Compare software

fblog vs lnav: catalog facts
fblog	lnav
Free Free software under the WTFPL license.	Free Free and open source.
Command line	macOS, Linux, Command line
Prints selected fields from JSON logs Can filter messages with Lua	Automatic detection of log formats and compressed files Merges several logs into one view
Designed for JSON logs. Does not support native log tailing.	Meant for small-scale use, not central log collection Terminal interface takes some learning
Downloadable app	Downloadable app
Closed source	Open source
License: WTFPL	License: BSD-2-Clause
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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