Baz reviews the change.
Hyrax architects the codebase.
Baz reviews pull requests as structured changes rather than raw text diffs, which produces sharper review insight. Hyrax works at repository scale: it audits six domains and delivers changes verified against the project test suite.
- Hyrax audits roughly 400 of its own repositories.
- Free plan: full access, up to 100 PR reviews a month, a $30 starter credit, and $10/month ongoing.
Verified end to end, with no Baz handoff
What changes when Hyrax runs above the tools.
The codebase, not the diff
Baz sees the change in front of it. Hyrax audits the whole repository, so problems that no single pull request touches still surface.
Verified before it arrives
Every change runs the project baseline tests, build and lint, and passes a second reviewer agent, before the pull request exists.
Context that compounds
The map of the codebase lives in the repository and strengthens with every merge, so the next decision starts from everything learned before it.
How Hyrax and Baz make decisions.
| Decision criteria | Baz | Hyrax |
|---|---|---|
| Unit of work | The pull request, reviewed as a structured change. | The whole repository, audited continuously across six domains. |
| Codebase context | Analyses the change against repository history and API surfaces. | A durable map committed to the repository as HYRAX.md and .hyrax/discovery, so it strengthens as the codebase changes. |
| Output type | Review insight and suggested revisions. | Verified pull requests, plus issues ranked by severity and effort. |
| Verification | Advisory. The team runs the checks. | Baseline tests, build, lint and a second reviewer agent run against the project itself before a pull request opens. |
| Human control | The team applies revisions and merges. | A human approves and merges every pull request. Hyrax never merges on its own. |
| Delivery surface | GitHub pull requests and the Baz app. | GitHub pull requests, with issues and posture in the Hyrax console. |
| Pricing model | Free plan, then per seat. | Free plan with a $30 starter credit and $10/month ongoing. Paid is $30 per user per month and each paid user gets $30/month of credits. |
Read how Baz describes itself: baz.co(opens in a new tab)
Comments on a diff, or a verified pull request.
- 01A pull request opens and Baz reads the diff.
- 02Baz returns comments, summaries and suggested changes.
- 03The team interprets the feedback, makes the edits, and merges.
- 01Maps the codebase and keeps the map in the repository
- 02Applies architectural judgment across six domains
- 03Opens a verified pull request that a human merges
GitHub-native. Human-controlled. Verified before merge. No training on customer code.
From install to the first verified pull request.
Install the GitHub App
Grant read access to the repositories in scope. No card is required to start.
Hyrax maps the repository
Discovery writes HYRAX.md and .hyrax/discovery into the repository, so humans and AI tools read the same context.
Review the first pull request
Approved upgrades arrive as verified pull requests. A human merges every one.
Both tools solve real problems.
Choose Baz if
The priority is deeper insight into what a specific change does, especially across API boundaries. Baz is designed for that reading of a pull request.
Choose Hyrax if
The priority is the state of the codebase over time. Hyrax audits continuously, ranks issues by severity and effort, and verifies every change before review.
Free plan for small teams, then per seat.
Free plan with a $30 starter credit and $10/month ongoing. Paid is $30 per user per month, and each paid user gets $30/month of credits.
Questions about Baz and Hyrax.
Does Hyrax work alongside Baz?
Yes, and most teams run both. Baz keeps doing its job. Hyrax works at the level of the whole codebase, decides what is worth changing, and delivers verified pull requests. Nothing about the Baz setup has to change.
What does Hyrax change in the repository?
Discovery writes HYRAX.md and a .hyrax/discovery directory, which document the architecture, conventions and risk areas of the codebase. Everything else arrives as a normal pull request on its own branch. Hyrax has no write access to the default branch.
How does pricing work?
The free plan includes full access, a $30 starter credit and $10/month of credits ongoing, with no card required. The paid plan is $30 per user per month, and each paid user gets $30/month of credits. Pull request reviews are included on every plan.
What happens after signup?
Installing the GitHub App and granting access to a repository takes a few minutes. Hyrax maps the codebase, then runs the first audit and returns issues ranked by severity and effort. The first verified pull requests follow once an audit is approved.