aiuser.tools

Small, sharp tools for building with AI.

We make focused browser tools that smooth the handoff between you and the AI you build with. No account to set up, no subscription to forget about. You buy a tool once and it stays yours.

See CSS Tweaker €15 one time
14-day refund
CSS Tweaker
button.cta, live on this page
Background
Font
Text size 16px
Weight 620
Radius 9px
Shadow
The first tool

CSS Tweaker

Edit any website's CSS by hand, right in the browser, then export a clean brief your AI assistant can apply to the real code. It turns a vague "make the button bigger" into exact, mapped changes.

  • Point at any element and adjust around a hundred properties with real controls.
  • Export a structured handoff: selectors, before and after values, and your intent.
  • Paste it into Claude, Cursor or Copilot and the change lands in your real files.
See how it works
Price
€15
One time. No subscription, ever.
Works in
Chrome, Edge, Brave, Arc and other Chromium browsers.
Your data
Stays in your browser. No account, nothing to sign up for.
How we think about tools

Small on purpose.

01

One job, done properly

Each tool does a single thing well, instead of a hundred things you have to wrestle with. Less to learn, less to go wrong.

02

No lock-in

No account, no subscription, no quiet telemetry. You buy a tool once and it keeps working, with or without us.

03

A real person behind it

Built by a small team that uses these tools daily. When you email, a human reads it and writes back.

Get started

Start with CSS Tweaker.

One tool, fifteen euros, yours to keep. See exactly what it does and try it live on the page.

See CSS Tweaker