Side by side
AFL++ vs Jazzer
Both stand on fuzz testing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan AndroidLinuxMac+2
AFL++ offers multiple instrumentation modes and target types, with free use under AGPL terms. Consider its hardware demands, macOS limitations, and license obligations before choosing a workflow.
Visit AFL++ Free plan Open source APILinuxMac+2
Jazzer combines coverage-guided fuzzing with JUnit integration and security-focused sanitizers for JVM targets. Its listed platform support and JUnit version requirement are worth checking against a project’s setup.
Visit JazzerThe facts
| AFL++ | Jazzer | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Android, Linux, Mac, Self-hosted, Windows | API, Linux, Mac, Self-hosted, Windows |
| Lowest paid plan | Commercial license: €20,000 a year | Free or on request |
| Plans published | 2 | 2 |
| Maker | AFL++ | Not published |
| Website | github.com | github.com |
| On fuzz testing software | #2 of 26 | #1 of 26 |
AFL++: what it does well
- Supports source-available and binary-only targets.
- Documents fuzzing for network services and GUI programs.
- Docker image supports x86_64 and arm64.
- Coverage-guided mutation checks for new execution paths.
What to know first
- Fuzzing can consume substantial memory or disk.
- Some listed modes do not work on macOS.
- Linux installation recommends LLVM 18 or newer.
- Modified network services have AGPL source-offer obligations.
Jazzer: what it does well
- JUnit integration supports fuzz tests alongside unit tests.
- Built-in sanitizers flag several Java security issues.
- Works with Maven, Gradle, and Bazel.
- Supports Linux, macOS, and Windows.
- Free under Apache-2.0.
What to know first
- JUnit integration requires JUnit 5.9.0 or newer.
- Windows support is limited to x86_64.
- macOS support requires version 12 or later.