The lightweight IDE for the coding agents you already pay for.
Open Free Max drives the official Claude Code, Codex, OpenCode, Gemini and Vibe CLIs interactively — all from one Mission Control screen, on your subscription, never your API bill. No Electron. No extension host. Sessions that never get lost.
Free · v1.0.0 · Windows (.exe) · macOS (.dmg)
Installers aren't code-signed yet. On Windows, click
More info → Run anyway if SmartScreen warns
you. On macOS, right-click the app and choose Open,
or run xattr -dr com.apple.quarantine.
Open Free Max uses up to 200× less memory than Antigravity, Cursor or Visual Studio. No bundled Chromium, no extension host — just your OS WebView and a native Rust core.
Not another Electron behemoth. Not a chatbot wrapper around one API. A thin native shell over the official agent CLIs — with the editor, tabs and screenshot workflow you actually want on top.
Every agent you're running, on one screen.
Spin up as many CLI sessions as you want — across projects and providers — and watch them all from a single control room. Each pane is its own live PTY: glance at what every agent is doing, jump in to steer one, and let the rest keep working.
- Unlimited parallel sessions — Claude, Codex, OpenCode, Gemini, Vibe, side by side
- One glance shows what's running, idle or done across every project
- Click any pane to take over its prompt — the whole layout is restored next launch
Your agent. Your plan. No surprise API meter.
Providers split usage in two: interactive — a human typing and reading — runs on your normal subscription. Programmatic — SDKs, headless runs, third-party app protocols — drains a capped credit pool and then bills at API rates.
What OFM does
- Drives the official CLI in interactive mode (human in the loop)
- Renders its real stdin/stdout through an embedded PTY
- Leaves auth entirely to the official binary — keys never leave it
What OFM refuses
- The Agent SDK and headless
-pruns - ACP / third-party app protocols (metered as programmatic)
- Ever handling your tokens, keys or session auth
Everything an agent IDE should be — and nothing it shouldn't.
Up to 200× lighter
Built on Tauri — your OS WebView and a native Rust core. No bundled Chromium, no VS Code extension host. Up to 200× less RAM than Antigravity, Cursor or Visual Studio, even with several agents running.
On your subscription, not your API bill
OFM drives the official CLIs in interactive mode — a human in the loop. Your usage stays on the Max / Pro plan you already pay for, never the metered programmatic path.
Sessions that survive a restart
Close the app, reopen it, and every agent tab replays its full conversation. OFM never owns the transcript store — so a conversation is impossible to lose or corrupt.
First-class screenshot workflow
Paste or drop any number of images into a prompt. OFM writes them to disk and shows thumbnails — you never type a file path, and clipboard paste just works on native Windows.
Mission Control
Pilot as many agent CLIs as you want from a single screen — every session live in its own PTY, across projects and providers. Steer one, let the rest run.
Native WSL2, no extension
Open a project living inside a WSL distro and the agent runs in Linux — node, git and the CLI from your distro, the right PATH guaranteed. Nothing to install on the IDE side.
Conversations you can't lose
The agent CLI already stores every transcript on disk. OFM keeps only a tiny map of which sessions were open — and rebuilds it from disk if it's ever missing. That's the bug other tools can't fix, fixed by design.
Screenshots, the way you work
Hit Ctrl+V or drag images straight into the prompt. OFM saves each one, shows a thumbnail chip, and injects the real paths at send time. Drop ten — no path-typing, no silent clipboard failures.
Works with the official CLIs.
One provider adapter, the agents you already use. No lock-in.
Claude Code
Anthropic — session resume, names, fork
Codex
OpenAI — interactive CLI
OpenCode
Open source agent CLI
Gemini
Google — interactive CLI
Vibe
Mistral — interactive CLI
Thin where it counts.
Open Free Max
Questions
How do I install it? +
Download the installer for your OS and run it — a native .msi on Windows, a .dmg on macOS (Apple Silicon & Intel). No package manager, no build step, no command line required.
Do I need an API key? +
No. OFM never touches your tokens, keys or auth. It launches the official agent CLI, which handles its own subscription login. You sign in once where you already do.
How does billing actually stay on my subscription? +
OFM only ever drives the official CLI in interactive mode (a real human typing and reading). It deliberately avoids the SDK, headless `-p` and ACP paths that are billed against the metered programmatic credit pool.
Which platforms are supported? +
Windows (with native WSL2 project support) and macOS — the Tauri core covers both with a small, native footprint.
Why not just use Cursor or a VS Code fork? +
Those embed Chromium plus the VS Code extension host, which is heavy, and they re-implement session storage — the place where agent conversations get lost. OFM stays thin and leans on the CLI's own durable store.
Ship with your agents — without shipping your wallet.
A lightweight native IDE for Windows and macOS. Download it and drive every agent you already pay for.
Free · v1.0.0 · Windows (.exe) · macOS (.dmg)
Installers aren't code-signed yet. On Windows, click
More info → Run anyway if SmartScreen warns
you. On macOS, right-click the app and choose Open,
or run xattr -dr com.apple.quarantine.