The regression
def refund(order, payment):
payment.refund(order.total)
order.status = "refunded"
return order
1 check, 1 broken. Refunded orders cannot be refunded again.
Perch lets an agent select one saved English requirement and check the current method. Qodo also offers custom rules and pooled billing without seat fees; Perch’s distinction is the named check, explicit scope and cached unchanged answer.
perch check reads working files; perch scan reads Git HEAD. Relevant source is sent to TypeSafe’s hosted models. The MIT CLI does not run model inference offline.
A saved requirement makes a recurring mistake checkable. In this Perch capture from September 20, 2026, the same rule flags a missing guard and passes after the guard is restored.
def refund(order, payment):
payment.refund(order.total)
order.status = "refunded"
return order
1 check, 1 broken. Refunded orders cannot be refunded again.
def refund(order, payment):
if order.status == "refunded":
return order
payment.refund(order.total)
order.status = "refunded"
return order
1 check, nothing to report.
Source: public order-service checkout.py at the linked commit. The captured standalone file is refund.py. Perch command output and timestamp. This saved-rule demonstration does not measure Qodo's detection rate.
Perch turns project behavior into focused checks that agents can run before committing. Use these differences to choose the review workflow and billing model your team needs.
| Capability | Perch | Qodo |
|---|---|---|
| Billing | 10¢ per 1,000 fresh rule checks. Cached checks free. No seat fees. | Pro Team: $30/month for 2,500 pooled credits. No user, repository or review-count cap.Vendor documentation ↗ |
| Before commit | perch check reads the files on disk, including uncommitted edits. | CLI, Git and pre-PR review skills.Vendor documentation ↗ |
| Custom requirements | English ensure rules in perch.yaml: project, file or method scope. No paid custom-rule tier. | Managed Qodo supports English compliance instructions and team rules; separate PR-Agent supports repository configuration.Vendor documentation ↗ |
| Coverage | Each parsed non-test application method in the selected scan scope is read, with caller and callee context. No method-count cap. | Team PR review, code context and compliance checks.Vendor documentation ↗ |
| Open source | MIT-licensed CLI. Hosted model analysis is a paid service. | Commercial Qodo service; PR-Agent is a separate MIT community project.Vendor documentation ↗ |
Qodo also pools usage without seat fees. Choose Perch when the unit you want to manage is a fresh rule check: select a requirement, check the working file, and reuse unchanged answers from the cache. Keep method-level behavior rules in the repository.
Qodo: CLI, Git and pre-PR review skills. Qodo workflow documentation.
Perch reads the current working file with perch check. For a known requirement, select its rule name and method instead of requesting another broad review. A local CLI describes where the command runs; Perch sends relevant source to hosted TypeSafe models for analysis.
Do not substitute the separate MIT PR-Agent project for managed Qodo. Its local Git provider compares committed HEAD with a target branch and requires a clean working tree. Managed Qodo has its own pre-PR skills and integrations.
Qodo: Managed Qodo supports English compliance instructions and team rules; separate PR-Agent supports repository configuration. Qodo rule documentation.
Perch stores English ensure rules in perch.yaml or .perch/rules/. Project, file and method scopes determine what is checked. Run the named check after an edit and after the repair; a rule finding can fail the command and a CI gate. Perch rules · Working-file checks.
Compare Qodo's billing unit and Perch's usage estimate
Qodo: Commercial Qodo service; PR-Agent is a separate MIT community project. Qodo product or license source.
Perch’s CLI is MIT-licensed; hosted model inference is a separate paid service included in its published check rate. It does not run the model offline. Unchanged requests can reuse cached answers for free. Fresh judgments can vary, and a passing requirement check does not prove application correctness. Perch MIT license.
Qodo offers managed rules, compliance and pre-PR review integrations. PR-Agent is a separate MIT community project, with its own configuration and committed-change local provider; it is not the managed Qodo free tier.
npm install -g @lakeday/perchperch rules add refund-once \
--where refund.py --each method \
--ensure "Refunded orders cannot be refunded again."The captured rule checks the requirement shown above. Rule syntax and selectors
perch check refund.py::refund --rules refund-onceRun the check after an edit and after the fix. Working-tree check documentation
Use perch scan for repository code at Git HEAD and changed-code CI checks for pull requests. New model judgments can vary. Repeatability comes from cached answers for unchanged requests; a pass does not prove application correctness.
Choose Perch when you want an MIT CLI, English behavior rules and usage pricing that stays independent of team size. Give your coding agent a saved check it can run after every relevant edit.
Install PerchPublished by Perch. Vendor facts were reviewed on 2026-10-14; plans and allowances can change. Vendor marks belong to their owners.