Best Fuzz Testing Software in 2026
Updated
In short: ClusterFuzz is ranked #1 of 27 as of 4 October 2026, ahead of Accessibility Test Framework for Android and AFL++. The best-ranked option with a free plan is Accessibility Test Framework for Android. The lowest first paid tier on this page is Mayhem at $236/mo.
Fuzz testing software explores inputs to help uncover faults in software. Compare the entries on input generation methods, supported languages, target types, and execution mode to see how their approaches differ. Coverage guidance and crash triage describe additional aspects of the fuzzing workflow, while CI/CD support, free plan availability, and paid-from pricing offer further points to weigh. The ranking begins with ClusterFuzz and Accessibility Test Framework for Android, followed by AFL++, cargo-fuzz, and Mayhem; Jazzer, Roslynator, and OSS-Fuzz are also among the early entries. Use the listed criteria to focus on the kinds of targets you want to test and the language and workflow details that fit your development needs.
27 fuzz testing software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 ClusterFuzz Top pick · 7.4 Free plan · Free
#2 Accessibility Test Framework for Android Runner-up · 7.3 Free plan · Free
#3 AFL++ Also great · 7.3 Free plan · €1666.67/mo- Free plan LinuxmacOSself-hostedWebWindows
- Input generation methods
- mutation, generation, hybrid
- Target types
- binary formats, HTML, JavaScript, browser DOM, native programs
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - Free plan AndroidLinuxmacOSWindows
- Input generation methods
- generation, mutation
- Target types
- operating-system kernels and syscall interfaces: FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, Windows
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - Free plan AndroidLinuxmacOSself-hostedWindows
- Free plan
- Yes
- Input generation methods
- mutation
- Target types
- source-code targets, binary-only targets, file inputs, stdin inputs, Android native libraries, Win32 PE binaries
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms€1666.67/mofirst paid tier About AFL++Visit site - Free plan LinuxmacOSWindows
- Input generation methods
- mutation, generation, hybrid
- Target types
- raw byte buffers, structured Rust data, libraries, APIs, compiler code, allocator operations
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - Free planFree trial apiLinuxmacOSself-hostedWebWindows
- Input generation methods
- hybrid
- Target types
- Linux binaries; Windows PE binaries; TCP/UDP applications; REST APIs; gRPC APIs; containers; automotive vECUs
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms$236/mofirst paid tier About MayhemVisit site - Free plan LinuxmacOSself-hosted
- Input generation methods
- mutation, generation, hybrid
- Target types
- JavaScript programs and JavaScript engines/interpreters
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - Free plan LinuxmacOSWindows
- Free plan
- Yes
- Input generation methods
- mutation, generation
- Target types
- JVM applications, Java, Kotlin, Scala, Clojure, JNI/native libraries
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - Free plan extensionLinuxmacOSWindowsRecognisedDocumentedFree planPlatforms
- Free plan LinuxmacOSself-hostedWindows
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms - Free plan Web
- Free plan
- Yes
- Input generation methods
- mutation
- Target types
- source-code fuzz targets; untrusted user or network inputs; complex input formats
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - LinuxmacOSself-hostedWebWindows
- Free plan
- No
RecognisedDocumentedFree planPlatforms - apiLinuxself-hostedWindows
- Free plan
- Yes
- Input generation methods
- hybrid
- Target types
- network protocols, serial, Ethernet/IP, UDP broadcast, TCP, UDP, SSL, raw sockets
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - AndroidLinuxmacOSWindows
- Input generation methods
- mutation
- Target types
- file inputs, standard input, APIs, binaries, network servers
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - WindowsLinux
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms - LinuxmacOSWindows
- Input generation methods
- generation, mutation
- Target types
- operating-system kernels and syscall interfaces: FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, Windows
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - WindowsLinux
- Free plan
- Yes
- Input generation methods
- generation
- Target types
- C programs; C++ programs; compilers
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Input generation methods
- generation
- Target types
- codebases, binaries, containers, APIs, GraphQL, protocols, firmware, embedded systems
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - LinuxWindows
- Free plan
- Yes
- Input generation methods
- mutation, generation
- Target types
- network protocols, structured files, text protocols, delimiter-based protocols, fixed-field protocols, variable-length/TLV protocols, IPC, drivers and devices
RecognisedDocumentedFree planPlatforms - macOSLinux
- Free plan
- Yes
- Input generation methods
- mutation
- Target types
- Network protocols and services including TCP, UDP, SSL, IPP, LPD, BACnet, Modbus, DHCP, TFTP, Telnet CLI, Netconf, COPS, and raw requests
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - WindowsmacOS
- Free plan
- Yes
- Input generation methods
- generation
- Target types
- HTTP URLs, paths, files, query parameters, POST data, cookies, headers, HTTP verbs, authentication
RecognisedDocumentedFree planPlatforms - Web
- Input generation methods
- generation
- Target types
- network protocols, file formats, hardware, DLLs, APIs, binary applications
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - LinuxmacOS
- Input generation methods
- generation, mutation
- Target types
- stdin, command-line, files, HTTP/browser
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - Linux
- Input generation methods
- mutation
- Target types
- ARM Cortex-M firmware; Infineon AURIX TriCore firmware; MMIO and interrupt-driven embedded systems
- Coverage guidance
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Input generation methods
- generation and mutation, with symbolic input generation
- Target types
- ELF and raw .bin firmware; ARM Cortex-M, embedded peripherals, DMA, RTOS, and bare metal targets
- Coverage guidance
- Yes
- Crash triage
- Yes
RecognisedDocumentedFree planPlatforms - WindowsmacOSLinux
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms
Is your app 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 Everything Xiaomi?
ClusterFuzz is ranked #1 of 27 with a score of 7.4. Accessibility Test Framework for Android is second and AFL++ third.
How many of these have a free plan?
10 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 what each maker publishes: documentation depth, a free tier and the platforms it runs on. Paid placements never change a rank.