Compare software

fblog vs Open Log Viewer: catalog facts
fblog	Open Log Viewer
Free Free software under the WTFPL license.	Free Free and open source under GPL-3.0-or-later.
Command line	Windows, macOS, Linux
Prints selected fields from JSON logs Can filter messages with Lua	Opens multiple log files in tabs Follows changes to log files
Designed for JSON logs. Does not support native log tailing.	Desktop app built with Electron
Downloadable app	Downloadable app
Closed source	Open source
License: WTFPL	License: GPL-3.0-or-later
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 October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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