jberthom

Show HN: ProofShot – Give AI coding agents eyes to verify the UI they build

I use AI agents to build UI features daily. The thing that kept annoying me: the agent writes code but never sees what it actually looks like in the browser. It can’t tell if the layout is broken or if the console is throwing errors.

So I built a CLI that lets the agent open a browser, interact with the page, record what happens, and collect any errors. Then it bundles everything — video, screenshots, logs — into a self-contained HTML file I can review in seconds.

proofshot start --run "npm run dev" --port 3000
# agent navigates, clicks, takes screenshots
proofshot stop

It works with whatever agent you use (Claude Code, Cursor, Codex, etc.) — it’s just shell commands. It's packaged as a skill so your AI coding agent knows exactly how it works. It's built on agent-browser from Vercel Labs which is far better and faster than Playwright MCP.

It’s not a testing framework. The agent doesn’t decide pass/fail. It just gives me the evidence so I don’t have to open the browser myself every time.

Open source and completely free.

https://github.com/AmElmo/proofshot

https://proofshot.argil.io/

Mar 24 at 7:46amWeb
Show threadVadimPR5d ago
Looks nice! Does it work for desktop applications as well, or is this only web dev?
Show threadtheshrike795d ago

What does this do that playwright-cli doesn't?

https://github.com/microsoft/playwright-cli

GitHub - microsoft/playwright-cli: CLI for common Playwright actions. Record and generate Playwright code, inspect selectors and take screenshots.

CLI for common Playwright actions. Record and generate Playwright code, inspect selectors and take screenshots. - microsoft/playwright-cli

GitHub
Show threadjofzar5d ago
These aren't really comparable, OP's is something that records, captures and reproduces with steps.
Show threadlastdong5d ago
This is basically what antigravity (Google’s Windsurf) ships with. Having more options to add this functionality to Open code / Claude code for local models is really awesome. MIT license too!
Show threadcan16358p5d ago

How would this play with mobile apps?

I'd love to see an agent doing work, then launching app on iOS sim or Android emu to visually "use" the app to inspect whether things work as expected or not.

Show threadjofzar5d ago

I'm going the opposite of everyone else is saying.

This is sick OP based on what's in the document, it looks really useful when you need to quickly fix something and need to validate the changes to make sure nothing has changed in the UI/workflow except what you have asked.

Also looks useful for PR's, have a before and after changed.