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Head-to-head · Fuzz Testing Software

ClusterFuzz vs EvoMaster

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score ClusterFuzz #3 in Fuzz Testing Software 8.9/10 Open source ✓ 3 of 3 features Visit ClusterFuzz
EvoMaster #5 in Fuzz Testing Software 8.5/10 Free plan Free plan✓ 0 of 3 features Visit EvoMaster

ClusterFuzz leads on 0 checks, EvoMaster on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreClusterFuzz · 8.9/10
  • Free planonly EvoMaster
  • Most featuresClusterFuzz · 3 of 3

ClusterFuzz scores higher on our rubric for fuzz testing software: 8.9 against 8.5 out of 10; our editors rank them #3 and #5.

ClusterFuzz is the better fit for organizations needing managed fuzzing infrastructure. EvoMaster is the better fit for API teams testing REST, GraphQL, and RPC.

  • ClusterFuzz fits best

    Organizations needing managed fuzzing infrastructure

  • EvoMaster fits best

    API teams testing REST, GraphQL, and RPC

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Side by side

Feature ClusterFuzz 8.9/10 Visit ↗ EvoMaster 8.5/10 Visit ↗
At a glance
Editor score 8.9 8.5
Ranking #3 in Fuzz Testing Software #5 in Fuzz Testing Software
Best for Organizations needing managed fuzzing infrastructure API teams testing REST, GraphQL, and RPC
Pricing model Free Free
Starting price Open source Free plan
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Cloud, Self-hosted Self-hosted, Desktop
Platforms Web, Windows, macOS, Linux Windows, macOS, Linux
Support Docs, Community Community, Docs
Integrations 5 integrations 2 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features ClusterFuzz 3/3 · EvoMaster 0/3
Coverage guidance ✓ (best) Not checked yet
Crash triage ✓ (best) Not checked yet
CI/CD support ✓ (best) Not checked yet
Specs
Input generation methods mutation, generation, hybrid Not checked yet
Target types binary formats, HTML, JavaScript, browser DOM, native programs Not checked yet
Execution mode Hybrid Not checked yet
Supported languages C, C++, Rust; potentially other LLVM-based languages Not checked yet
Our review
Pros
  • Combines libFuzzer, AFL++, Honggfuzz, and black-box fuzzing
  • Automates crash triage, deduplication, minimization, and issue filing
  • Supports coverage management, regression bisection, and scheduled bots
  • Supports REST, GraphQL, gRPC, and Thrift API testing
  • Generates tests in Python, JavaScript, Java, and Kotlin
  • Combines authentication, database data generation, and reporting
Cons
  • Requires organizations to operate the fuzzing infrastructure
  • Cloud deployment can introduce usage costs outside the license
  • Best fit is technical teams running continuous fuzzing programs
  • White-box testing is focused on JVM applications
  • Database generation centers on four supported database systems
  • Continuous integration integration is provided through GitHub Actions
Our verdict

ClusterFuzz is open-source fuzzing infrastructure from Google for development and security teams that need to operate continuous testing programs. It supports coverage-guided fuzzing with libFuzzer, AFL++, and Honggfuzz, alongside…

Read the review →

EvoMaster is an open-source tool for automatically generating system-level tests and fuzzing web and enterprise applications. It is aimed at API teams working with REST, GraphQL, and RPC interfaces, including gRPC and Thrift. Its black-box…

Read the review →
  1. ClusterFuzzFuzz Testing Software 8.9Open source
  2. EvoMasterFuzz Testing Software 8.5Free plan

Strengths and trade-offs

  • ClusterFuzz — where it wins

    • Combines libFuzzer, AFL++, Honggfuzz, and black-box fuzzing
    • Automates crash triage, deduplication, minimization, and issue filing
    • Supports coverage management, regression bisection, and scheduled bots

    Where it doesn't

    • Requires organizations to operate the fuzzing infrastructure
    • Cloud deployment can introduce usage costs outside the license
    • Best fit is technical teams running continuous fuzzing programs

  • EvoMaster — where it wins

    • Supports REST, GraphQL, gRPC, and Thrift API testing
    • Generates tests in Python, JavaScript, Java, and Kotlin
    • Combines authentication, database data generation, and reporting

    Where it doesn't

    • White-box testing is focused on JVM applications
    • Database generation centers on four supported database systems
    • Continuous integration integration is provided through GitHub Actions

More comparisons

All fuzz testing software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update