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M3DB vs QuestDB: catalog facts
M3DB	QuestDB
Free Open source and free to self-host.	Freemium A free edition or tier is available. Additional features or hosted services require…
Self-hosted	Self-hosted
Built to handle billions of metrics for hyperscale deployments Prometheus-compatible, easing integration with existing metrics tooling	Supports time-oriented SQL queries Offers an open-source self-hosted edition
Complexity and operational overhead are geared toward very large deployments, not small setups Self-hosting a distributed database requires significant infrastructure expertise	Managed service and enterprise capabilities have separate terms.
Self-hosted, Downloadable app	Self-hosted
Open source	Open source
License not stated	License: Apache-2.0
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.