# LongHorizon Harness (open-source AI desktop app)

> LongHorizon Harness is a free, open-source AI desktop app for Windows and macOS. The long-horizon computer-use harness. Run AI agents across desktop apps and the CLI for extended periods while preserving task state and making reliable progress on complex workflows. It has 1,684 GitHub stars and is released under the MIT license.

Give Claude Code, Codex, OpenCode, or DeepSeek Harness a goal once. Keep it working across desktop apps and the terminal for dozens of hours.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/AMAP-ML/LongHorizon-Harness |
| Platforms | macOS, Windows |
| Interface | desktop GUI |
| GitHub stars | 1,684 |
| License | MIT (open source) |
| Replaces | n/a |
| Language | Python |
| Website | https://lh-harness.pages.dev |
| Official | no |
| Category | AI desktop apps |
| Latest release | v0.1.7 (Aug 20, 2026) |
| Last commit | Aug 20, 2026 |

## Install

Download a build for your system from the project's releases (https://github.com/AMAP-ML/LongHorizon-Harness/releases) or website, or build it from source by following the README.

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Canonical page: https://appsgit.com/desktop-apps/longhorizon-harness
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