# Perch vs Qodo: turn a repeated correction into a method check

Compare Perch’s saved requirement checks with Qodo and choose a workflow for recurring coding-agent mistakes.

Source: https://perchscan.com/compare/perch-vs-qodo/
Published: 2026-10-14

Perch makes a recurring requirement directly runnable against one edited method. The rule stays beside the code, so the next agent can check the same behavior instead of relying on the previous conversation.

## Check a saved rule on the current method

This is the same requirement and command used in the [captured refund example](/examples/plain-english-rules/):

```yaml
- name: refund-once
  where: checkout.py
  each: method
  ensure: Refunded orders cannot be refunded again.
```

The deliberately broken method calls the payment provider without checking the order status:

```python
def refund(order, payment):
    payment.refund(order.total)
    order.status = "refunded"
    return order
```

Run the focused check from the repository root:

```sh
perch check checkout.py::refund --rules refund-once --json
```

In the [September 20, 2026 capture](/demos/refund-capture.json), the unguarded refund was flagged at 80% confidence and exited 3. Adding `if order.status == "refunded": return order` before the payment call made the check pass and exit 0. The capture uses `refund.py`; use `checkout.py` when adapting the public [order-service source at commit 4af67af](https://github.com/lakeday-org/perch/blob/4af67af46d76ac99398d61c7ad0a45441760d4dc/test/fixtures/order-service/checkout.py).

Save the rule with the code, then use the same command to check the next agent edit. Add regression tests for concurrency and payment-provider idempotency in the application.


## Compare the review workflow

| Workflow | Perch | Qodo |
| --- | --- | --- |
| Rule authoring | `name`, `where`, and a plain-English `ensure` | Compliance objectives with success/failure criteria |
| Focused check | Choose a method and named rule in a CLI command | Documented compliance checks evaluate PR changes |
| Adoption | Add a requirement check beside existing tests | Use Qodo’s review, compliance, and improvement workflow |

## Make each correction a reusable method check

Perch turns a correction such as “refunded orders cannot be refunded again” into a named requirement beside the code. Give it a selector, write the requirement in English, and run it against the edited method. The next agent session and CI can use that same rule and command.

## How Qodo handles review

Qodo documents [custom compliance objectives](https://docs.qodo.ai/qodo-documentation/code-review/qodo-merge/features/custom-compliance), [repository configuration](https://docs.qodo.ai/qodo-documentation/code-review/get-started/configuration-overview/configuration-file), and [code improvement suggestions](https://docs.qodo.ai/qodo-documentation/qodo-merge/tools/tools-list/improve). Its compliance workflow uses objectives and success or failure criteria; Qodo also offers developer tools beyond pull request comments.

## Add Perch to your agent workflow

Follow the [Perch quick start](https://docs.perchscan.com/install/), then save the requirement with the code. Install the skill for the coding agent you use:

```sh
perch setup claude-code
# Or: perch setup codex
# Or: perch setup cursor
```

The Perch skill instructs the agent to check the named rule after each relevant edit, inspect the finding, repair the code, and recheck. Keep the rule and regression test beside the application so the next session can use the same requirement.

With your base reference fetched, add `perch scan --since origin/main --filter type=lint` beside your tests in CI. [CI setup](https://docs.perchscan.com/ci/) explains the changed-code scan. Gated findings exit 3; exits 1 and 2 mean the check did not complete.

## Compare cost and result limits

Perch charges 10¢ per 1,000 rule checks, with cached checks free. [The pricing comparison](/#pricing) estimates about 50¢ for a mid-sized pull request with about 150 methods read, including surrounding code. Usage follows the selected questions and their code context.

Unchanged requests reuse cached answers for free; fresh model judgments can vary. Perch’s CLI is MIT licensed. Model analysis sends relevant source to the configured service.

Competitor documentation reviewed October 14, 2026. [All comparisons](/compare/) · [Perch rule syntax](https://docs.perchscan.com/rules/)