Python Obfuscation Tools Comparison¶
A comprehensive comparison of Python code obfuscation tools to help you choose the right solution.
Quick Summary¶
| Tool | Price | Approach | Best For |
|---|---|---|---|
| pyobfus | Free / $45 Pro | AST transformation | Cross-platform Python distribution |
| PyArmor | Free trial / $89 Pro | Native runtime + encryption | Maximum protection (with complexity) |
| Oxyry | Online service | Name mangling | Quick one-off obfuscation |
| Cython | Free / $270/yr Commercial | Compile to C | Performance + obfuscation |
| Nuitka | Free / $270/yr Commercial | Compile to binary | Standalone executables |
Detailed Comparison¶
pyobfus vs PyArmor¶
PyArmor is the most established Python obfuscator. Here's how pyobfus compares:
| Feature | pyobfus | PyArmor |
|---|---|---|
| Price (Pro) | $45 (one-time) | $89 (one-time) |
| Price savings | 50% cheaper | - |
| Free tier | Unlimited (Community features) | ~935-940 lines/file before ERROR out of license (PyArmor 9.2.4, verified 2026-05-09) |
| Pro trial | 5 days free (full features) | Same opaque trial limits as free; no documented threshold |
| Open source | Yes (Core: Apache 2.0, Pro: Proprietary) | No |
| Auditable code | Yes | No |
| Native dependencies | None | Requires pytransform runtime |
| Output format | Pure .py files |
.py + native libraries |
| Cross-platform output | Yes (single output works everywhere) | Requires per-platform build |
| Python 3.8-3.14 | Yes | Yes |
| String encryption | AES-256 (Pro) | AES (Pro) |
| Anti-debugging | Yes (Pro) | Yes (Pro) |
| Control flow flattening | Yes (Pro v0.3.0+) | Yes (Pro) |
| License binding | Per-device (3 devices) | Per-device |
| Future Python support | Community-driven | "Can't guarantee" (per docs) |
PyArmor Pain Points (from user feedback)¶
Based on GitHub issues and community feedback, common PyArmor frustrations include:
- Opaque trial limit (~935-940 lines/file): Errors out at this threshold with the message
ERROR out of license— no threshold number, no upgrade hint, no documentation. Verified empirically on PyArmor 9.2.4 in clean venv on 2026-05-09 (935 lines passes, 940 fails; line count not byte count — 900 lines at 67 KB still passes). Full reproducible methodology:PYARMOR_TRIAL_LIMIT_EXPERIMENT.md. - PyInstaller conflicts: DLL version mismatches, slow startup times
- Environment issues: Doesn't work in MSYS, no warning given
- Future compatibility: License may not work with future PyArmor versions
- Complex deployment: Requires distributing native
pytransformlibraries
When to Choose pyobfus¶
- You want transparent, predictable pricing and limits
- You need pure Python output without native dependencies
- You value open-source and code auditability
- You're building cross-platform applications
- You want 50% cost savings over PyArmor Pro
When to Choose PyArmor¶
- You require Themida protection (Windows only)
- You're already invested in PyArmor's ecosystem
- You need bytecode-level encryption
pyobfus vs Oxyry¶
Oxyry is an online Python obfuscation service.
| Feature | pyobfus | Oxyry |
|---|---|---|
| Deployment | CLI tool (local) | Web service only |
| Privacy | Code never leaves your machine | Code uploaded to server |
| Python versions | 3.8 - 3.14 | 3.3 - 3.7 (outdated) |
| Multi-file support | Yes (cross-file) | Limited |
| Configuration | YAML files | Web interface |
| CI/CD integration | Yes | No |
| Offline usage | Yes | No |
When to Choose pyobfus¶
- You need modern Python (3.8+) support
- You want code to stay local (privacy/compliance)
- You need CI/CD integration
- You're obfuscating multi-file projects
When to Choose Oxyry¶
- Quick, one-off obfuscation of small scripts
- You're comfortable with Python 3.7 or older
pyobfus vs Cython¶
Cython compiles Python to C code, providing both performance benefits and obfuscation.
| Feature | pyobfus | Cython |
|---|---|---|
| Approach | AST transformation | Compile to C |
| Output | .py files |
.so/.pyd (platform-specific) |
| Cross-platform | Yes (single output) | No (compile per platform) |
| Build complexity | None | Requires C compiler |
| Development workflow | Unchanged | Compilation step required |
| Performance | Python speed | Near-C speed |
| Reversibility | Names irreversible | Binary harder to reverse |
When to Choose pyobfus¶
- You need cross-platform distribution
- You want to avoid compilation complexity
- You need fast iteration during development
- Your users don't have C compilers
When to Choose Cython¶
- Performance is critical (CPU-bound code)
- You can handle per-platform builds
- You want binary-level protection
pyobfus vs Nuitka¶
Nuitka compiles Python to standalone executables.
| Feature | pyobfus | Nuitka |
|---|---|---|
| Output | .py files |
Standalone binary |
| Distribution | Requires Python installed | Self-contained |
| Build time | Instant | Minutes to hours |
| File size | Original size | Large (includes Python) |
| Commercial price | $45 | ~$270/year |
| License model | One-time | Annual subscription |
When to Choose pyobfus¶
- You're distributing Python libraries (not executables)
- You want one-time payment vs subscription
- You need fast builds (no compilation)
- File size matters
When to Choose Nuitka¶
- You need standalone executables
- Users shouldn't need Python installed
- You want maximum binary protection
Feature Matrix¶
Obfuscation Techniques¶
| Technique | pyobfus Free | pyobfus Pro | PyArmor | Cython |
|---|---|---|---|---|
| Name mangling | Yes | Yes | Yes | Yes (binary) |
| String encoding (Base64) | Yes | Yes | No | No |
| String encryption (AES) | No | Yes | Yes | No |
| Docstring removal | Yes | Yes | Yes | No |
| Comment removal | Yes | Yes | Yes | Yes |
| Anti-debugging | No | Yes | Yes | No |
| Control flow flattening | No | Yes | Yes | No |
| Dead code injection | No | Yes | No | No |
| License embedding | No | Yes | Yes | No |
| Configuration presets | No | Yes | No | No |
Developer Experience¶
| Feature | pyobfus | PyArmor | Oxyry | Cython |
|---|---|---|---|---|
| CLI tool | Yes | Yes | No | Yes |
| YAML configuration | Yes | Yes | No | setup.py |
| Dry-run preview | Yes | No | No | No |
| Cross-file support | Yes | Yes | Limited | Yes |
| CI/CD friendly | Yes | Yes | No | Yes |
| Error messages | Clear | Often vague | N/A | Technical |
Pricing Comparison¶
One-Time Purchase¶
| Tool | Free Tier | Pro/Commercial |
|---|---|---|
| pyobfus | Unlimited (5-day Pro trial) | $45 |
| PyArmor Basic | Trial (vague limits) | $52 |
| PyArmor Pro | Trial (vague limits) | $89 |
| PyArmor Group | Trial (vague limits) | $158 |
Annual Subscription¶
| Tool | Price/Year |
|---|---|
| pyobfus | $0 (one-time Pro) |
| PyArmor CI | $90/year |
| Nuitka Commercial | ~$270/year |
Total Cost of Ownership (3 Years)¶
| Tool | Year 1 | Year 2 | Year 3 | Total |
|---|---|---|---|---|
| pyobfus Pro | $45 | $0 | $0 | $45 |
| PyArmor Pro | $89 | $0 | $0 | $89 |
| Nuitka | $270 | $270 | $270 | $810 |
Migration Guide¶
From PyArmor to pyobfus¶
-
Install pyobfus:
bash pip install pyobfus -
Create configuration (if you had PyArmor config):
bash pyobfus --init-config general # Edit pyobfus.yaml to match your needs -
Run obfuscation:
bash # PyArmor: pyarmor gen src/ # pyobfus equivalent: pyobfus src/ -o dist/ -
Key differences:
- No native
pytransformlibrary needed - Output is pure Python
- Cross-file imports automatically handled
From Oxyry to pyobfus¶
-
Install locally:
bash pip install pyobfus -
Run from command line:
bash pyobfus your_script.py -o obfuscated.py -
Benefits:
- Code stays on your machine
- Modern Python 3.8-3.14 support
- Batch processing for directories
Layered Deployment Strategy¶
Most production Python projects don't need a single obfuscation tool — they need the right tool for each layer of the codebase.
A layered approach that fits the 2026 ecosystem:
| Stage | Recommended | Why |
|---|---|---|
| Development / testing | No obfuscation | Faster iteration; full debug visibility |
| Pre-release / staging | pyobfus (Community or Pro) | AST mangling + mapping preserved → AI assistants can still debug; cross-platform .py output; no native deps |
| Production / customer delivery | pyobfus + optional PyArmor Pro or Nuitka Commercial on highest-value modules | pyobfus protects the entire codebase consistently; PyArmor adds bytecode-level protection on the few modules that genuinely need it; Nuitka adds compile-to-native for performance-critical sections |
Why pyobfus is the always-on default layer: it's the only tool in this space that doesn't break AI-assisted debugging in production. PyArmor's bytecode encryption and Nuitka's compilation are both one-way — once a stack trace comes back from production, neither tool can map it back to readable identifiers without losing the protection. pyobfus's --save-mapping + --unmap workflow is purpose-built for this: the obfuscated artifact ships to customers, the mapping stays in your secure storage, and you can hand a reversed trace to Claude Code or Cursor without giving up the obfuscation.
Why pyobfus alone may not be enough for the crown jewels: pyobfus's protection is AST-level, which means a determined attacker with time can reverse most of the structure. If a single algorithm module is the company's crown jewel, stacking PyArmor Pro's bytecode encryption or Nuitka's native compilation on top of that one module is rational. We don't pretend otherwise.
This honest framing is part of why pyobfus is priced at $45 single-tier instead of competing with PyArmor's enterprise track — pyobfus is the tool you reach for first, not necessarily the only tool in the toolbox.
Conclusion¶
Choose pyobfus if you want: - Transparent, affordable pricing (50% cheaper than PyArmor) - Open-source trust and auditability - Pure Python output without native dependencies - Cross-platform compatibility from a single build - Modern Python 3.8-3.14 support
Get started:
pip install pyobfus
pyobfus --help
Questions? Open an issue on GitHub or join our Discussions.