Non-EU vendorAI SecurityHeadquarters: US

Harmonic Security: sovereignty score and 8 European alternatives

Harmonic Security offers a platform that helps organisations govern how employees use generative AI. It classifies the purpose of AI use, discovers which tools are in use and controls them in real time through a browser extension, desktop components and an MCP gateway. Its products are named Explore, Guide and Command. The company positions itself as an alternative to pattern-matching data loss prevention, and rollout runs through endpoint management tools such as Intune or Jamf.

The company is based in San Francisco and has a London office; the website does not state the legal entity or the headquarters. The website says EU hosting is available on request, and it also refers to data residency controls and audit logging. Documentation mapping its controls to regulatory requirements is likewise available on request. The trust centre and privacy policy are linked and should be read before use. The software is proprietary. A European organisation should write the EU hosting option into the contract, as a US seat brings US legal access rules.

See the 8 European alternatives ↓Assess your stack with Harmonic Security pre-selected

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Sovereignty score

27 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-210
Headquartered in the US: CLOUD Act and FISA 702
Data residency SOV-350
Hosting inside and outside Europe (EU, 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 Framework	Verified by hand
Sovereignty model	Vendor-hosted (non-EU)	Verified by hand
Data hosting	EU, US	Verified by hand
Open-source	No	Verified by hand
GDPR-compliant	No	Vendor-stated
Category	AI Security
Type	Product
Website	harmonic.security ↗

How we verify · Something wrong? Suggest a correction

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

The European alternatives to Harmonic 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 Harmonic Security

Harmonic 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.

Harmonic Security hosts data in EU, US. Exactly what stays within the EU — and what does not — is defined by the vendor's data processing agreement and sub-processor list, not by a setting you control yourself; check those documents for the precise scope, including backups, logs and support access.

Harmonic 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 Harmonic 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 Harmonic Security?

It depends on your use case. Strong EU alternatives to Harmonic 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 Harmonic Security?

Yes. Open-source EU alternatives to Harmonic 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 Harmonic Security GDPR-compliant and where is the data hosted?

Harmonic Security is headquartered in US and hosts data in EU, 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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