jberthom

Thanks! Yeah Claude Code’s native browser is getting better. ProofShot is agent-agnostic though — works with Cursor, Codex, any agent that can run shell commands. And the proof bundle you get at the end (viewer.html with video + timeline + errors) is what I actually review, not the raw screenshots.

yep adding soon, agree it is the most recurring question

Thanks! Web only for now, runs headless Chromium. Desktop is the #1 request, likely through accessibility APIs or OS-level screenshots. On the roadmap.

Web only for now since it runs headless Chromium. For Flutter web builds it’d work, but native Flutter apps would need emulator integration which is on the roadmap. Feel free to open an issue on the repo.

Fair point, clearly the first question everyone has. Will add a comparison section to the README.

ProofShot isn’t a Playwright alternative, it’s built on agent-browser (from Vercel Labs), which is a different runtime. The value isn’t “can control a browser” — playwright does that fine, and in fact agent-browser is built on top of Playwright, hence so is ProofShot :) The value is bundling video + screenshots + console errors + server logs + action timeline into a single viewer.html and uploading it to the PR. That’s what saves me review time. If your workflow doesn’t need that bundle, playwright-cli works great.

Web only for now. It runs headless Chromium under the hood. Desktop and mobile are the #1 request. Mobile path would be iOS Simulator or Android emulator integration. Desktop would need accessibility APIs or OS-level screenshot capture. It’s on the roadmap. Feel free to leave an issue on the repo if that's critical for you

Right now agent-browser launches a fresh Chromium instance each time, so no persisted auth. For apps behind login, you’d need to either hit a page that doesn’t require auth, or script the login as part of your proofshot exec steps (type email, type password, click submit). Cookie/session injection is something I want to add, would make the auth flow much smoother for sure.

interesting, which model were you using for the vision part? In my experience Claude Sonnet and Opus handle UI screenshots reasonably well, not perfect but good enough that the agent can catch obvious layout issues and iterate. Definitely not at the “pixel perfect design implementation” stage yet though. But for testing features it's ok. The goal is for the agent to test that the UX/UI flow works, not that one pixel is correctly aligned with others in that case

agent-browser runs locally (it’s a Rust CLI + Node daemon on your machine), so there’s no cloud dependency on Vercel, it’s just built by the Vercel Labs team. Everything stays local :)

Simon’s tools are really great. Showboat is more for static screenshots though. ProofShot is the full session: recording, error capture, action timeline, PR upload. Different scope i'd say.