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what it does
Know what your app does — even the parts you didn't write
Most tools tell you what changed in your code. This tells you what your application can do: every entry point, what data each one touches, and whether anything checks who is asking. It reads without running anything. No account, no upload, no telemetry, one command writes a single HTML file that works offline. Scan again and it reports what changed about the behaviour, not which lines moved. MIT and free. A paid GitHub Action runs the same check on every pull request, free on public repos.
I build software on my own, and over the last year more and more of what I
shipped was written by a model and read by nobody. It worked. It passed review.
I could not have told you what half of it actually did.
So I wrote this. It reads a codebase without running it and reports every way
in — every route, server action and function anything outside can reach — what
data each one touches, and whether there is a visible check on who is asking.
Scan a second time and it tells you what changed about the behaviour, not which
lines moved.
Two things I would rather say up front than have you find:
It cannot see everything. Anything chosen at runtime is invisible to it, and
the absence of a finding is not proof that nothing is wrong. The report says so
on its own front page rather than in a footnote.
It is deliberately narrow. Next.js App Router, Cloudflare Pages Functions and
Supabase Edge Functions today. If it cannot read your project it names the
framework it found and says why it stopped, instead of printing an empty report.
Getting it to stay quiet was most of the work. On a real 4,000-file open-source
monorepo it reports nothing, because there is nothing there to report — a tool
that cries wolf on good code gets uninstalled the same afternoon.
Free forever, MIT, no account, nothing uploaded: npx what-it-does. There is a
paid GitHub Action that runs the comparison on every pull request, free on
public repositories.
The most useful thing you can send me is a case where it said something wrong
about your own code. That is what the accuracy work runs on.
About what it does on Product Hunt
“Know what your app does — even the parts you didn't write”
what it does was submitted on Product Hunt and earned 10 upvotes and 5 comments, placing #21 on the daily leaderboard. Most tools tell you what changed in your code. This tells you what your application can do: every entry point, what data each one touches, and whether anything checks who is asking. It reads without running anything. No account, no upload, no telemetry, one command writes a single HTML file that works offline. Scan again and it reports what changed about the behaviour, not which lines moved. MIT and free. A paid GitHub Action runs the same check on every pull request, free on public repos.
On the analytics side, what it does competes within Open Source, Developer Tools and GitHub — topics that collectively have 627.5k followers on Product Hunt. The dashboard above tracks how what it does performed against the three products that launched closest to it on the same day.
Who hunted what it does?
what it does was hunted by eriksenlabs. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of what it does including community comment highlights and product details, visit the product overview.
eriksenlabs