Long Horizon

What it does

Your coding agent writes the feature — let it test it too. Long Horizon runs real browser tests and produces shareable execution reports with logs, screenshots, and network detail for confident feature delivery.

Automatically plan and run frontend tests in a real browser, discover issues, and fix them—with complete execution logs for review. Signed-in user completes purchase; confirmation renders with order id. The agent drafts the plan, writes the tests, and runs them in the browser. From your feature and repo context, the agent drafts what to test — core paths, edge cases, and failures. Signed-in user with items in cart completes purchase with a saved card; order confirmation renders. Checkout CTA stays disabled when the cart is empty; no network call to payment intent. Simulate card decline, surface inline error, allow user to change method and succeed. The agent writes tests in your project,…from longhorizon.dev

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