Compare software

LuckGrib vs qtVlm: catalog facts
LuckGrib	qtVlm
	Screenshots
Best for: Sailors planning passages with GRIB weather forecasts	Best for: Cruising and racing sailors who plan routes around weather
Paid Purchased through the Apple App Store.	Free + paid options The GRIB viewer is free; mobile and tablet apps, chart packs and the GRIB service are paid.
macOS, iOS	Windows, Android, iOS
Direct downloads of GFS, CMC and WW3 models Weather routing for sailing passages Designed for use while offshore Fast animated forecast display	Weather routing with departure-time comparison Reads S57, S63, raster and MBTiles charts AIS and NMEA instrument support Iridium GO certified
Apple platforms only Paid app	Mobile versions and chart packs are paid Wide feature set takes time to learn
Downloadable app	Downloadable app
Not open source	Not open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for LuckGrib luckgrib.com apps.apple.com/us/app/luckgrib/id1318450117 Catalog checked October 2, 2026	Official website Full listing and sources Sources for qtVlm meltemus.com apps.apple.com/us/app/qtvlm/id999110023 Catalog checked September 24, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.

Screenshots