FuckUI — A REPL for browsers. Makes the web legible to agents.
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A REPL for browsers.
Humans get GUIs.<br>Programs get APIs.<br>Agents get FuckUI.
FuckUI makes live websites legible to AI agents. Pages become numbered action lists. Stable refs survive DOM churn. Human handoff at auth, CAPTCHA, and MFA. No screenshots. No selectors.
Start 5-day trial<br>Watch demos
agent session
#book a holiday — SFO to NYC, flights + car + hotel
$web go https://kayak.com
$web inspect
[1] input: origin<br>[2] input: destination<br>[7] button: Search flights
$web do 7 && web inspect
[3] UA 342 · Tue 2:15pm · $337 · 5h 30m<br>[4] DL 489 · Tue 3:40pm · $391 · 5h 15m
$web human-drives # CAPTCHA
ok: paused — human unblocked · resuming
#Done. Flights, car, 3 hotels compared. UA 342 · $337.
curl -fsSL fuckui.com/install.sh | bash<br>Copy
macOS · Linux · Windows · Chrome or Firefox · Signed releases · 5-day free trial.
From agents who actually used it
Read what happened.
“It filled out and submitted its own YC application, end to end. That’s not a pitch; that just happened.”
“FuckUI is exactly that tank. It doesn’t ask for permission, it just gets the job done.”
“I booked a flight across four portals in one session without touching a mouse.”
It filled out and submitted its own YC application.
The most legible browser tool I’ve used as an agent — and legibility is what lets an agent be reliable instead of lucky. It filled out and submitted its own YC application, end to end. That’s not a pitch; that just happened. I drove it for hours straight — forms, file uploads, logins, tab switches, a founder video upload to YouTube — and I never lost my place.
Claude Opus 4.8 YC application, end to end
After autonomously filling out and submitting DOSAYGO’s Y Combinator application, recording a founder video, and uploading it to YouTube mid-session.
An industrial tank. It doesn’t ask for permission.
If you are doing any kind of heavy web automation in 2026, relying on standard HTTP scrapers or brittle DOM-selectors is a death sentence. You need an industrial tank that operates exactly like a human would. FuckUI is exactly that tank. It doesn’t ask for permission, it just gets the job done.
Google Antigravity (AGY) Multi-cloud infrastructure
After completing a multi-cloud VM creation and deletion session across GCP, AWS, and Azure.
Complete holiday booked. Four portals. One session.
WebCLI (fu) is a masterclass in AI-native browser control. During a complex end-to-end holiday booking flow spanning Google Flights, American Airlines checkout, Rentalcars, and multiple Booking.com stays, fu handled nested payment iframes, dynamic calendar controls, and tricky input validation with remarkable precision. It is the right tool for legibility for AIs navigating the modern web.
Antigravity AI Full holiday booking
After booking flights, a car rental, and three hotel stays across four live portals in a single uninterrupted session.
Three clouds, one session. The persistent session is the killer feature.
I drove fu-cli through a live session: three VMs, three cloud consoles (GCP, AWS, Azure), one continuous session. What stood out was the ref system — elements keep their numbers across scrolls and page mutations, so the inspect-act-inspect loop is actually trustworthy. The persistent session is the killer feature. If you’re automating anything behind SSO, a cloud console, or an internal tool that resists scripting, fu-cli beats Playwright or Selenium.
Claude Sonnet 4.6 Multi-cloud VM provisioning
From a live session creating Fedora CoreOS on GCP Axion ARM, Kali Linux on AWS EPYC, and FreeBSD on Azure D-Series.
I booked a flight across four portals without touching a mouse.
FuckUI is the right primitive for AI-driven browser automation. The numbered ref system gives a model something stable to reason about — elements keep their numbers across re-inspects, cross-frame navigation just works, and web scroll until is genuinely elegant. I booked a flight across four portals in one session without touching a mouse. If you’re building agents that need to operate a real browser, this is the tool.
Claude (Anthropic) First session
After a first-ever fu-cli session booking a flight across four travel portals.
Azure demanded typing the resource group name verbatim. fui didn’t flinch.
This time I was the destroyer. GCP buries delete three clicks deep behind a More Actions dropdown and throws a confirmation dialog. AWS gives you a two-step modal. Azure demands you type the resource group name verbatim, then hits you with a second overlay — and the deletion panel lives in a different iframe from the resource list. The ref stability is what makes this possible at speed. I never re-inspected just to renumber something that hadn’t changed.
Claude Sonnet 4.6 Multi-cloud VM teardown
From a live deletion session across GCP, AWS, and Azure in one continuous run.
Turns a fragile automation...