Authentication
5 EU-headquartered authentication companies on EU Alts — including Idura, Curity, and Hanko. Every listed provider is founded or based in Europe; each listing page records its ownership and hosting so you can judge US CLOUD Act exposure.
Also worth a look: FjordID, an early-stage managed OIDC/OAuth2 identity platform hosted in Germany. Disclosure: FjordID is built by the maker of this directory.
Danish eID authentication and e-signature platform (formerly Criipto) — integrates MitID, Norwegian and Swedish BankID and the Finnish Trust Network.
Swedish identity and API access platform. OAuth and OpenID Connect infrastructure for organisations where security and control are non-negotiable.
Open-source passkey and passwordless authentication from Kiel, Germany. Made and hosted in Europe, with self-hosting available.
German cloud identity and access management (CIAM) platform — made and hosted in Germany, with dedicated German server locations for regulated sectors.
FjordID✓ Verified by EU AltsManaged OIDC/OAuth2 identity platform hosted on Hetzner in Germany. Drop-in Auth0 replacement with EU data residency and zero US subprocessors.
Frequently asked questions
What are the best EU-built Authentication tools?
EU Alts lists 5 EU-headquartered Authentication companies — including Idura, Curity, and Hanko. All are founded or based in Europe (from Germany, Denmark, and Norway), giving you European alternatives to US Authentication software; each listing records its own ownership and hosting.
Which Authentication startups should I shortlist first?
Three picks worth shortlisting first: Idura (Denmark) — Danish eID authentication and e-signature platform (formerly Criipto) — integrates MitID, Norwegian and Swedish BankID and the Finnish Trust Network.; Curity (Sweden) — Swedish identity and API access platform. OAuth and OpenID Connect infrastructure for organisations where security and control are non-negotiable.; Hanko (Germany) — Open-source passkey and passwordless authentication from Kiel, Germany. Made and hosted in Europe, with self-hosting available..
Are Authentication tools from EU companies GDPR-compliant?
EU-headquartered Authentication providers are subject to the GDPR by default. The Authentication startups on this page are based from Germany, Denmark, and Norway; whether a given company is outside the US CLOUD Act depends on its ownership and hosting, which EU Alts checks per listing.
How do I switch to a GDPR-compliant Authentication alternative?
Start by identifying which EU-based Authentication tools match your feature requirements from the list above. Most EU providers offer free trials and data migration guides to help you move from US-based incumbents. For a Authentication switch specifically, check what data export formats your current tool supports and whether the EU alternative offers an importer.