Non-EU vendorConsent Management (CMP)Headquarters: GB

Cassie Consent Management: sovereignty score and 8 European alternatives

Cassie is a consent and preference management platform from Syrenis, aimed at organisations that handle large volumes of customer data. It captures and stores individuals' consents and preferences and helps enforce them across channels and regions, supporting the GDPR and other privacy legislation. Cassie is delivered as software as a service and, according to Syrenis, was developed entirely in-house.

Syrenis Limited is a company incorporated in England and Wales with its registered office in Warrington (Sci-Tech Daresbury). Its own website also names Austin, Texas as head office, following the start of US operations; ownership is not stated. The Syrenis Trust Center lists hosting of Cassie in UK, EU and US regions, and a data processing agreement. For a European organisation it is therefore important to agree in advance which region your environment runs in and which entity is the contracting party.

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Sovereignty score

42 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-250
Headquartered outside the EU (GB)
Data residency SOV-350
Hosting inside and outside Europe (EU, US, OTHER)
Cryptographic key sovereignty SOV-340
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-630
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 13, 2026

Headquarters	GB (OTHER)Verified by hand
EU adequacy decision	Yes — found adequate by the European CommissionVerified by hand
Sovereignty model	Vendor-hosted (non-EU)Verified by hand
Data hosting	EU, US, OTHERVerified by hand
Open-source	NoVerified by hand
GDPR-compliant	YesVendor-stated
Category	Consent Management (CMP)
Type	Product
Website	syrenis.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Cassie Consent Management

The European alternatives to Cassie Consent Management come from our knowledge base of over 8,000 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

27 European Consent Management (CMP) 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 Cassie Consent Management

Cassie Consent Management is headquartered in GB, outside the EU. Contracts and data therefore also fall under non-European law. The GDPR applies through contractual terms, but in a conflict with local legislation you have less certainty than with a European vendor.

Cassie Consent Management hosts data in EU, US, OTHER. 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.

Cassie Consent Management 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 Cassie Consent Management 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 Cassie Consent Management?

It depends on your use case. Strong EU alternatives to Cassie Consent Management include Axeptio, Borlabs Cookie and CCM19. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Cassie Consent Management?

Yes. Open-source EU alternatives to Cassie Consent Management include Consent-O-Matic. These keep your data fully under your own control and let you self-host if you want to.

Is Cassie Consent Management GDPR-compliant and where is the data hosted?

Cassie Consent Management is headquartered in GB (OTHER) and hosts data in EU, US, OTHER. The vendor states it is GDPR-compliant, but the data falls under non-EU jurisdiction. 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 13, 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 Consent Management (CMP)

Consent Management (CMP): Cookie banners and consent management platforms for GDPR compliance. 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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