Your coding agent updated the pricing page and opened a pull request. You own the site — but you're not going to read a diff. Gist captures before-and-after screenshots of every page, and writes a plain-English walkthrough of what actually changed. Know what's going live — in 30 seconds.
$ npm install -g @gist/review
View on GitHub
Open source · runs entirely on your machine · no API keys, no hosted service
The pricing page now shows three tiers instead of two — a new "Team" plan was added between Starter and Pro, and the FAQ moved below the table. The homepage and about page only picked up the new footer link. Nothing else on the site changed.
Gist runs locally against a pull request's preview deploy — or any two URLs you point it at.
gist run --pr 42 screenshots every route on production and
on the PR preview, then diffs them pixel-for-pixel. Deterministic — same
inputs, same result, every time.
In Claude Code, /gist reads the evidence and diff
screenshots and writes the walkthrough — plain English, written for the
person who approves, not the person who codes.
gist ui opens a local viewer: the summary up top, then
before / after / diff for every page that changed. Understand — then
approve with confidence.
Three decoupled parts, connected only through a gitignored .gist/ folder on disk. The screenshots and diffs never depend on a model; the words never pretend to be the evidence.
gist run uses Playwright to capture every route at every
viewport, waits out lazy images and reveal-on-scroll sections, and diffs
base vs. head into evidence.json. No LLM anywhere in this
path.
gist ui is a tiny zero-dependency viewer over
PRs → runs → summary. It only reads
.gist/ — it never calls a model and never phones home.
The /gist skill runs inside the coding agent you already
have. It reads the evidence, looks at the diffs, and writes
summary.md. Re-runnable, and it uses your agent's
auth — Gist ships zero secrets.
Nothing to sign up for, nothing storing screenshots of your unreleased
pages. Everything stays in your repo's .gist/ folder.
The only AI step goes through Claude Code, which you've already authenticated. Delete the skill and Gist still works as a deterministic visual-diff tool.
Pages are ranked by how much they changed and whether the PR was supposed to change them — "changed as planned" reads differently from "unexpected."
A CLI, a static viewer, and a skill file. Read it in an afternoon; point it at any two URLs.
Coding agents now ship website changes faster than any human can review them. The bottleneck is no longer writing the change, or even correctness — it's understanding. The person who has to approve a change often can't read a diff, and shouldn't have to.
"Understanding is the new bottleneck."
— Geoffrey Litt · on cognitive debt in AI-built software. Gist applies it one layer up: not "help the engineer understand the code," but "help the approver understand the change."
$ npm install -g @gist/review
Read the guide