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