# UI review for engineers

> See what the running PR head actually does before you merge UI-affecting changes. Overview for agent and human PRs on web apps. hello@diffraction.sh.

Canonical: https://www.diffraction.sh/for/engineers

## TL;DR

You already review diffs. Agent PRs and human PRs that touch UI still leave a gap: the code can look right while the running product fails a real path.

Diffraction is private MVP / design-partner ready UI review (product experience review) for UI-affecting GitHub PRs on web apps. It is aimed at showing what the PR head actually does, with aberrations backed by evidence. Tagline: See the full spectrum of every diff.

## Quotable definitions

Aberration (eng framing): a verified product-experience failure found while reviewing a running UI: something a user would hit that a clean diff and green checks did not catch.

PR head as product: reviewing the PR head means experiencing the running change, not only reading the patch or trusting a preview glance.

## Problem for engineers

Visual breakage can be one aberration. So can a path that looks fine and cannot complete the job. Diffraction's category is product experience review, not screenshot diffing.

Thesis: source correctness ≠ product correctness.

Contrast: https://diffraction.sh/ui-review-vs-visual-testing.

## What Diffraction gives engineers

A clearer overview of UI-affecting PRs (agent or human) before you merge. Concrete findings: repro path and evidence, not LGTM from the screenshot.

Category: https://diffraction.sh/ui-review. Terms: https://diffraction.sh/glossary.

## How it fits an engineer workflow

Stay in GitHub. Treat UI-affecting PRs as needing product truth, not only diff truth. Useful when agent volume is up and human attention per PR is down.

https://diffraction.sh/blog/three-checkboxes-almost-billion-dollars

https://diffraction.sh/blog/six-people-national-signup-flow

https://diffraction.sh/blog/button-costing-300-million-a-year

## Soft product bridge

If you ship web apps on GitHub and want early design-partner access to a private MVP, email hello@diffraction.sh.

Soft CTA only: hello@diffraction.sh. Sibling pages: https://diffraction.sh/for/executives, https://diffraction.sh/for/designers-and-qa, https://diffraction.sh/for/engineering-leads.