Mezair

Put your agents in motion.

Run Codex, Cursor, Devin and more from one desktop app. Bring your own subscriptions. Free and open source. Add hosted Sync & Mesh for £8.99/mo, or self-host it for free.

Download for MacView source

The Mac build is unsigned, so follow the install guide. Builds for Windows and Linux are on GitHub. Mezair is pronounced may-ZAIR.

The same Mezair thread with the work expanded: read src/lib/retry.ts, searched for withRetry, edited test/retry.test.ts, ran pnpm test -- retry with one failure, edited src/lib/retry.ts, then ran pnpm test with 14 passing.

Bring your own account

  • Codex
  • Cursor
  • Devin
  • OpenAI
  • Azure OpenAI
  • LLMGateway

What you can ask it to do

  1. Fix a bug while you work on something else

    Describe it. The agent writes a failing test, fixes the bug and runs the suite.

    pnpm test -- retryAgent workflows

    The same Mezair thread with the work expanded: read src/lib/retry.ts, searched for withRetry, edited test/retry.test.ts, ran pnpm test -- retry with one failure, edited src/lib/retry.ts, then ran pnpm test with 14 passing.

  2. Review your changes before you commit

    Get a review in the thread, with findings you can send straight back to the agent.

    Review my uncommitted changes.Change review

    An inline Review surface in a Mezair thread for a working tree: Blocked, with three risks and eight findings, the change explained in three chapters, and findings grouped by severity with Open actions.

  3. Audit a repository you're new to

    Security and dependency issues, each with a file and line.

    Run a security audit of this repo.Security and review

    A Findings surface from a security audit: one critical, one high, two medium and one low finding, each with a file and line, plus Ask agent to fix top 5.

  4. Find out why CI is slow

    See the pipeline as a graph, with the slow and failing steps marked.

    Why is CI slow?Assurance tools

    A Pipeline surface for CI: workflow, install, lint, test, build and deploy jobs as a graph, with the failing test job and an uncached install called out.

  5. Turn labelled issues into merged pull requests

    A software factory works through labelled GitHub issues and stops for approval where you want it to.

    Beta through 30 November 2026Software factories

    Mezair Factories view. A factory line takes labelled GitHub issues through stations from intake to merge; runs are shown at each station with live, waiting, needs approval and blocked states.

  6. Run a job on another of your machines

    Send a job to your desktop or a server. It runs there and streams back.

    start-session → studio-macMesh jobs

    Mesh jobs in Settings. A start-session job runs on studio-mac with its live attempt stream: checkout verified, pnpm install, a failing test, an edit and 14 passing tests, with a marked gap in the stream. Other jobs show Needs approval, Completed, Lost contact and Stopping.

Use Mezair on more than one machine

Sync keeps your setup the same on every machine, end-to-end encrypted. Mesh runs jobs across them and moves sessions between them.

How Sync & Mesh workRun your own backend

Free to self-host, £8.99 a month hosted. Hosting is invite-only until 30 November 2026.

Sync: Dana's MacBook saves an edit to the Acme workspace and encrypts it with AES-256-GCM and the account key. The Sync backend stores the ciphertext and can read only metadata. studio-mac and build-box download the change and decrypt it.

  1. Saved locally
  2. Encrypted on the device
  3. Stored as ciphertext
  4. Pulled by your devices
  5. Decrypted and applied

The devices and commits are examples. The states and their order match the app's protocol.

What else is in the app

Agents
Codex, Cursor, Devin, OpenAI, Azure OpenAI, LLMGateway.Your own accounts. Providers bill you directly.
Git
Commit, open a pull request or undo a turn from the thread.Background work runs in its own worktree.
Review
Diffs, test results and security, dependency and pipeline checks appear in the thread.
Plans
Work items with acceptance criteria, risks and follow-ups attached.
Automations
Scheduled checks and multi-agent workflows, each in its own working copy.
Software factories
Labelled GitHub issue to confirmed merge, under a policy you activate.Beta through 30 November 2026.
Companions
Approve a step or reply from iPhone, Apple Watch, Raycast or the menu bar.

Full Desktop feature list

Keyboard shortcuts and developer tools

Works with your editor, terminal and Git.

Agent tools
Agents can ask you questions and post reviews and diagrams in the thread.
No account
Everything stays in a local database. Crash reporting is off by default.
Custom shortcuts
Rebind any shortcut in Settings.
Source code
The app, the backend and this site are MIT-licensed on GitHub.

Shortcuts and composer reference

KeyboardmacOS shortcuts. You can change them.
Command palette
⌘K
New chat thread
⌘⇧N
Toggle terminal
⌘`
Guide a running agent
⌘↵
Commands in the composer
/
Skills in the composer
$

Other Mezair tools

Open source, and none of them need Desktop.

  • RegistryBeta

    An npm gateway that checks packages before they reach you.

    npm config set registry http://localhost:4873

    DocsSource

  • Node BaseBeta

    A Node container for installing code you don't trust yet.

    mezair-npm-ci-safe

    DocsSource

  • CloudBeta

    Build an app backend in TypeScript, then choose where it runs.

    mezair-cloud check --json

    DocsSource

The source is on GitHub

One MIT-licensed repo for everything.

mezair-stack on GitHubHow to contribute
# clone the monorepo
$ git clone https://github.com/anthonyhumphreys/mezair
$ cd mezair
$ node .github/scripts/prepare-desktop-clis.mjs
$ cd mezair-app

# each project installs on its own
$ pnpm install
$ pnpm dev
Commands to clone the Mezair repository and start Mezair Desktop in development mode.

Try it on a repository you know well

No sign-up needed.

Download for MacRead the install guide