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Fluent Bit vs Grafana Alloy: catalog facts
Fluent Bit	Grafana Alloy
Free Free and open source.	Free Free and open source from Grafana Labs.
Linux, Self-hosted	Self-hosted
Small footprint for an agent Native OpenTelemetry input and output	One collector for logs and other telemetry Replacement for the retired Promtail
Only a pipeline; needs a separate backend to store and view data Configuration takes some learning	Only a collector; needs Loki, Grafana or another backend to be useful Configuration takes time to learn
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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