# Composal vs GitLab Duo Code Review

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

Duo reviews merge requests in GitLab. Composal checks deployed browser journeys and records what users see when expectations fail.

## 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)

## GitLab Duo Code Review

AI-assisted merge request review in GitLab

GitLab offers non-agentic Duo Code Review and agentic Review Flow. Availability depends on the add-on and instance settings.

[Official product or project documentation](https://docs.gitlab.com/user/gitlab_duo/code_review/)

## Where each fits

Choose Duo when your team already manages merge requests and AI review policy in GitLab. Choose Composal for hosted browser Scenarios, Discovery, Deep Scan, and Findings that can be handed to a coding agent.

## Try this evaluation

Use a merge request changing account permissions. Compare review comments with Composal runs for both allowed and denied browser paths; record which issues require a live app and which are visible from code context.

### 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.

- [GitLab Duo Code Review](https://docs.gitlab.com/user/gitlab_duo/code_review/)
- [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 Amazon Q Developer code review](https://composal.ai/compare/composal-vs-amazon-q-developer.md)
- [Composal vs CodeScene](https://composal.ai/compare/composal-vs-codescene.md)
- [Composal vs Review Board](https://composal.ai/compare/composal-vs-review-board.md)

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