Best free Code Review & Security for vibe coders
Summary
5 of 5 tracked Code Review & Security tools have a free plan. Highest-scoring free option in our agent tests: Semgrep (8.1/10). 1 of these free options have been tested so far.
Free-tier limits are copied from each tool's pricing page on the date shown. "Free" means a $0 plan exists, not that it fits every project. Last updated:
Tools with a free plan
| Tool | Free tier (as published) | Agent score | Checked |
|---|---|---|---|
| Semgrep | Yes: up to 10 contributors | 8.1 | 2026-10-16 |
| CodeRabbit | Yes: PR summaries; free reviews for public repos | Not yet tested | 2026-10-16 |
| Greptile | Yes (Starter): 1 active developer, unlimited repos, 50 credits/mo; free for qualified OSS | Not yet tested | 2026-10-16 |
| Snyk | Yes: free plan with monthly test limits | Not yet tested | 2026-10-16 |
| Sourcery | Yes: free for open-source repos | Not yet tested | 2026-10-16 |
Full Code Review & Security ranking · All free-tool guides · Methodology
Scores come from our own tests and are never for sale; sponsored placements are always labelled. We may use affiliate links in future. Disclosure