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.
How to catch visual UI bugs before they reach production
Visual bugs slip through unit tests and code review because nothing is looking at the rendered pixels. Here's a practical, tool-agnostic playbook for catching layout breaks, overflow, and theming regressions before users do.
Visual regression testing for WordPress: a practical guide
WordPress breaks visually for one reason above all others: updates. Plugins, themes and core all ship changes you didn't write. Here's how to catch layout damage automatically before your visitors do.