anonym.legal vs Philter
Philter (Philterd) is an open-source PII/PHI redaction tool with 30+ entity types and self-hosting capabilities. anonym.legal is a managed PII anonymization platform with reversible encryption, 285+ entity types, and user-level tools for transforming data before sharing with AI.
Feature Comparison
| Feature | anonym.legal | Philter |
|---|---|---|
| PII Detection | Yes | Check |
| PII Redaction | Yes | Check |
| Reversible Encryption | AES-256-GCM | Not found |
| Entity Types | 285+ | 30+ |
| Languages Supported | Yes | Not documented |
| Self-Hosted Option | No | Check |
| Managed Service | Yes | DIY |
| REST API | Yes | Not documented |
| MCP Server | Yes | Not found |
| Chrome Extension | Yes | Not found |
| Office Add-in | Yes | Not found |
| Desktop App | Yes | Not found |
| Open Source | Yes | Check |
| Starting Price | Free / €3/mo | Free (self-hosted) |
| Zero-Knowledge Auth | Yes | Not found |
Comparison based on publicly available information. "Not found" indicates feature not documented on product page. Last updated February 2026.
Why Choose anonym.legal
97% Lower Cost
Start at €3/month instead of $800/month. Free tier available with no credit card required.
Reversible Encryption
Unique AES-256-GCM encryption that can be decrypted when needed. Essential for legal discovery.
AI Chat Protection
Chrome Extension protects data before it reaches ChatGPT, Claude, or Gemini.
MCP Server
Integrate with Claude Desktop, Cursor, and other AI tools via Model Context Protocol.
48 Languages
Full support for 48 languages including RTL. Compare entity detection across regions.
EU Data Residency
All data processed on ISO 27001-certified servers in Germany. No US jurisdiction concerns.
When Philter Might Be Better
Philter excels in self-hosted scenarios:
- Full control over infrastructure
- Open-source code inspection
- Air-gapped or isolated environments
- Custom modifications to detection logic
- Zero external dependencies
Frequently Asked Questions
What is the main difference between Philter and anonym.legal?
Philter is an open-source, self-hosted PII redaction library with 30+ entity types. anonym.legal is a managed service with 285+ entity types, reversible encryption, and end-user tools like Chrome Extension and Office Add-in.
Is Philter truly free?
Philter is open source but requires infrastructure costs and DevOps expertise to deploy and maintain. anonym.legal has a free tier with managed infrastructure.
Does Philter support reversible encryption?
Reversible encryption is not documented in Philter's public documentation. anonym.legal offers AES-256-GCM reversible encryption to restore original values.
Which has better entity coverage?
anonym.legal detects 285+ entity types across 48 languages. Philter documents 30+ entity types (PII/PHI/NPPI) with undocumented language support.
Can end users work with Philter directly?
Philter is a developer library without end-user interfaces. anonym.legal provides Chrome Extension, Office Add-in, and Desktop App for non-technical users.
Does anonym.legal offer zero-knowledge authentication?
Yes. anonym.legal uses zero-knowledge authentication with Argon2id and HKDF. Your password is processed on your device — only a mathematical proof is sent to the server, never the actual password.
Try anonym.legal Free
Start protecting sensitive data today with 285+ entity types, 48 languages, and reversible encryption.