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Head-to-head · Fuzz Testing Software

EvoMaster vs syzkaller

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score EvoMaster #5 in Fuzz Testing Software 8.5/10 Free plan Free plan✓ 0 of 3 features Visit EvoMaster
syzkaller #8 in Fuzz Testing Software 8.1/10 Open source ✓ 3 of 3 features Visit syzkaller

EvoMaster leads on 0 checks, syzkaller 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 scoreEvoMaster · 8.5/10
  • Free planonly EvoMaster
  • Most featuressyzkaller · 3 of 3

EvoMaster scores higher on our rubric for fuzz testing software: 8.5 against 8.1 out of 10; our editors rank them #5 and #8.

EvoMaster is the better fit for API teams testing REST, GraphQL, and RPC. syzkaller is the better fit for operating-system kernel fuzzing.

  • EvoMaster fits best

    API teams testing REST, GraphQL, and RPC

  • syzkaller fits best

    Operating-system kernel fuzzing

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Side by side

Feature EvoMaster 8.5/10 Visit ↗ syzkaller 8.1/10 Visit ↗
At a glance
Editor score 8.5 8.1
Ranking #5 in Fuzz Testing Software #8 in Fuzz Testing Software
Best for API teams testing REST, GraphQL, and RPC Operating-system kernel fuzzing
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Self-hosted, Desktop Self-hosted
Platforms Windows, macOS, Linux Linux, Windows, macOS
Support Community, Docs Community, Docs
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features EvoMaster 0/3 · syzkaller 3/3
Coverage guidance Not checked yet ✓ (best)
Crash triage Not checked yet ✓ (best)
CI/CD support Not checked yet ✓ (best)
Specs
Input generation methods Not checked yet generation, mutation
Target types Not checked yet operating-system kernels and syscall interfaces: FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, Windows
Execution mode Not checked yet Local
Supported languages Not checked yet Not checked yet
Our review
Pros
  • Supports REST, GraphQL, gRPC, and Thrift API testing
  • Generates tests in Python, JavaScript, Java, and Kotlin
  • Combines authentication, database data generation, and reporting
  • Generates and mutates syscall programs with coverage guidance
  • Runs against virtual machines or physical devices
  • Reproduces, minimizes, stores, and deduplicates kernel crashes
Cons
  • White-box testing is focused on JVM applications
  • Database generation centers on four supported database systems
  • Continuous integration integration is provided through GitHub Actions
  • Focused on operating-system kernels rather than general application fuzzing
  • Requires teams able to build and instrument target kernels
  • Local execution may demand kernel and device infrastructure
Our verdict

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 →

syzkaller is an open-source, unsupervised coverage-guided fuzzer for operating-system kernels. It generates and mutates syscall programs, executes them through virtual machines or physical devices, collects kernel code coverage, and…

Read the review →
  1. EvoMasterFuzz Testing Software 8.5Free plan
  2. syzkallerFuzz Testing Software 8.1Open source

Strengths and trade-offs

  • 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

  • syzkaller — where it wins

    • Generates and mutates syscall programs with coverage guidance
    • Runs against virtual machines or physical devices
    • Reproduces, minimizes, stores, and deduplicates kernel crashes

    Where it doesn't

    • Focused on operating-system kernels rather than general application fuzzing
    • Requires teams able to build and instrument target kernels
    • Local execution may demand kernel and device infrastructure

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