CFR vs Relyze

CFR is a free Java decompiler that reconstructs Java source from Java class files. It can process individual named classes, classes found on a classpath, or a whole JAR, and the command-line tool can place output in a chosen directory with the --outputdir option. Decompilation behavior can be adjusted through command-line options or an options file. The maker says CFR handles many features from Java 9, 12, and 14, and it can attempt class files from other JVM languages; those are rendered as Java rather than their original language. CFR is written in Java 6 and is said to run wherever Java 6 does. It is available as a downloadable JAR, through Maven, and from GitHub. The FAQ notes an API from version 0.135, and the project repository identifies the license as MIT. CFR handles bytecode rather than native code. Its maker also notes that some inputs fall into edge cases where output may be poor. There are no paid plans or usage limits stated.

Relyze is a Windows application for disassembling, decompiling and comparing native-code software. It analyzes PE and ELF binaries, object files and object archives for x86, x64, ARM32, including Thumb mode, and ARM64 (AArch64). Its decompiler produces high-level pseudocode and lets users rename or retype variables and follow variable references. Binary diffing compares binaries and pseudocode to show similarities, differences, and functions that were changed, removed or added. Interactive control-flow, call and reference graphs support investigation alongside automatic function and data-type analysis. Batch analysis handles multiple files in parallel and can tag and archive them or run custom plugins. A Ruby plugin framework and command-line support fit into existing toolchains; symbol imports include PDB, COFF, STAB, TDS and MAP. The product page describes binary diffing for patch analysis and malware-variant analysis. The free Relyze plan costs nothing. The download page lists Windows, at least 4 GB of memory and 300 MB of disk space as requirements.