Self-hosted / open sourceData Platform & WarehouseHeadquarters: US

Hydra: sovereignty score and 8 European alternatives

Hydra Columnar is an open-source storage extension for PostgreSQL that stores tables in a column-oriented layout. It is designed for analytical workloads such as aggregates, filters and bulk inserts, and provides columnar storage, query parallelisation, vectorised execution and column-level caching. According to the project page it is less suited to frequent large updates or small transactions. You run it yourself as a Docker image that serves as a drop-in replacement for the official Postgres image, in your own environment.

Hydra was founded in San Francisco (Y Combinator, Winter 2022). In February 2026 Supabase announced that the Hydra team is joining Supabase and that Supabase will take over maintenance of Hydra's existing repositories; according to Supabase, everything stays open source. Because you host Hydra yourself, you decide where the data resides, for example within the EU, and no hosted service is needed. The repository's licence is not stated consistently in its documentation (AGPL 3.0 and Apache 2.0), so check it before use.

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

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Sovereignty score

71 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-210
Headquartered in the US: CLOUD Act and FISA 702
Data residency SOV-3100
Hosting inside and outside Europe (EU, OTHER)
Cryptographic key sovereignty SOV-390
Self-hostable: encryption keys under your own control
Freedom from lock-in SOV-680
Open source: low switching costs
Source & runtime sovereignty SOV-4 · SOV-675
Source code auditable, forkable and self-hostable

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 5, 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	Open-source, distributedVerified by hand
Data hosting	EU, OTHERVerified by hand
Open-source	YesVerified by hand
GDPR-compliant	YesVendor-stated
Category	Data Platform & Warehouse
Type	Product
Website	github.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Hydra

The European alternatives to Hydra 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 Data Platform & Warehouse 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 Hydra

Hydra 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.

Hydra hosts data in EU, 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.

Hydra is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs Hydra 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 Hydra?

It depends on your use case. Strong EU alternatives to Hydra include DuckDB, Exasol and Falkor. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Hydra?

Yes. Open-source EU alternatives to Hydra include DuckDB, Garage and MonetDB. These keep your data fully under your own control and let you self-host if you want to.

Is Hydra GDPR-compliant and where is the data hosted?

Hydra is headquartered in US and hosts data in EU, 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 5, 2026.

Sources

Public sources used in the latest check of this record.

github.com/hydradatabase/hydra

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 Data Platform & Warehouse

Data Platform & Warehouse: Lakehouses, cloud data warehouses, data-lake storage and analytical databases for enterprise-wide analysis. 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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