Automate your tests without writing code
Your critical features, automatically verified every time you ship.
Create a free accountRecord once. Replay forever.
Record without coding
Replay in one click
See what changed
Visual and functional comparison, side by side
- LayoutSee layout changes.
- BehaviorSee behavior changes.
- ContentSee content changes.
If a pixel moved, you'll see it.
If nothing moved, you'll see that too.
Our MCP
The Delta-QA MCP server connects your AI agent (Claude Code, Codex, Cursor, VS Code…) to your Delta-QA account. Give it the tests you have already written: it creates the scenarios in Delta-QA, and your manual tests move to automation without starting from scratch.
- Nothing to retype: your documented tests are the starting point, and the agent turns them into Delta-QA scenarios.
- A complete base, fast: your whole manual test campaign lands in Delta-QA, without recreating each scenario one by one.
- You stay in control: every scenario created is replayed and photographed by Delta-QA, and you decide what goes into your regression tests.
›Create a regression test of the “Checkout” journey on example.com
list_workspaces…1 workspace, “Can edit” rolecreate_scenario…Scenario created, step 1 opens the pageDRAFTset_scenario_steps…3 steps saved, #2 to #4capture_scenario…Replay started on the real siteget_capture_resultReplaying, taking photos…Action #4:button.paymatches no visible elementFAILED- The Pay button has no such class: I'll target its data‑testid attribute instead.
set_scenario_steps…Step #4 fixed:button[data-testid=pay]capture_scenario…New replay startedget_capture_resultReplaying, taking photos…4 steps replayed, 4 photosCOMPLETEDactivate_scenario…The capture becomes the referenceACTIVE
- #1
- #2
- #3
- #4
What Delta‑QA detects
434 validated test cases. 0 false positives.
Values & states
Prices, counters, statuses, form states: what the page shows, not how it shows it.66 test casesStructural change, no visual impact
The DOM changes, the render stays identical → zero false positives.6 test casesForms & States
Input styling, checkbox/radio, validation states, focus indicators, placeholders.22 test casesAnimations
Frozen transitions, keyframe snapshots, hover state captures.12 test casesHolds up at scale
Huge pages, hundreds of differences caught without missing one.8 test casesColors & Themes
RGB, HSL, OKLCH color changes, dark mode switches, CSS custom properties.26 test cases
Deterministic AI, hardened by research
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 learned model, no black box: same inputs, same results.
- stress-tested pages replayed on every release
- 434
- false positives
- 0
- false negatives
- 0
Not determinism promised on top of a black box. Determinism proven.
One scenario. Multiple browsers.
Because users have opinions.
Browsers too.
| Step | Chrome | Firefox | Safari |
|---|---|---|---|
| Open the cart | Passed | Passed | Passed |
| Add an item | Passed | Passed | Passed |
| Check the total | Passed | Passed | Difference |
| Click “Pay” | Passed | Passed | Passed |
Control is not optional
Whether your tests run in our cloud or on your own infrastructure:
- 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.
- Privacy by design
- No tracking
- No ads
- No data resale
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.
Playwright MCP and Regression Testing: Create with the Agent, Replay Without an LLM
Playwright MCP lets an AI agent test your site. For regression testing, the agent creates the scenario and Delta-QA replays it identically.
Storybook visual testing without Chromatic: Free & no-code
Storybook visual testing without Chromatic: compare Percy, Playwright & Delta-QA. No-code reviews, no credit card, no lock-in, no per-snapshot bill.
The 10 best visual testing tools in 2026: Comparison by category
Top 10 visual regression testing tools in 2026: no-code, SaaS, open source, emerging. Strengths, profiles, and limitations.
Chromatic vs Percy 2026: Pricing, Free Tiers & Limits
Chromatic vs Percy in 2026: real pricing, free-tier limits and an 8-point comparison, plus a free, no-code regression testing alternative, no credit card.
Applitools Pricing 2026: Plans, Test Units & Real Costs
Applitools doesn't list public prices. How its Test Unit model works, estimated Free, Growth and Enterprise costs, and 5 alternatives compared.
Visual regression testing: The complete guide (2026)
Definition, baselines, automated comparison, tool comparison: the complete guide to visual regression testing for catching invisible UI bugs before production.
Understand your changes.
From your browser, in a minute.
Frequently Asked Questions
Everything you need to know about Delta‑QA
Delta-QA is a visual regression testing tool that automatically detects visual changes in your web pages: it renders both versions in a real browser and compares the visual result, flagging only what a human eye would notice. The free plan covers 100 checkpoints per month, no credit card required.
Yes. Delta-QA's free plan includes 100 checkpoints per month, no credit card and no commitment. The Pro and Business plans add volume, enterprise SSO and a longer history.
Delta-QA runs in your browser, on Mac, Windows or Linux — nothing to install. An On-Premise edition installs on your own infrastructure. 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.
The Delta-QA On-Premise edition installs on your own servers: your screenshots, reports and comparisons never leave your network, with no outbound connection at all. 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.