Head-to-head · updated 13 September 2026

DataShield vs Presidio: what do you still have to build around a PII detection library?

Presidio is good. It finds PII in free text, in images, and in tables. It speaks about 18 country formats, and it costs nothing. It's MIT licensed. It has 10,832 stars. It shipped a release two months ago. If you need to know whether a string holds a Swedish personal number, install it today.

But Presidio is a tool, not a system. Its own docs say it keeps no state. You must manage your own salt. So the vault, the access rules, the log, and the erase story are all still your job. DataShield ships those. We tokenize datasets at ingest. Agents query the tokenized data over MCP. Reversing a token is a special, audited step. Most teams here keep Presidio and stop hand-building the rest.

Get free Demo Center access Get an instant quote

The short version

Pick DataShield when

You need to prove an access log wasn't edited. Ours is a hash chain with signed checkpoints. Presidio writes no log at all. Run the verifier.
Agents are in the picture, and their access can change. We recheck it on every checked tool call. So a revoked agent fails on the next one. How Auth does it.
Someone has to hold the original values. We ship a vault, key custody, and a logged path back. Presidio's encrypt operator hands you ciphertext. Good luck with the rest.
A GDPR erase request has to land without breaking the audit trail. Crypto-shred does that.

Pick Presidio when

You want detection in free text, right now, for nothing. Nobody beats free. The recognizer set runs deep.
The data is images, PDFs, or DICOM. Their image redactor handles those. We don't redact pixels.
You want to own the code. MIT licence, self-hosted. No contract, no seat count, no renewal call.
Your need is one country format, or one odd entity type. Write a recognizer in an afternoon and move on.

Bottom line: Presidio tells you where the PII is and can scrub it. It does not say who was allowed to see it, keep the original safely, or prove any of it later. Those are different jobs. Run both.

Feature by feature

Competitor cells describe what Presidio's public docs and release notes say, as of the date above. If we got something wrong, email support@myorg.ai. We'll fix it, and credit you.

What matters	DataShield	Presidio	Edge
Audit evidence	A SHA-256 hash chain, with Ed25519-signed checkpoints. The checkpoints chain too. A check names the failure: tampering, insertion, deletion, or truncation. Try the verifier.	None. Presidio is a function call. Logging is left to the host app.	◆
Agent authorization	Every checked tool call passes three gates. A scope ceiling. An access tier. A check for revoke. A revoke lands mid-session.	No concept of an actor. Anyone who can call the tool, can.	◆
Break-glass	Scoped, time-boxed emergency access for agents. It auto-revokes. No one can quietly delete it from the log.	Not a fit for a tool.	◆
GDPR erasure	We crypto-shred each subject's keys. We add an ISO 27560 consent receipt. The chain still checks out after erase.	No subject-level keys. No store. So there's no erase mechanism to speak of.	◆
Tokenization and data handling	Set, join-safe tokens, held in a vault we can reverse, made at ingest. Plus quasi-identifier generalization. Dates cut to year, decade, or age band. ZIP codes cut to 3 or 4 digits. Phones, SSNs, and emails cut too. Each column gets a measured score for the cut. Reversing a token is a special, logged step.	Operators for replace, redact, mask, salted hash, encrypt, and keep. Decrypt reverses encryption, if you hold the key. Docs state Presidio keeps no state. You must supply your own salt to keep records linked.	◆
Detection breadth	PII and PHI checks against 129 field classes. That's all 18 HIPAA Safe Harbor IDs, plus eight non-US national ID formats. It uses checksum checks, column-name lists, and anti-pattern filters. It's set, so a verdict repeats from a config digest. Fewer languages than they cover. No NER model.	About 14 global entities, roughly 18 country packs, 8 medical types. Backends include spaCy, transformers, GLiNER, LangExtract, and Azure AI Language.	◇
Images and documents	No image redaction. We do pull and scan text from PDF, DOCX and EML files.	Image redactor with OCR, plus DICOM support for medical images.	◇
MCP and agents	Native MCP endpoints on Auth, Ontology, and Lighthouse. MCP tool tokens with scope ceilings. Per-call metering, pinned to the agent.	Nothing native. LiteLLM embeds Presidio as a guardrail. It offers a `pre_mcp_call` mode. That lets it mask strings before an MCP call. It still can't say if the call was allowed.	◆
Deployment	Self-hosted, in your own cloud or data center. Or on a dedicated single-tenant server we run. Your keys.	Self-hosted by design. A Python package, or two Docker containers: analyzer and anonymizer.	◈
Maturity signals	Auth, Guardian and Lighthouse are live in production. Guardian and Lighthouse have run since April 2026. SOC 2 is not yet certified. We say so.	Started at Microsoft in 2018. Now run by the community, under the Data Privacy Stack org. 10,832 stars, 1,285 forks, last push 10 September 2026. No certs apply to a tool.	◇
Support and ownership	A commercial vendor, small team. Design-partner terms include source escrow.	Volunteer maintainers. Microsoft handed off the project. It says it backs the move. No one owes you a patch.	◈
Pricing	Published model, scoped instant quote, no sales wall.	Free. MIT. This row isn't close.	◇

◆ DataShield leads◇ Presidio leads◈ comparable

Presidio claims come from the project docs at presidio.dataprivacystack.org and the GitHub release notes. We last checked 13 September 2026. We link them below, rather than work from memory.

Three things you get here that you won't get from a detection library

Proof that survives an audit

A log you can edit proves nothing. Ours is a hash chain with signed checkpoints. The verifier says what broke. Not just that something did. That's the trait EU AI Act Article 12 and HIPAA §164.312(b) reviewers look for. Presidio writes no log. So the log is whatever your app wrote. Try ours in your browser, no signup.

A key you don't have to babysit

Presidio's docs are honest: no state, bring your own salt, hold your own key. That's fine in a notebook. In production, it means one engineer owns a secret that can undo every mask you ever applied. We put that behind a vault, with custody, rotation, and a logged path back. See the architecture.

Authority that can change mid-flight

An analyst leaves on a Friday. Their agent is still 20 minutes into a job. We recheck access on the next checked tool call. We fail closed. A masking step in the pipeline has no opinion on this. It doesn't know who's asking. How Auth does it.

Where Presidio is genuinely stronger

Let's be fair about this. Presidio has run since 2018. It's MIT licensed. It does one hard thing well: spotting personal data in messy text. The recognizer catalogue keeps growing. German, Swedish, Canadian, and UK additions landed in the last two releases alone. It runs spaCy, transformers, GLiNER, or an LLM through LangExtract. So you can trade speed against accuracy. It redacts images and DICOM files, which we don't do at all. And in 2026 the project moved out of Microsoft, into community governance. Several buyers told us they read that as a plus, not a risk. If your problem is "find the PII in this blob," the answer is Presidio. You can stop reading.

The push-back is about what happens next. Detection is a step in a pipeline. A control is something an examiner can inspect. Their own anonymizer page says Presidio keeps no state. You must supply your own salt to keep records linked. That single line is the gap: no vault, no custody, no actor, no log. Teams fill it with a Postgres table, a KMS key, and a Slack thread about who has access. It works until March, when someone asks for the March logs. Then you find out the table has no integrity check. That's the part we sell. We'd rather you keep Presidio for the detection.

Questions worth asking both of us

These are the questions we'd want answered if we were the buyer. Ask them on every vendor call, ours included.

Can you cryptographically prove an audit log entry wasn't deleted?

DataShield: yes. Each record commits to the one before it. Checkpoints are signed and chained. A check tells deletion apart from truncation and tampering. Try it at /verify. Presidio: no, and it doesn't claim to. It's a tool with no store and no log. Whatever your app wrote is the whole proof story. Ask your own team the same question.

What happens to a revoked agent mid-session?

DataShield rechecks access on every checked tool call. So a revoke bites on the next call. Presidio has no notion of an agent. Even in the LiteLLM setup, a Presidio guardrail runs before an MCP call. It masks strings and passes the call along. It can't block a call the agent should no longer make.

How does GDPR erasure interact with the audit trail?

DataShield crypto-shreds each subject's keys. It issues an ISO 27560 consent receipt. Actor names in the chain are HMAC-committed. So the proof still checks out after the subject is gone. Presidio holds no subject data. So erasure is a question for whatever you built around it. If that's an encrypted column and one shared key, erasing one person is hard.

Is DataShield a replacement for Presidio?

No, and we'd rather say so. Presidio is a PII detection and anonymizing tool. We classify and tokenize datasets at ingest. Then we control what agents do with them. Several teams run Presidio over free text and chat logs. They run us over the datasets agents query. The question isn't which one wins. It's which layer the duty lands in.

We already use Presidio's encrypt operator. Isn't that reversible tokenization?

It's reversible, which is the important half. It isn't checked, though. Decrypt is a function that takes a key. Anyone holding the key can re-identify anyone, with no record. Our tokens are set and join-safe, so analytics still work. Reversing a token is a special, audited step. That's the gap between a cipher and a control.

Does DataShield have SOC 2?

Not yet. We won't say otherwise. Auth is live, with a public threat model. Anyone can run our verifier. Guardian and Lighthouse have run in production since April 2026. Design-partner terms include source escrow. So a small vendor isn't a single point of failure. Details on the security page.

Presidio is "an open-source framework for detecting, redacting, masking, and anonymizing sensitive data (PII) across text, images, and structured data". MIT licensed, 10,832 stars, 1,285 forks, last push 10 September 2026. - GitHub, data-privacy-stack/presidio, 13 Sep 2026
Presidio moved from Microsoft to "an independent, community-governed open source project under the new GitHub organization Data Privacy Stack". Microsoft "supports this transition". - Presidio docs, project transition update, 13 Sep 2026
"Presidio does not store or maintain stateful sessions. For referential integrity across records or calls, users must securely manage and provide their own salt." Operators: replace, redact, mask, hash, encrypt, custom, keep. - Presidio anonymizer docs, 13 Sep 2026
Release 2.2.364 (22 July 2026) added batch deanonymization and recognizer-level thresholds. Release 2.2.361 added an LLM-based LangExtract recognizer and salted hashing. - GitHub releases, microsoft/presidio, 13 Sep 2026
LiteLLM ships a Presidio PII guardrail. It has pre_call, post_call, logging_only, and pre_mcp_call modes. It runs as two Docker containers. - LiteLLM docs, 13 Sep 2026
EDPB names pseudonymization as a GDPR risk mitigation for AI models. - EDPB Opinion 28/2024

Other head-to-heads

Adjacent

Get free Demo Center access

You've seen the proof

Ready for a number? Scope your deployment and we'll price it against your own economics.

Get your quote →