The Visual Bugs That Reach Production: 100 Real Cases
We took 100 differences that website teams marked as bugs and sorted them into nine categories. Most were small things that moved. Two were error pages.
Visual TestingTestingQA
Testing
20 articles tagged “Testing”
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Screenshot Testing: How to Get Reliable Results
Screenshot testing works only when the same page gives the same image twice. How to capture reliably, what to compare, and how to tell flake from a real bug.
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The Best Visual Regression Testing Tools in 2026
Open-source and hosted visual regression testing tools compared on price, free tiers and what they actually screenshot. Every figure from the vendor's own page.
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AI Visual Testing: What It Actually Does (and Doesn't)
Every visual testing tool now advertises AI. What the models actually do, what stays deterministic, and where AI still gets it wrong, with the numbers.
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Responsive Design Testing: Breakpoints Checklist and Tools
Which breakpoints to test in 2026 (with device data), what breaks at each one, manual vs automated testing, the tools, and how to screenshot every breakpoint on every deploy.
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Website Migration Testing Checklist (with Visual QA)
A practical website migration testing checklist: build the URL inventory, verify redirects and content, compare every page visually at every breakpoint, and keep monitoring after launch.
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Diffy AI Summary: Visual Diffs Explained in Plain English
Diffy AI reads every changed screenshot in a comparison and writes one plain-English summary, split into Critical and Minor changes. Available on request.
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AI Screenshot Checks: Recommendations For Better Screenshots
Diffy's AI check catches cookie banners, CDN challenge pages, unloaded media and broken layouts before they turn into false positives in your results.
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Visual Regression Testing: When and What to Test
Visual regression testing sits between manual QA and automated tests. When it makes sense, what to test, and why good screenshots are hard.
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25 QA & Web Development Testing Statistics for 2026
25 web development and QA testing statistics on bugs, automation and design, with sources, to help you benchmark your own testing process.
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Regression Testing: Your Step-by-Step Action Plan
A step-by-step regression testing plan for a website you did not build, including how to prioritise tests, plus two real-world worked examples.
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12 Common Visual Bugs Automated Testing Catches
The visual bugs you can catch by eye and the ones you cannot, based on the regressions we see most often across the sites Diffy tests daily.
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Automation Testing 101: Benefits, Types & Tools
What automation testing is, when it beats manual testing, the main types of automated tests, and how to choose the right tool for your project.
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User Acceptance Testing: Checklist and Process
User acceptance testing explained: prerequisites, a full UAT checklist, how to plan it, and how to identify test scenarios and prepare test data.
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Compatibility Testing: Types, Examples & Tools
Compatibility testing explained: the main types, worked examples, and the tools we recommend for checking your site across browsers and devices.
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Functional vs. Non-Functional Testing Compared
Functional vs non-functional testing compared: what each one measures, when you need it, and the tools we recommend for both kinds of testing.
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Non-Functional and Functional Testing: Types and Tools
The full testing taxonomy in one guide: functional types (unit, integration, system, acceptance) and non-functional types (load, volume, security, scalability), with examples and tools.
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How to Screenshot Tabs, Mobile Menus and Sliders
How to capture screenshots of tabs, mobile menus and sliders by running click actions on the page before each screenshot is taken.
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Visual Testing False Positives: 5 Ways to Fix Them
Why visual tests flag changes that aren't bugs, and five fixes: mask elements, hide them with CSS, freeze animations, use content fixtures and sync environments.
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Visual Testing of Patternlab and Drupal
How to run visual regression testing against a Patternlab component library in Drupal and catch regressions across every component at once.
DrupalVisual TestingTesting