piisafe.eu vs Microsoft Presidio
Both are excellent PII detection tools — but they serve different needs. Here's how to choose.
One thing the choice does not change: the law that applies to the result. Under Article 5(2) of Regulation (EU) 2016/679 — the GDPR, applicable across the EU since 25 May 2018 — the controller has to demonstrate compliance no matter which tool produced the finding. Run detection yourself and Article 32 still asks for appropriate technical and organisational measures; have someone run it for you and Article 28(3) adds a written processor contract on top. Article 44 restricts transfers outside the EU, and in 2020 the Court of Justice invalidated the EU-US Privacy Shield in Case C-311/18, Schrems II, so where the detection actually executes is a compliance question rather than a preference. Article 83(4) puts failures of this kind in the lower fine band, up to €10 million or 2% of worldwide annual turnover; Article 83(5) reserves the upper band, €20 million or 4%, for breaches of the basic principles. Where an AI system is part of the pipeline, the EU AI Act — Regulation (EU) 2024/1689, in force since 2024 — adds its own duties, with penalties reaching €35 million or 7% under Article 99(3).
On the piisafe.eu side the operating numbers are fixed and worth putting beside any self-hosted plan: one scan covers at most 1,000 pages, each call to the detection API takes at most 50,000 characters, 20 new scans per hour are allowed from one IP address, and findings live in server memory only until the sweep removes the session 35 minutes after the scan ends.
Quick Comparison
| Feature | piisafe.eu | Microsoft Presidio |
|---|---|---|
| Entity Types | 58 | ~50 |
| Languages | 48 | ~10 (extensible) |
| Countries | 14 dedicated + universal | Limited (US-focused) |
| Setup Required | None (web-based) | Python, Docker, ML setup |
| Time to First Scan | 30 seconds | 1-4 hours (setup) |
| Scan Data Stored | No (in-memory only, never persisted) | Depends on deployment |
| Detection Method | Deterministic regex + NLP | ML + regex (configurable) |
| Customization | Presets (GDPR, HIPAA, etc.) | Full (add custom recognizers) |
| Open Source | No (API-based) | Yes (MIT license) |
| Self-Hosted Option | No | Yes |
| Free to Use | Tool is free (detection key from €3/month) | Yes (open-source) |
| Enterprise Support | Via anonym.legal | Community + Azure |
| Data Residency | Germany (EU) | Your choice |
| Compliance Reports | HTML, JSON, CSV export | Custom implementation |
The Verdict
Choose piisafe.eu if you need immediate compliance audits, want broad language and country coverage (48 languages), and want no scan-data retention. No setup, no engineering.
Choose Presidio if you need full control over detection logic, want to self-host for data sovereignty, have ML engineering resources, and need custom recognizers for domain-specific patterns.
When to Choose Each Tool
Quick GDPR Compliance Audit
You need to scan a website before a compliance deadline. No time for setup. Export a report for your DPO immediately.
Pre-Launch Privacy Check
Scan your staging environment before production deployment. Catch exposed test data or sample records in minutes.
Vendor Assessment
Evaluate a third-party website for privacy practices before sharing customer data. No registration or API setup needed.
International Coverage
You need detection across 48 languages with dedicated national identifier types for 14 countries (UK, US, Australia, New Zealand, India, Canada, Turkey, Israel, Singapore, Bulgaria, Czechia, Slovakia, Estonia, Latvia). Presidio is US-focused by default.
Custom Detection Patterns
You need to detect domain-specific identifiers (internal employee IDs, proprietary account numbers) that require custom recognizers.
Air-Gapped Environments
You work in defense, healthcare, or finance with strict data residency requirements. Self-hosting Presidio keeps data on-premises.
Batch Processing Pipelines
You need to integrate PII detection into ETL pipelines, data lakes, or ML preprocessing. Presidio's Python SDK is ideal for this.
Full Control Over Models
You want to fine-tune NER models, add custom spaCy components, or integrate with your existing ML infrastructure.
Technical Deep Dive
Detection Approach
piisafe.eu uses hybrid detection (exact pattern recognisers plus an NLP recogniser) optimized for consistency. The same input always produces the same output — essential for compliance audits where reproducibility matters.
Presidio uses a configurable pipeline with pluggable recognizers. By default, it combines regex patterns with spaCy NER models. You can add custom recognizers, swap NER backends, or disable ML entirely for pure regex.
Entity Coverage
piisafe.eu (via the anonym.legal API) supports 58 entity types across 48 languages, with dedicated national identifier types for 14 countries - UK_NINO and UK_NHS, US_SSN and US_ITIN, IN_AADHAAR, AU_TFN, TR_KIMLIK_NO, BG_EGN and more.
Presidio ships with ~50 built-in recognizers focused on US formats (SSN, US passport, US driver license). Non-US formats require custom recognizers or community plugins.
Data Privacy Architecture
piisafe.eu implements a no-storage architecture: scan results exist only in server memory during processing and are polled by your browser. No database writes, no logging of scan content, and finished sessions are deleted automatically within 35 minutes.
Presidio gives you full control over data flow since you self-host. However, you're responsible for implementing privacy measures (encryption, access controls, audit logging) in your deployment.
Frequently Asked Questions
Try piisafe.eu Now — Free, No Setup
Scan any website in 30 seconds. Detect 58 entity types. No registration, no API keys, no setup.