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Fluentd vs Fluent Bit: catalog facts
Fluentd	Fluent Bit
Free Free and open source; commercial support is sold separately by other companies.	Free Free and open source.
Self-hosted	Linux, Self-hosted
More than 500 plugins for inputs and outputs Decouples log sources from storage backends	Small footprint for an agent Native OpenTelemetry input and output
Aimed at server infrastructure rather than a single desktop Needs configuration and plugins chosen for each setup	Only a pipeline; needs a separate backend to store and view data Configuration takes some learning
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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