Category: Database & Data Management

8 European alternatives to QuestDB — GDPR-compliant & EU-hosted.

Open-source time-series database for high ingestion speeds and SQL queries

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Facts

Headquarters: GB (OTHER)
Category: Database & Data Management
Type: Product
GDPR-compliant: Yes
Open-source: Yes
Data hosting: EU

Top EU-based & GDPR-compliant alternatives to QuestDB

CrateDB
Distributed SQL database optimised for machine data and IoT applications
AT · open-source
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DuckDB
In-process analytical database, the SQLite for OLAP, developed in the Netherlands
NL · open-source
↗
MariaDB
open-source relationele database, community-gedreven fork by MySQL
FI · open-source
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Meilisearch
Open-core search engine: the Community Edition is MIT-licensed and free to use, but the Enterprise Edition (sharding, advanced observability, analytics) has been under BUSL 1.1 since v1.19 (August 2025), requiring a commercial agreement for production use.
FR · commercial
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TigerData
Open-source time-series database as PostgreSQL extension for time-series workloads
SE · open-source
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Aiven
Managed open-source data infrastructure (PostgreSQL, Kafka, OpenSearch) in the cloud
FI · commercial
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Exasol
In-memory analytics database for high-performance data analysis and warehousing
DE · commercial
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SAP HANA
In-memory column-store database by SAP for real-time analytics and transaction processing
DE · commercial
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Frequently asked questions

What is the best European alternative to QuestDB?

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

Are there open-source alternatives to QuestDB?

Yes. Open-source EU alternatives to QuestDB include CrateDB, DuckDB, MariaDB and TigerData. These keep your data fully under your own control and let you self-host if you want to.

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

QuestDB is headquartered in GB (OTHER) and hosts data in EU. 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.

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