# Composal vs BackstopJS

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

BackstopJS gives teams control over screenshot scenarios and visual baselines. Composal provides hosted browser Scenarios and exploratory QA for checking user outcomes, with Findings organized for follow-up.

## 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)

## BackstopJS

Open-source visual regression testing

BackstopJS is an open-source visual regression tool that captures web pages and compares them with reference screenshots.

[Official product or project documentation](https://github.com/garris/BackstopJS)

## Where each fits

Choose BackstopJS when you want an open-source, self-hosted visual regression suite and are comfortable maintaining its fixtures and execution setup.

## Try this evaluation

Create a small BackstopJS suite for three stable pages and one responsive viewport pair. In parallel, define a Composal Scenario for the main task that crosses those pages. Introduce one controlled layout shift and one functional defect.

### 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.

- [BackstopJS](https://github.com/garris/BackstopJS)
- [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 reg-suit](https://composal.ai/compare/composal-vs-reg-suit.md)
- [Composal vs Applitools](https://composal.ai/compare/composal-vs-applitools.md)
- [Composal vs Percy](https://composal.ai/compare/composal-vs-percy.md)

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