Best Csmith Alternatives in 2026
Updated
20 platforms from fuzz testing software ranked against Csmith on the same published basis.
- 1Csmith vs Mayhem
- 2Csmith vs cargo-fuzz
- 3Csmith vs ClusterFuzz
- 4Csmith vs AFL++
- 5Csmith vs Jazzer
- 6Csmith vs Accessibility Test Framework for Android
- 7Csmith vs Fuzzilli
- 8Csmith vs OSS-Fuzz
- 9Csmith vs Schemathesis
- 11Csmith vs Roslynator
- 12Csmith vs Black Duck Coverity
- 13Csmith vs boofuzz
- 14Csmith vs Honggfuzz
- 15Csmith vs Onyx Launcher
- 16Csmith vs syzkaller
- 17Csmith vs FuzzForge
- 18Csmith vs Scout Suite
- 19Csmith vs Fortra ZTNA
- 20Csmith vs Fuzzinator
- 21Csmith vs Fuzzware
Csmith alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Mayhem | 7.9 | Free plan | $236/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 2 | cargo-fuzz | 7.4 | Free plan | Free | Linux, Mac, Windows |
| 3 | ClusterFuzz | 7.4 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 4 | AFL++ | 7.3 | Free plan | €1666.67/mo | Android, Linux, Mac, self-hosted, Windows |
| 5 | Jazzer | 7.2 | Free plan | Free | Linux, Mac, Windows |
| 6 | Accessibility Test Framework for Android | 7.1 | Free plan | Free | Android, Linux, Mac, Windows |
| 7 | Fuzzilli | 7.0 | Free plan | Free | Linux, Mac, self-hosted |
| 8 | OSS-Fuzz | 7.0 | Free plan | Free | Web |
| 9 | Schemathesis | 7.0 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 11 | Roslynator | 6.8 | Free plan | Free | Browser, Linux, Mac, Windows |
| 12 | Black Duck Coverity | 6.5 | No | — | Linux, Mac, self-hosted, Web, Windows |
| 13 | boofuzz | 6.3 | Free plan | Free | API, Linux, self-hosted, Windows |
| 14 | Honggfuzz | 6.2 | No | — | Android, Linux, Mac, Windows |
| 15 | Onyx Launcher | 6.0 | No | — | Windows, Linux |
| 16 | syzkaller | 6.0 | No | — | Linux, Mac, Windows |
| 17 | FuzzForge | 5.9 | No | — | self-hosted, Web |
| 18 | Scout Suite | 5.9 | No | — | Mac, Linux |
| 19 | Fortra ZTNA | 5.8 | No | — | Web |
| 20 | Fuzzinator | 5.8 | No | — | Linux, Mac |
| 21 | Fuzzware | 5.8 | No | — | Linux |
Make your platform an alternative to Csmith
See the priceThe sponsored alternative slot on this page is labelled Sponsored.
Questions about Csmith alternatives
What is the best alternative to Csmith?
Mayhem, number 1 in fuzz testing software with a score of 7.9 out of 10. The others here: cargo-fuzz, ClusterFuzz, AFL++ and 16 more.
What is the best free alternative to Csmith?
Mayhem is the best-ranked alternative with a free plan. 11 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.