# Website and web app Testing

## Cover every component, page, and browser

Applitools covers every layer of your web app, from a single component to a full cross-browser release, with Visual AI catching what a functional test alone would miss.

## Test every layer

Validate a single Storybook component, a full page, or a release across hundreds of browsers, all from the same SDK.

## Run fully in the cloud

Execute your entire suite in parallel in the cloud, so a full cross-browser run takes minutes instead of hours.

## Debug with full context

Every run comes with video and logs, so you can see exactly what happened instead of re-running the test to find out.

## What Applitools covers across your web app

**Optimizely + AI Coding Agents: Give your dev team visual "eyes."**

## Start testing before a page even exists

**Component-level checks** Test a component in Storybook as it's built, so a visual bug gets caught before it ships to a real page.

**Full-page coverage from the same SDK** Use the same eyes.check call to validate an entire page once components come together. No separate tool required.

## Run against hundreds of browsers without hundreds of machines

**The Ultrafast Grid** An engine that reproduces each browser's rendering in parallel instead of spinning one up for every test, so a full cross-browser run takes minutes.

**Parallel execution in the cloud** Your entire suite runs in parallel in the cloud, so adding more browsers doesn't add more time to your pipeline.

## Test what's behind your firewall, too

**Run in your existing framework** SDKs integrate directly with Playwright, Cypress, Selenium, and Appium, so it's the same test you already wrote, not a new tool to learn.

**Local and private app support** Connect to apps behind a firewall or on a local network, so security requirements don't slow down your testing.

## Know what happened without re-running the test

**Full logs and video** Every run comes with a video and detailed logs, so you can see exactly what the browser did instead of guessing.

**Root Cause Analysis** See the exact DOM and CSS change behind a diff, so a failure comes with an answer, not just a red X.

## What backs up every web test

# 1

## Auto-maintenance

Group related visual changes across browsers and resolutions and update every affected baseline in one click.

# 2

## Dynamic content handling

Choose the AI match level that works for you to control what counts as a regression, and let Applitools automatically ignore dynamic data like timestamps, session IDs, and A/B content instead of flagging it as a failure.

# 3

## Cross-browser and -device coverage

The Ultrafast Grid and Native Mobile Grid render the same test across every browser and device in parallel, without a local grid to maintain.

# 4

## Deterministic Language Model

The same input always produces the same output, so a result is something you can explain and trust, not a probability.

# 5

## Human-eye simulation

Visual AI ignores rendering noise like anti-aliasing and sub-pixel shifts, and flags only the changes a real user would notice.

# 6

## No-code and code authoring

Write checks in plain English, record a flow, or write code directly, so the whole team can add coverage.

## Ready for the next generation of testing?