Open-source Java tools for decompiling bytecode and debugging class files.
Product memo
Javadecompiler offers Java developers a unified suite of open-source tools for bytecode decompilation. It integrates multiple engines like JD-Core, Fernflower, Procyon, and JADX, allowing inspection and debugging of class files without source code. The project provides a desktop GUI, an Eclipse plugin, and a Transformer API for programmatic access, simplifying a core developer job.
For who
Java developers and software engineers
Solves what
Decompiling Java bytecode and debugging class files without source code.
- Multiple decompiler support
- IDE integration
- Unified API access
In their own words
JD-GUI-DUO
A 2-in-1 Java decompiler based on JD-Core v0 and v1 supporting 3rd party decompilers CFR, Procyon, Fernflower, Vineflower and JADX via the Transformer API.
Commercial cues
Model
free only
Free tier
Yes
Trial
No
Pricing Strategy
Javadecompiler offers a free Jd-Gui-Duo tier; paid plan details are not publicly priced.
- • All tools are free, leveraging open-source for broad distribution.
- • Focuses on utility and community contribution over direct monetization.
- • No paid tiers or services are offered, removing adoption friction.
Operator context
Operating setup
Team
Indie / lean
LLM classification
Founded
May 2026
Platform
Web app
Audience
Developers
Social footprint
Builder Strategy
- Strategy Type
- Open Source Commercial
- Stage
- Bootstrapped Lean
- Effort
- Solo Buildable
About Javadecompiler Expand
Javadecompiler provides a critical toolkit for Java developers and software engineers who need to decompile Java bytecode and debug class files without access to original source code. The project integrates several leading decompilation engines, including JD-Core v0/v1, CFR, Procyon, Fernflower, Vineflower, and JADX, through its Transformer API.
This allows users to compare output from different decompilers. Available as the JD-GUI-DUO desktop application and an ECD++ Eclipse plugin, it serves as a broad, free, and open-source utility that simplifies complex bytecode analysis tasks.