Best Java Decompiler Online Alternatives & Competitors in 2026
Top picks: Attify Offensive IoT Exploitation, Nightwing DejaVM, Zenyard RE Agent — plus 45 more compared.
Security OperationsTop picks: Attify Offensive IoT Exploitation, Nightwing DejaVM, Zenyard RE Agent — plus 45 more compared.
Security OperationsJava Decompiler Online is a free Offensive Security tool. Security professionals most commonly compare it with Attify Offensive IoT Exploitation, Nightwing DejaVM, Zenyard RE Agent, Boomerang Decompiler, and Shellcode2PE. All 48 alternatives are matched by shared capabilities, tags, and NIST CSF 2.0 coverage.
A closer look at the 8 most relevant alternatives and competitors to Java Decompiler Online, including their key features and shared capabilities.
Private training course for IoT device pentesting and exploitation
Whole-system emulation environment for software dev, debugging, testing & security
AI agent for in-depth binary analysis and reverse engineering assistance.
An open source machine code decompiler that converts binary executables into readable C source code across multiple architectures and file formats.
A Python script that converts shellcode into a PE32 or PE32+ file.
Charlotte is an undetected C++ shellcode launcher for executing shellcode with stealth.
PinCTF is a Python wrapper tool that uses Intel's Pin framework to instrument binaries and count instructions for reverse engineering analysis.
Assembler/disassembler for the dex format used by Dalvik, Android's Java VM implementation.
Private training course for IoT device pentesting and exploitation
Whole-system emulation environment for software dev, debugging, testing & security
AI agent for in-depth binary analysis and reverse engineering assistance.
An open source machine code decompiler that converts binary executables into readable C source code across multiple architectures and file formats.
A Python script that converts shellcode into a PE32 or PE32+ file.
Charlotte is an undetected C++ shellcode launcher for executing shellcode with stealth.
PinCTF is a Python wrapper tool that uses Intel's Pin framework to instrument binaries and count instructions for reverse engineering analysis.
Assembler/disassembler for the dex format used by Dalvik, Android's Java VM implementation.
PLCinject is a tool for injecting and patching blocks on PLCs with a call instruction.
A Java bytecode assembler and disassembler toolkit that converts classfiles to human-readable format and provides decompilation capabilities for reverse engineering Java applications.
angr is a Python-based binary analysis framework that provides disassembly, symbolic execution, and program analysis capabilities for cross-platform binary examination.
Fernflower is an analytical decompiler for Java with command-line options and support for external classes.
Dynamic instrumentation toolkit for developers, reverse-engineers, and security researchers.
A backend agnostic debugger frontend for debugging binaries without source code access.
ILSpy is the open-source .NET assembly browser and decompiler with various decompiler frontends and features.
JD-GUI is a graphical Java decompiler that reconstructs and displays source code from compiled ".class" files for reverse engineering and code analysis purposes.
SigThief extracts digital signatures from signed PE files and appends them to other files to create invalid signatures for testing Anti-Virus detection mechanisms.
steg86 is a steganographic tool that hides information within x86 and AMD64 binary executables without affecting their performance or file size.
A collection of setup scripts for various security research tools with installers for tools like afl, angr, barf, and more.
A VMware image for penetration testing purposes
UPX is a high-performance executable packer for various executable formats.
Collection of Windows oneliners for executing arbitrary code and downloading remote payloads.
Threat emulation tool for adversary simulations and red team operations
DNS reconnaissance tool checking DNS records, subdomains, and third-party svcs
Automated hardware reversing platform using robotics for embedded device analysis
FourCore ATTACK is an adversary emulation platform to manage cyber risk with evidence
Post-exploitation threat emulation platform for red team operations.
Red team toolkit for EDR evasion, initial access, and post-exploitation.
Bundled offensive security suites combining pen testing, red teaming, and VM.
AI agent platform for automating offensive security operations and evals.
AI-assisted vulnerability research and advanced offensive cyber tooling firm.
Offensive security firm offering AI pentesting, credential monitoring & compliance.
R&D firm providing cyber defense & operational tech for DoD and DHS.
Boutique security firm offering red team, OSINT, and adversary simulation services.
CLI cheatsheet for Red Specter's 30-tool offensive security platform.
MCP server enabling AI agents to autonomously run 150+ security tools
An AI-powered Google Dorking tool that helps create effective search queries to uncover sensitive information on the internet.
A specification/framework for extending default C2 communication channels in Cobalt Strike
An open-source framework that enables building and deploying AI security tools
GraphSpy is a browser-based post-exploitation tool for Azure Active Directory and Office 365 environments that enables token management, reconnaissance, and interaction with Microsoft 365 services.
An Android port of the Radamsa fuzzing tool compiled with Android NDK to support Android ABIs for security testing on mobile platforms.
A covert channel technique that uses WebDAV protocol features to deliver malicious payloads and establish C2 communication while bypassing security controls.
LinksDumper extracts links and endpoints from HTTP responses to support web application security testing and reconnaissance activities.
Common questions security professionals ask when evaluating alternatives and competitors to Java Decompiler Online.
The most popular alternatives to Java Decompiler Online include Attify Offensive IoT Exploitation, Nightwing DejaVM, Zenyard RE Agent, Boomerang Decompiler, and Shellcode2PE. These Offensive Security tools offer similar capabilities and are frequently compared by security professionals evaluating their options.
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