# Code review & testing: the tools companies use

233 companies on usedby use at least one of the 7 tools in this category with a public customer. Sonar leads with 53 companies. Counts are of companies on usedby, not of the whole market. Latest check 2026-10-09: 242 of 242 public lines checked.

> AI that reviews pull requests, checks code quality and writes, runs and maintains tests.

Family: [Software engineering](https://www.usedby.ai/tools/category/software-engineering.md)

## Ranking

Public customers count every public line, job-post signals included; ties share a rank.

| Rank | Tool | Public customers | Confirmed | Observed | Signals |
|---|---|---|---|---|---|
| 1 | [Sonar](https://www.usedby.ai/tools/sonar.md) | 53 | 3 | 49 | 1 |
| 2 | [CodeRabbit](https://www.usedby.ai/tools/coderabbit.md) | 50 | 24 | 26 | 0 |
| 3 | [mabl](https://www.usedby.ai/tools/mabl.md) | 41 | 19 | 22 | 0 |
| 4 | [QA Wolf](https://www.usedby.ai/tools/qa-wolf.md) | 39 | 26 | 13 | 0 |
| 5 | [Greptile](https://www.usedby.ai/tools/greptile.md) | 25 | 9 | 16 | 0 |
| 6 | [Momentic](https://www.usedby.ai/tools/momentic.md) | 24 | 10 | 14 | 0 |
| 7 | [Qodo](https://www.usedby.ai/tools/qodo.md) | 10 | 0 | 10 | 0 |

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Source: https://www.usedby.ai/tools/category/code-review-testing · How we check: https://www.usedby.ai/methodology