the letters that matter and the weather. Reminders, schedules and page watchers run in the background and decide for themselves: stay quiet, add to the digest, ping you or ask.
Security
A phishing mail tells the agent to forward your invoices. It doesn’t take orders from letters, and the system wouldn’t let it anyway: after outside content, every new recipient needs your yes. Keys go into a vault; the model only ever sees vault:// references.
Integrations
“Connect my Notion.” The card comes into the chat, you sign in once, and the whole team can use it. Gmail, Calendar, Slack, GitHub, Linear, Notion, Figma and two dozen more, plus anything that speaks MCP.
Pages
Some answers deserve more than a message. Ask for a weekend plan, a comparison or a dashboard, and an agent builds a real interactive page, with the route, places, prices, weather and photos, that opens right in the app.
Channels
“Every morning, collect news about AI and electric cars.” An agent becomes the editor: it reads the sources, keeps only what changes something and posts the gist, with the numbers and a big picture.
Your computers
Agents think with the Claude Code and Codex subscriptions you already pay for, with API keys as a backup. When one hits its limit, the work moves on to the next and comes back later. Other computers join as machines: a laptop for code, a server that never sleeps.
When a subscription runs out
Claude Code
your subscription
Codex
your subscription
API key
the backup
The agent comes back to Claude Code as soon as the limit resets.
Your machines
Mac mini at home
the hub: chats, memory, vault
MacBook Pro
where Bit writes code
Server
always on, takes over
How it works
Claude Code and Codex run on the plans you already pay for. Anthropic, OpenAI, OpenRouter or any OpenAI-compatible server step in as fallbacks: when a plan hits its limit, the agent moves on and comes back once it resets.
An app for macOS and Windows, or one Docker image for a server. Other computers join as machines, and one private link reaches your hub from your phone or any browser.
Chats, memory, files and the vault live on your machine. Agents are markdown files you can read. The whole thing is open source under Apache-2.0.
Security
An agent that reads your mail must never be one letter away from leaking it. Every step it takes goes through the same five layers.
Passwords and keys are encrypted with XChaCha20-Poly1305; the model only sees vault:// references.
Actions that reach outside wait for your yes. After reading untrusted content, new recipients ask again.
Brains and plugins run as separate users with their own folders, apart from the hub.
All their traffic goes through a filter with allowlists, so a prompt cannot open the door to any site.
Every call, decision and vault access lands in a log chained by hashes: tampering shows.
// what the model sees gmail_send({ to: "anna@studio-north.example", token: "vault://gmail" }) // → waits for your yes · audit entry #4127 · sha256 9f2c…e1a0
Integrations
Ask in the chat and the card does the rest. Anything with an MCP server connects too.
Gmail
Google Calendar
Slack
GitHub
Notion
Linear
Telegram
Google Drive
Google Docs
Google Sheets
Outlook
Teams
Zoom
Google Meet
Jira
Trello
Figma
Dropbox
OneDrive
Box
Calendly
Google Tasks
HubSpot
Salesforce
LinkedIn
YouTube
RedditiPhoneSoon
Your agents, every card and every task on the phone. Approvals need Face ID, and nothing runs on the phone itself: it talks to your hub.
Install
Everything it needs comes with it: no Node.js, Docker or WSL on your desktop.
macOS 13.5 or later, Apple silicon and Intel. Not signed yet: if macOS refuses, choose Open Anyway in Privacy & Security.