What Opaquer is
Opaquer is the successor to Skater .NET Obfuscator, from RustemSoft. It offers name mangling, string encryption, lightweight control-flow obfuscation and anti-tampering, with a free Basic edition.
Its CLI is in the Pro edition, for batch and CI use, and offline builds are in the Enterprise edition.
We cover the same core protections. The difference is delivery: we run in a browser with nothing to install, while Opaquer is a desktop and CLI tool.
Opaquer pricing
Opaquer: Free Basic edition; Pro $189.99; Enterprise $489.99. Checked Oct 2026 from listing sites — confirm with RustemSoft.
FreeObfuscator: free to use with no account. An optional Pro plan adds larger files, batch obfuscation, string encryption, control-flow obfuscation and an HTTP API for CI/CD.
Capabilities side by side
| Capability | Opaquer | FreeObfuscator |
|---|---|---|
| Symbol renaming | Yes | Yes |
| String encryption Ours: Pro | Yes | Paid tier |
| Control-flow obfuscation Ours: Pro | Yes | Paid tier |
| Anti-tampering Ours: an integrity check on virtualized methods, Pro | Yes | Partial |
| Free tier Opaquer Basic; ours is free for renaming | Yes | Yes |
| Runs locally We process server-side | Yes | No |
| Zero configuration | No | Yes |
| CLI / CI automation Both on the paid tier | Paid tier | Paid tier |
| Works from any OS Ours: any browser | Partial | Yes |
Where Opaquer is strong
- Free Basic edition, so you can start without paying.
- Command-line automation for batch and CI use.
- Offline builds and team licensing on Enterprise.
- Lightweight control-flow obfuscation and anti-tampering are listed as features.
Where it costs you
- Its feature set and editions are split across several tiers, and the strongest options sit in the top tier.
- Most published information is from the vendor and listing sites, with no independent review found.
- Pricing and edition details can change, so check the official site before buying.
Choosing between them
Choose Opaquer if
- You want a free starting point and paid CLI automation.
- Your code cannot leave your network.
- You need offline builds, which are in the Enterprise edition.
Choose FreeObfuscator if
- You do not want to install a tool or pick an edition.
- You want to see the result on your assembly before paying.
- You would rather call an HTTP API than run a CLI.
The verdict
Opaquer is a credible commercial option with a useful free tier, and if you need offline builds or a local CLI, it fits. If you want the strongest protection with the least setup and nothing to install, we are the simpler choice; try both on your assembly before you decide.
Worth knowing before you decide: what obfuscation actually protects against sets realistic expectations about how far any of these tools go.