Best Fuzz Testing Software in 2026
Updated
In short: Mayhem is ranked #1 of 27 as of 4 October 2026, ahead of cargo-fuzz and ClusterFuzz. The best-ranked option with a free plan is cargo-fuzz. The lowest first paid tier on this page is Mayhem at $236/mo.
Fuzz testing tools exercise software with varied inputs, helping developers examine how programs behave across different conditions. To compare these options, look at input generation methods, supported languages, and target types, then consider execution mode and coverage guidance. Crash triage can affect how failures are handled, while CI/CD support may be relevant to your development workflow. Free-plan availability and paid-from pricing offer additional points of comparison. Mayhem, cargo-fuzz, and ClusterFuzz are among the named options; AFL++, Jazzer, and OSS-Fuzz are also included. The criteria give you a way to weigh testing approaches alongside language, workflow, and budget requirements.
27 fuzz testing software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Fuzz Testing Software, ranked on how quickly a newcomer can get going. 12 of the 25 on this page can be tried for free.
- 1 MayhemPaid from $236/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 2 cargo-fuzzFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 3 ClusterFuzzFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 4 AFL++Paid from €1666.67/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 5 JazzerFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 6 Accessibility Test Framework for AndroidFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 7 FuzzilliFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 8 OSS-FuzzFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 9 SchemathesisFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 10 CsmithFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 11 RoslynatorFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 12 Black Duck Coverity
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 13 boofuzzFree plan
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 14 Honggfuzz
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 15 Onyx Launcher
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 16 syzkaller
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 17 FuzzForge
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 18 Scout Suite
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 19 Fortra ZTNA
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 20 Fuzzinator
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 21 Fuzzware
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 22 Metalware
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 23 Netzob
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 Wfuzz
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 EvoMaster
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which fuzz testing software is ranked first on The Geeks Club?
Mayhem is ranked #1 of 27 with a score of 7.9. cargo-fuzz is second and ClusterFuzz third.
How many of these have a free plan?
12 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Mayhem has the lowest first paid tier we found: $236/mo.
How is this list ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.