Free tools for changing a live product
Free tools for product teams and for apps built with AI: analyse a landing page, check a site before launch, explain a pull request, write a PRD from your real codebase, and find out why an AI-built app broke. No signup.
For product and marketing teams
Read a page the way a visitor does, check a site before it goes live, understand a pull request before you approve it, and write the spec for a change from the real codebase.
Why isn't this page converting?
Landing page analyzer. Loads the page on a phone and a desktop, checks what a visitor sees first, and returns prioritised findings with the evidence and A/B tests worth running.
Loads the public page · nothing is clicked or changed
What exactly should we build?
PRD generator. Turns a change you want into a PRD with scope, acceptance criteria and edge cases — and, from a public repo, the files it will actually touch.
Reads your description and a public repo's file list
Is this site ready to launch?
Launch checklist. Runs the pre-launch checklist against the live or staging address — indexing, metadata, mobile, forms, analytics, legal pages — and gives a go or no-go.
Reads the public site · nothing is submitted
What does this pull request actually change?
Pull request explainer. Explains a public GitHub pull request in plain English: what users will notice, what is risky, and what to test before you approve it.
Reads a public pull request · nothing is posted
For apps built with AI builders
For apps made with Lovable, Bolt, v0 or Replit: find out why one broke, whether a key is safe to expose, and which variables reach the browser.
Why is my app broken?
Broken-app check. Reads your published app the way a visitor would and names the most likely cause, with the evidence behind it.
Reads your published app · no access to your code
Is this key safe to expose?
Key checker. Tells you whether a key is meant to be public or must never leave your server. Decoded in your browser.
Runs in your browser · nothing is sent anywhere
Which variables reach the browser?
Variable checker. Shows which of your environment variables your framework bakes into the public bundle, and which stay server-side.
Runs in your browser · nothing is sent anywhere
Finding it is the easy half
Plenty of tools will tell you what is wrong with a page, a launch or an app. Almost none of them will change it — you are handed a report and left to find someone who can act on it: a ticket that waits for next sprint, an agency’s week, a couple of thousand dollars.
These tools are free and need no account because the answer is not the valuable part. Refinar is what happens next: it reads your repository, makes the change in a live preview, and says out loud which changes a person should approve before they ship.
App built with Lovable, Bolt or v0 and not sure what broke? Start from the symptom.