Kodus alternative with an MIT CLI and included model pricing

Catch the fix an agent removes later.

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

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

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 Kodus's detection rate.

Perch vs Kodus: what your team runs.

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.

Kodus alternative with an MIT CLI and included model pricing

Kodus also offers a public CLI, a free BYOK community product and saved rules. Choose Perch for named project, file and method requirements with hosted analysis included in the published fresh-check rate, and free reuse of unchanged cached answers.

Review before committing

Kodus: CLI checks uncommitted, staged, branch and commit changes. Kodus 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.

How do saved requirements differ?

Kodus: English Kody Rules; Community includes 10 rules. Kodus 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.

What does the review bill depend on?

Compare Kodus's billing unit and Perch's usage estimate

Is the CLI open source and offline?

Kodus: Public CLI describes an MIT license; backend core is AGPLv3 with enterprise exceptions. Kodus 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.

When does Kodus fit the workflow?

Kodus has a public CLI that describes an MIT license, an AGPL backend core and a free BYOK option. Its hosted seats and model-provider tokens are separate charges; inspect the exact CLI and backend versions when evaluating licensing.

Estimate the review bill

Perch and Kodus: pricing, allowances and workload calculator

Make the agent check its next edit.

npm install -g @lakeday/perch

perch rules add refund-once \
  --where refund.py --each method \
  --ensure "Refunded orders cannot be refunded again."

perch check refund.py::refund --rules refund-once

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.