Otto

Otto is a personal operating system for the AI agents that work for you. It's a native macOS app: Home is where your day starts (a daily brief, pinned cards and a composer), and Chat holds your sessions, bots and teams beside Documents, Dashboards, Automations and a built-in browser. You bring your own agents (Claude Code, Codex, Cursor, Grok, Hermes and others) and your own accounts. Otto runs them locally and keeps your files, memory and credentials on your Mac.

• Website and downloads: https://openotto.io
• Changelog: CHANGELOG.md

Features

• Home with a daily brief and pinned cards, and Chat for sessions, bots and teams
• Documents, Dashboards, Automations and a built-in browser your agents can use
• Chat sessions and saved bots with their own memory, teams and subagents
• Provider CLIs run in real PTYs, with model and account switching per agent
• One typed tool registry exposed to agents over MCP and to you through ottoctl
• Separate Work and Personal profiles, each with its own memory and bots
• Optional realtime voice control, using your own xAI key
• A mobile companion app that pairs with your Mac

Build from source

You need macOS 15 or newer and Xcode 26 or newer (Swift 6.2). You don't need an Apple Developer account.

git clone https://github.com/maxtrigify/Otto.git
cd Otto
swift run Otto

For day-to-day development, install Otto Dev, an app in ~/Applications that rebuilds and relaunches itself when sources change:

scripts/dev-app.sh reload

It creates a local self-signed signing identity the first time it runs. Build logs go to ~/Library/Logs/Otto/dev-reloader.log.

Test

swift build
swift test --no-parallel
xcrun swift-format lint --strict --recursive Sources Tests Package.swift
swift build -c release -Xswiftc -warnings-as-errors

The suite runs serially because several suites use process-wide PTY and child-process facilities. It never makes paid voice or model calls. Provider launch tests only run when the matching CLI (Claude Code, Codex, Cursor, Kimi, OpenCode, Grok or Hermes) is installed.

Repository layout

Path	What's there
Sources/OttoApp	The macOS app (SwiftUI)
Sources/OttoCore, OttoModels, OttoPersistence	Canvas model, commands and SQLite persistence
Sources/OttoRuntime, OttoHarness	Agent supervision and provider harnesses
Sources/OttoMCP, otto-mcp, ottoctl	MCP server and command-line control
Sources/ottod	Headless host daemon
Apps/OttoMobileApp	iOS companion app
Web	Bundled diagram runtimes
docs/ADR	Architecture decision records
docs/THREAT_MODEL.md	Security model

Privacy and security

Otto has no public inbound port. Credentials are stored only in the macOS Keychain, and content from tools and the web is treated as data, never as authorization. See SECURITY.md to report a vulnerability.

Contributing

See CONTRIBUTING.md. Please follow the code of conduct.

License

Apache License 2.0. See LICENSE and NOTICE. The Otto name and logo are covered by the trademark policy. Third-party components are listed in packaging/THIRD_PARTY_NOTICES.md.