Automate visual testing without writing code
A deterministic engine, forged by AI.
Reliability AI-hardened across 425+ pages: 0 false positives, 0 false negatives.
- Install the app. Open your site.
- Browse normally, we capture everything.
- Run it again tomorrow: every difference shows up.
Built to understand change, calmly
Clear results. No noise.
Record without coding
Browse your site normally. Delta-QA captures your actions automatically.
Replay in one click
Run your scenarios whenever you want. Tests execute on their own.
See what changed
Side-by-side visual comparison. Differences are highlighted automatically.
Why it feels different
- No code to write
- No selectors to maintain
- No mandatory cloud
Good engineering doesn't shout.
It just keeps things under control.
Visual and functional comparison, side by side
See layout changes.
See behavior changes.
See content changes.
If a pixel moved, you'll see it.
If nothing moved, you'll see that too.
Reliability forged by AI
Determinism isn't declared, it's proven.
To make our engine reliable, several AI agents put it to the test across thousands of possible HTML combinations, and we keep only the comparison logic that never gets it wrong.
- AI explores. Thousands of page structures, nestings and dynamic contents are generated and stress-tested.
- Determinism guarantees. At runtime, no model, no black box: same inputs, same results.
- And it improves every day. Every version of the algorithm is re-validated against 425+ stress pages: 0 false positives, 0 false negatives.
Not determinism promised on top of a black box. Determinism proven.
What Delta-QA detects
437 validated test cases. 0 false positives.
One scenario. Multiple browsers.
Because users have opinions.
Browsers too.
Control is not optional
Whether you run tests locally, on-premise, or in the cloud:
- Your data stays yours
- Your tests remain accessible
- Nothing is hidden behind black boxes
We like to know where things run.
And where data lives.
Built in France. Designed for trust.
We take privacy seriously.
It's a European thing.
We don't just run tests.
We keep receipts.
And we know where they're stored.
Explore the blog
Guides, tool comparisons and field reports on visual testing.
Understand your changes.
Choose how you run.
Frequently Asked Questions
Everything you need to know about Delta-QA
Delta-QA is a free visual regression testing tool that automatically detects visual changes on your web pages: it renders both versions in a real browser and compares the visual output, flagging only what a human eye would notice. The desktop version is completely free with no limitations.
Yes, Delta-QA desktop is completely free for macOS and Windows. No signup, no credit card, no time limit. Team and Business plans with advanced features are coming soon.
Delta-QA is available for macOS and Windows. Cloud and On-Premise versions are coming soon. Interested? Let's talk!
Delta-QA requires no coding. Simply record your user journeys by browsing normally, then replay and compare automatically. No scripts, no configuration files, no command line.
Delta-QA keeps everything on your machine. No mandatory cloud, no dependency on external services. Your screenshots, reports and comparisons never leave your computer. On-Premise option also available for enterprise servers. Contact us
Delta-QA renders both versions in a real browser and compares the visual output. It detects 38+ categories of CSS changes including colors, typography, layout, borders and animations, with zero false positives. Multi-viewport comparison across responsive breakpoints is coming soon; today Delta-QA compares at a fixed desktop viewport.
Delta-QA goes beyond plain pixel-to-pixel: it renders both pages in a real browser and compares the visual output with analysis calibrated on human perception. Unlike text diffs, it detects real visual differences that users see on screen: shifted elements, color changes, font differences, spacing issues, without false positives.
With Delta-QA, record your user journeys by simply browsing your site. The tool captures each step, then replays and compares automatically. No test frameworks, no code: just browse and click.
A text diff compares source code line by line and misses CSS rendering differences. A visual comparison like Delta-QA renders both pages in a browser and compares the actual visual output, detecting the real differences users see on screen.
Delta-QA relies on a deterministic visual comparison engine, calibrated on human perception to flag only the differences a human eye would notice. Hardened continuously by a large suite of test cases, it achieves zero false positives. Each detected change includes a strength score (0-100%) so you can filter minor variations and focus on real regressions.