The PixellPeep Blog
Field notes on visual regression testing, design fidelity, and shipping UI you can trust — written by the people building it.
Why your screenshot tests keep crying wolf
Flaky visual diffs train teams to ignore failures. Here's what actually causes the noise — anti-aliasing, font rendering, sub-pixel shifts — and how we tune it out without hiding real bugs.
Pixel-diff vs. structural similarity: picking the right engine
Six comparison algorithms sounds like overkill until you realise a checkout page and a chart dashboard need completely different definitions of 'changed'. A practical guide to choosing.
We replaced our manual UI review checklist with one CI check
Before every release we used to eyeball a dozen screens by hand. It was slow, inconsistent, and the things we missed were always the boring ones. Here's how we moved that into the pipeline.
Catching design drift: keeping your live app true to Figma
Designs and shipped UI diverge slowly — a token here, a spacing tweak there. Design Fidelity grades your real screens against their Figma frames so drift surfaces before it compounds.
A practical guide to baselines that don't rot
A baseline is a promise about what 'correct' looks like. Treat it carelessly and your whole suite degrades. Some habits we've learned for keeping baselines honest.
Playwright visual regression testing: a practical guide
Playwright ships screenshot comparison out of the box, but a CI-ready visual regression setup needs more than toHaveScreenshot. Here's how to do it well — and when to reach for a managed platform.
Cypress visual regression testing: setup and the plugin trap
Cypress has no native screenshot diffing, so visual regression means plugins — and plugins mean setup and maintenance. Here's how to wire it up, and how to skip the upkeep.
Looking for a Percy alternative? What to weigh in 2026
Percy is solid, but many teams started shopping after pricing climbed post-acquisition. Here's an honest look at what to evaluate in a Percy alternative — pricing, algorithms, and CI fit.