ComposalAPI and performance testing
Composal vs Lighthouse
Lighthouse evaluates page quality signals and automated audit rules; Composal verifies user journeys and can explore application behavior.
Two workflows, side by side
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 →Lighthouse
Web performance, accessibility, SEO, and best-practice audits
Lighthouse is an open-source tool from Chrome that audits web pages for performance, accessibility, SEO, and common best practices.
What each tool does
“With setup” means you supply code or configuration. “Not confirmed” means support for this workflow needs checking with the vendor.
| Workflow | Composal | Lighthouse |
|---|---|---|
| Run browser journeys | Yes Run saved browser Scenarios and return recordings and reproducible Findings. | Not confirmed Check whether this product includes this workflow in your intended plan and setup. |
| Map application workflows | Yes Discovery maps key application areas and user journeys. | Not confirmed Check whether this product includes this workflow in your intended plan and setup. |
| Explore for unexpected issues | Yes Deep Scan explores the running application and reports reproducible issues. | Not confirmed Check whether this product includes this workflow in your intended plan and setup. |
| Describe checks in plain English | Yes Author Scenarios around the intended user outcome, then review the steps and expected results. | Not confirmed Check whether this product includes this workflow in your intended plan and setup. |
| Run or inspect from a terminal | Yes Use the CLI to start and inspect verification runs and their Findings. | Yes Run repeatable page audits from the Lighthouse CLI. |
| Web performance and page audits | No Use a dedicated tool for this specialist workflow alongside Composal’s browser verification. | Yes Lighthouse is an open-source tool from Chrome that audits web pages for performance, accessibility, SEO, and common best practices. |
Where each fits
Choose Lighthouse when developers need repeatable page audits for performance, accessibility hints, SEO, or best practices.
Try this evaluation
Run Lighthouse against a stable page in the target environment and capture its report. In Composal, test one complete journey that uses that page and ask for exploration of nearby controls.
- 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?