Procyon
Procyon: A capable free Java decompiler for developers who need code and bytecode APIs. Ranked #16 of 24 in Decompiler Software by our editors (7.0/10); pricing: Free plan; best for programmable Java decompilation.
At a glance
- Editor score7.0 / 10
- PricingFree plan
- Best forProgrammable Java decompilation
- Free planYes
- Paid fromFree
- Native-code decompilationNo
- Facts checked20 Sep 2026
Where it wins
- Free, open-source Java decompilation
- Java, raw bytecode, and AST output
- CLI and programmatic API support
Where it doesn't
- Focused on Java rather than native code
- No verified debugger, plugins, or integrations
- The decompiler is described as experimental
Our verdict on Procyon
Procyon is an open-source suite of Java metaprogramming tools centered on decompiling Java bytecode into Java source. It is suited to developers working with class files, JAR files, Java types, bytecode analysis, reflection, and code generation. The decompiler can run as a standalone JAR or through a Java API, making it relevant for both command-line workflows and applications that need programmable access to decompilation results.
Its main strength is output and API flexibility. Procyon supports Java source, raw bytecode, and bytecode AST output, while accepting class-file and JAR inputs. The published feature set includes handling for lambdas, annotations, records, switch expressions, and sealed types. Beyond decompilation, the toolkit includes reflection and runtime code-generation APIs, expression trees, and experimental compiler tooling. These capabilities make it more useful for program analysis and metaprogramming than a tool limited to source reconstruction.
Procyon is available as free open-source software, with no paid tier described in its published project details. That model fits developers who want a focused Java tool they can invoke from the command line or integrate through code. Its scope is narrower than a broader reverse-engineering environment: native code is outside its stated focus, and no verified debugger, plugin system, or integrations are part of the listed offering. The decompiler is also described as experimental, with v0.6.0 shown as the latest release. Choose Procyon for programmable Java bytecode work; choose another category tool when debugging, ecosystem integrations, or native-code support is central.
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Procyon pricing
Procyon fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Native-code decompilation | No |
| Bytecode decompilation | Yes |
| Debugger integration | Not verified |
| Scripting API | Yes |
| Plugin support | Not verified |
| License type | Not verified |
| Deployment | Desktop |
| Support | Docs, Community |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Procyon
- GhidraA free, broad toolkit for native-code, Java, and DEX analysis.9.4
- Binary NinjaA broad native reverse-engineering toolkit with perpetual paid licenses and a free plan.9.2
- IDA ProA deep native reverse-engineering suite for teams that need broad architecture support.9.0
See all Procyon alternatives →
Also Ranked In
Procyon is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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