Non-EU vendorAI SecurityHeadquarters: US

Prompt Security: sovereignty score and 8 European alternatives

Prompt Security is a platform for securing generative AI, now offered by SentinelOne. It gives IT and security teams visibility and control over the use of AI tools such as ChatGPT, Gemini and Claude, including unsanctioned tools used by employees. According to the vendor, it can redact or block sensitive data, counter prompt injection and jailbreaks, and use an MCP gateway to control traffic between AI applications and MCP servers. It works through lightweight agents and browser extensions. The service is delivered as SaaS; the AWS Marketplace listing also mentions three self-hosted options.

SentinelOne completed its acquisition of Prompt Security in September 2025. SentinelOne is a US company based in Mountain View, California, so the service falls under US jurisdiction, including the CLOUD Act. The vendor does not publish in which regions customer data is stored, while prompts and responses are, according to the vendor, captured in searchable logs. A European organisation should therefore ask about the storage location up front and consider the self-hosted options. The platform is proprietary.

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Sovereignty score

17 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-210
Headquartered in the US: CLOUD Act and FISA 702
Data residency SOV-30
No hosting in Europe (US)
Cryptographic key sovereignty SOV-320
Key management with a non-European vendor
Freedom from lock-in SOV-640
Closed source: switching requires data migration
Source & runtime sovereignty SOV-4 · SOV-615
Closed source, runtime with the vendor

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 11, 2026

Headquarters	US (US)Verified by hand
EU adequacy decision	Only for companies individually certified under the EU-US Data Privacy FrameworkVerified by hand
Sovereignty model	Vendor-hosted (non-EU)Verified by hand
Data hosting	USVerified by hand
Open-source	NoVerified by hand
GDPR-compliant	NoVendor-stated
Category	AI Security
Type	Product
Website	prompt.security ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Prompt Security

The European alternatives to Prompt Security come from our knowledge base of over 6,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

12 European AI Security vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with Prompt Security

Prompt Security is headquartered in the United States. US vendors fall under the CLOUD Act and FISA 702: US authorities can compel access to data, even when that data sits in a European data centre. That is the core of the jurisdictional exposure in our model.

Prompt Security hosts data outside the EU (US). Personal data therefore leaves the EU, which requires a transfer mechanism under the GDPR and pulls the data residency score down.

Prompt Security is closed source and hosted by the vendor. The encryption keys and the runtime sit with the vendor and switching requires data migration. Ask about bring-your-own-key, export options and open standards.

What this means for your organisation depends on your whole stack and context. The free assessment weighs Prompt Security together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to Prompt Security?

It depends on your use case. Strong EU alternatives to Prompt Security include 2021.AI GRACE, CalypsoAI and Giskard. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Prompt Security?

Yes. Open-source EU alternatives to Prompt Security include Giskard and Mistral Shieldstral. These keep your data fully under your own control and let you self-host if you want to.

Is Prompt Security GDPR-compliant and where is the data hosted?

Prompt Security is headquartered in US and hosts data in US. Its GDPR compliance is limited or unclear. For full EU data residency the EU alternatives on this page usually offer more certainty.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 11, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in AI Security

AI Security: Security for AI/LLM systems — prompt-injection detection, AI red-teaming, agentic security posture management and AI governance guardrails. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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