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QuestDB vs ClickHouse: catalog facts
QuestDB	ClickHouse
Freemium A free edition or tier is available. Additional features or hosted services require…	Freemium Free and open source to self-host, with a paid managed cloud service also available.
Self-hosted	Self-hosted
Supports time-oriented SQL queries Offers an open-source self-hosted edition	Columnar storage gives fast query performance over very large datasets Widely adopted as the backend for other open source observability tools
Managed service and enterprise capabilities have separate terms.	Using it well for observability requires additional tooling or schema design on top Operating a ClickHouse cluster at scale takes real database administration expertise
Self-hosted	Self-hosted, Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.