CodeRabbit provides tracked-change review with explicit uncommitted and untracked flags. Macroscope freezes branch changes, including work in progress, in an isolated temporary worktree by default. The useful difference is the review input and isolation model, alongside their different billing meters.
| Decision | CodeRabbit | Macroscope |
|---|---|---|
| Review scope | Pull requests, local changes, and agent-loop review. | GitHub reviews and local or agent-driven checks. |
| Local review input | CLI and IDE review committed and uncommitted changes. | MIT local CLI reviews working-tree and branch changes. |
| Custom requirements | Guideline files and natural-language pre-merge checks; custom-check allowances depend on plan. | Markdown agent instructions, path selection and configurable check-run agents. |
| License and service | Commercial review service. | MIT local CLI; commercial hosted analysis. |
| Official references | CodeRabbit sources | Macroscope sources |
Include an unstaged repair and an untracked helper in the trial. Verify the exact files each command reads. Compare CodeRabbit local-review allowances with Macroscope CLI Agent usage; Macroscope GitHub per-KB pricing is a separate meter.
Essentials: $24/user/month billed annually, or $30 monthly. Public-repository reviews are free.
Essentials annual subscription floor; 1 repository and 5 included reviews/developer/hour. Eligible extra reviews cost 25¢ per reviewed file. Built-in checks are included; custom pre-merge checks start on Team.
GitHub Balanced review: 5¢/KB with a 10 KB minimum. Other modes: 2.5–20¢/KB. No seat fees.
GitHub diff-size pricing is separate from CLI/agent model cost plus 5%. Free monthly credits and welcome credit are available. No fixed per-PR total is assumed.
Subscription amounts are plan floors or quoted allowances. Repeated reviews, selected effort, provider charges and exclusions can change the bill. Equal review counts do not establish equal analysis scope.
A third option for the agent’s next edit
Both competitors can review local changes. Prefer Perch when the task is narrower: apply a saved project, file or method requirement and repeat precisely that check after the fix.
For an agent that repeatedly removes tenant authorization from a database update, save the requirement as a named Perch rule:
- name: tenant-scoped-update
where: "orders.py"
ensure: >-
The cancellation UPDATE must constrain tenant_id to actor.tenant_id
before changing the order. An id-only or owner-only update breaks
this requirement.This requirement comes from the FastAPI tenant-authorization recipe, which includes the implementation, deliberate regression and captured Perch checks. The same named check can run against the working file after the next agent edit. Perch working-file checks support selecting rules directly; rule selectors cover project, file and method scope.
npm install -g @lakeday/perch
perch login
perch setup claude-code
# Or choose: perch setup codex
# Or choose: perch setup cursorUse the setup command for your coding agent. Download the focused pack without replacing existing files:
curl -fL 'https://reporules.fyi/fastapi/tenant-cancellation/rule-pack.zip' -o tenant-rule.zip
unzip -n tenant-rule.zip
perch check orders.py --rules tenant-scoped-update --json
# Repair the reported finding after the agent edit.
perch check orders.py --rules tenant-scoped-update --jsonKeep your existing root perch.yaml. The ZIP adds its focused rule under .perch/rules/; unzip -n preserves existing files. Review and adapt the selector and application path before running it in your repository. Run the saved check after an edit, repair any finding, and repeat the identical check alongside application regression tests.
Download the tenant-authorization rule pack · Inspect pack contents and agent task
Perch charges 10¢ per 1,000 fresh rule checks, with no developer seat fees. Cached unchanged checks are free. About 50¢ per mid-sized PR is a rounded estimate for approximately 150 methods read at the captured September–October 2026 density of 34 questions per method; the unrounded example is 51¢. A single named-rule check is a different scope. Team workload calculations show the assumptions.
The Perch CLI is MIT licensed; hosted analysis is paid and relevant source is sent to the configured model service. Fresh model judgments can vary. Unchanged requests can reuse cached results.
This article compares documented product workflows and terms. The public evaluation materials include captured Perch requirement checks; authenticated CodeRabbit and Greptile runs remain unscored. They do not establish a measured accuracy ranking between these tools.
Reviewed October 14, 2026. Unverified features are marked as unverified rather than treated as absent. Current terms and actual trial results should determine a purchase.