Freedom251 › Code Obfuscation Software
Zelix KlassMaster
What Zelix KlassMaster is
Zelix KlassMaster is a desktop Java bytecode obfuscation tool designed to make reverse-engineered source code less useful and protect applications from decompilation and reverse engineering. It provides flow, exception, name, reference, method parameter, string, integer, and long obfuscation or encryption. Name obfuscation shortens package, class, field, and method names, while Trim removes unused classes, fields, and methods. ZKM Script can automate processing in a build cycle, alongside a GUI and build tool interface. AutoReflection handles complicated Java Reflection API calls, and Smart Save helps manage JAR, resource, and Enterprise Java Beans deployment descriptor files. The product processes bytecode compiled for Java 1.1 through Java 27, including modules, and runs on environments with Java 8 or later. Windows, Linux, and macOS are listed. Android support covers obfuscating Java class files before APK conversion. Pricing is paid, with a 30-day trial and licenses from $290 per license.
Who it suits
Zelix KlassMaster suits Java developers protecting desktop, server, or Android applications through bytecode transformation. Its scripting and build interfaces fit teams incorporating obfuscation into build processes.
What it does well
- Supports Java 1.1 through Java 27 bytecode
- Includes control-flow and string obfuscation
- Automates builds with ZKM Script
- Runs on Windows, Linux, and macOS
- Supports Android class-file obfuscation
What to know first
- No free plan
- Evaluation license lasts 30 days
- Evaluation version limits flow obfuscation
- Commercial licenses are one-computer terms
Limits
The evaluation license is for one computer and 30 days, and its flow obfuscation affects only one or two methods in each class. A standard commercial license is for one computer, while other listed plans define machine or site limits.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| 2 machine multi-license | Per license purchase · 2 machines | $1,025, paid once |
| 3 machine multi-license | Per license purchase · 3 machines | $1,318, paid once |
| 4 machine multi-license | Per license purchase · 4 machines | $1,610, paid once |
| 5 machine multi-license | Per license purchase · 5 machines | $1,900, paid once |
| Site license | Per license purchase · Any number of machines at one physical location | $2,195, paid once |
| Small Developer | Per license · One machine · organization of no more than two people, including employees or contractors in the prior 12 months | $290, paid once |
| Standard | Per license · One machine · organizations of three or more people, or with three or more employees or contractors in the prior 12 months | $585, paid once |
As zelix.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Zelix KlassMaster website
- Start the 30-day evaluation on one computer
- Install it on Windows, Linux or macOS with Java 8 or later
- Use the GUI, build interface or ZKM Script
- Invoke it from a build through the command-line interface
Verdict
Zelix KlassMaster focuses on extensive Java bytecode protection, with scripting, reflection handling, and packaging support. Its paid licensing and evaluation limits should be considered before adopting it.
Questions
How much does Zelix KlassMaster cost?
The pricing note says From $265 with a 30-day trial. Listed plans include Small Developer at $290 per license, once, and Standard at $585 per license, once.
Is there a free plan?
No. The product has a 30-day trial.
Which operating systems are supported?
The vendor lists tested Windows, Linux and macOS environments, with Java 8 or later required.
Does it support Android?
Yes. Its FAQ describes obfuscating Java class files before they are converted into an APK.
What Java versions can it process?
It processes bytecode compiled for Java 1.1 through Java 27, including modules.
Can it integrate with builds?
ZKM Script, a build tool interface and a generic Java API support build integration; a basic Gradle plugin is also provided.
Facts from Zelix KlassMaster's own pages
- Android
- The FAQ says Zelix KlassMaster supports Android by obfuscating Java class files before they are converted into an APK. · zelix.com, 9 Oct 2026
- Automation
- ZKM Script can automate obfuscation and integrate it into a build cycle, and the product also has a GUI and build tool interface. · zelix.com, 9 Oct 2026
- Build integrations
- The vendor provides a basic Gradle plugin and documents calling Zelix KlassMaster through a generic Java API; newer Gradle versions may cause failures due to bytecode instrumentation. · zelix.com, 9 Oct 2026
- Evaluation limit
- The evaluation license is for one computer and 30 days, and the evaluation version flow-obfuscates only one or two methods in each class. · zelix.com, 9 Oct 2026
- Java compatibility
- The product can process bytecode compiled for Java 1.1 through Java 27, including modules. · zelix.com, 9 Oct 2026
- License terms
- A standard commercial license is perpetual, non-exclusive, and non-transferable for use on one computer. · zelix.com, 9 Oct 2026
- Obfuscation features
- Features include flow, exception, name, reference, method parameter, string, integer, and long obfuscation or encryption. · zelix.com, 9 Oct 2026
- Privacy and security
- The privacy policy says Zelix uses reasonable measures to protect personal information but cannot guarantee absolute security; it also says it does not sell or rent personal information. · zelix.com, 9 Oct 2026
- Purpose
- Zelix KlassMaster obfuscates Java code to make reverse engineered source code less useful and protect it from decompilation and reverse engineering. · zelix.com, 9 Oct 2026
- Reflection and packaging
- AutoReflection handles complicated Java Reflection API calls, and Smart Save simplifies handling JAR, resource, and Enterprise Java Beans deployment descriptor files. · zelix.com, 9 Oct 2026
- Runtime platforms
- The vendor says the Java-based product should run on platforms with a Java 8 or later virtual machine and lists tested Windows, Linux, and macOS environments. · zelix.com, 9 Oct 2026
- Size reduction
- Name obfuscation reduces package, class, field, and method name sizes, while Trim removes unused classes, fields, and methods. · zelix.com, 9 Oct 2026
- Support
- Technical support directs users first to the FAQ and online documentation, then to email support with product version, JVM, operating system, and error details where applicable. · zelix.com, 9 Oct 2026
Where Zelix KlassMaster stands on Freedom251
- Code Obfuscation Software#27 of 34