# Composal vs Happo

By Composal. Sources reviewed: 2026-10-15.

Happo specializes in rendered-image comparisons and accessibility signals attached to UI captures.

## Composal

Composal sends AI browser agents to use your running web app and check the outcomes you care about. Define journeys as plain-English Scenarios, map existing flows with Discovery, or explore for bugs with Deep Scan. Runs keep recordings and reproduction steps so your team or coding agent can investigate a Finding.

[Verify documentation](https://composal.ai/docs/verify)

## Happo

Visual regression and accessibility checks

Happo captures UI states from Storybook, Playwright, Cypress, or custom pages and compares them in supported desktop and mobile browsers. Its product materials also describe accessibility testing and pull-request review for visual changes. Teams can integrate it with existing UI fixtures and evaluate diffs before merging.

[Official product or project documentation](https://happo.io/)

## Where each fits

Choose Happo when visual regressions across browser configurations and accessibility checks are important parts of your frontend workflow.

## Try this evaluation

Pick a page with a stable screenshot, one color-contrast requirement, and a submission action.

### Coverage

Which user outcomes must this release prove, and which specialist checks must stay in your existing stack?

### Setup

Who prepares accounts, test data, permissions and access to the deployment being tested?

### Evidence

Can the engineer reproduce a reported failure from the recording and steps, without asking the tester to investigate again?

### Ownership

Who updates the checks when the product changes, and can the team review what a passing result actually proves?

## Sources and scope

Prepared by Composal with AI-assisted research using the linked first-party product pages and documentation. These are workflow comparisons, not independent benchmarks or an exhaustive feature inventory. A documented capability is not a guarantee for every plan or environment; validate your own requirements in a trial.

- [Happo](https://happo.io/)
- [Composal Verify](https://composal.ai/docs/verify)
- [Composal Deep Scan](https://composal.ai/product/deep-scan)

No comparative speed, price or accuracy score is claimed here. Product names belong to their respective owners.

## Related comparisons

- [Composal vs Lost Pixel](https://composal.ai/compare/composal-vs-lost-pixel.md)
- [Composal vs Argos](https://composal.ai/compare/composal-vs-argos.md)
- [Composal vs BackstopJS](https://composal.ai/compare/composal-vs-backstopjs.md)

[All comparisons](https://composal.ai/compare.md)