AFL++

6.8easy start · #38 of 78
in Game Mod Managers

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Android, Linux, Mac, self-hosted, Windows. Paid plans from €1666.67/mo.

AFL++ is ranked #38 of 78 in game mod managers on The Geeks Club, made by AFL++. It runs on Android, Linux, macOS, Self-hosted, Windows. There is a free plan. Paid plans start at €1666.67/mo.

AFL++ plans and pricing

All plans

AGPL-3.0-or-later Free Use, study, modify, and distribute under AGPL terms · modified network services must offer corresponding source github.com · 28 Sept 2026

Commercial license €20,000/yr Donation to EFF or CCC; license lasts one year and can be renewed by donating again For organizations that cannot or do not want to comply with AGPL · proof of donation must be emailed github.com · 28 Sept 2026

Compared on game mod managers

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
Execution mode: local
Supported languages: C, C++, Python, Rust
CI/CD support: Yes

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The record

Purpose: AFL++ is a coverage-guided fuzzer that mutates input and checks whether it reaches a new path in the target binary.
Compiler instrumentation: Its central afl-cc compiler supports LTO, LLVM, and GCC_PLUGIN instrumentation modes.
Mutation and coverage: The project lists collision-free coverage, AFLfast++ power schedules, MOpt mutators, laf-intel, and redqueen among its features.
Build modes: Build targets include source-only fuzzing, binary-only fuzzing, or a distribution build with both.
Container image: The project provides a Docker image for x86_64 and arm64, with the target source mounted at /src in its example command.
Linux requirements: The installation guide recommends LLVM 18 or newer and gives LLVM 14 as the minimum.
macOS support: The guide documents building on macOS x86_64 and arm64, but says afl-clang-lto, afl-gcc-fast, and qemu_mode do not work there.
License obligations: The combined afl-fuzz program is AGPL as a whole, and modified versions offered as network services must offer users the corresponding source.
License exceptions: Individual source files marked Apache-2.0 may be reused under that license, while bundled third-party components retain their own licenses.
Hardware and storage limits: The project warns that fuzzing can strain hardware, consume large amounts of memory or disk, and generate heavy filesystem I/O.
Support: The maintainers direct users to GitHub issues for AFL++ defects, the FAQ and best practices, and the Fuzzing Zulip server.
Release channels: The stable branch is described as the stability-focused default, while dev is bleeding edge and may fail to compile or contain bugs.
Founded: 2019
Price from: €1666.67/mo

Where it ranks on The Geeks Club

Best Game Mod Managers in 2026#38 of 78
Best Fuzz Testing Software in 2026#4 of 27
Best Stream Processing Software in 2026#5 of 24

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Sources

github.com/AFLplusplus/AFLplusplus/blob/stable/doc· checked 28 Sept 2026
github.com/AFLplusplus/AFLplusplus· checked 28 Sept 2026
github.com/AFLplusplus/AFLplusplus/blob/stable/doc· checked 28 Sept 2026
github.com/AFLplusplus/AFLplusplus/blob/stable/LIC· checked 28 Sept 2026