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ULogViewer vs Open Log Viewer: catalog facts
ULogViewer	Open Log Viewer
Free The official page offers free downloads; some data sources and analysis features require…	Free Free and open source under GPL-3.0-or-later.
Windows, macOS, Linux	Windows, macOS, Linux
Reads logs from files, network streams, and databases Filters by text patterns, priority, process ID, and thread ID	Opens multiple log files in tabs Follows changes to log files
Some data sources and analysis features require Pro. The Linux installation guide notes that the interface may appear too small on Hi-DPI screens.	Desktop app built with Electron
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	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 7, 2026	Official website Full listing and sources Checked October 8, 2026

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