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qtVlm vs Argo: catalog facts
qtVlm	Argo
Screenshots	Screenshots
Best for: Cruising and racing sailors who plan routes around weather	Best for: Recreational boaters who want charts, trip planning and local knowledge from other boaters
Free + paid options The GRIB viewer is free; mobile and tablet apps, chart packs and the GRIB service are paid.	Free + paid options A basic plan is free; paid plans add further features.
Windows, Android, iOS	Android, iOS, Web
Weather routing with departure-time comparison Reads S57, S63, raster and MBTiles charts AIS and NMEA instrument support Iridium GO certified	Free plan includes nautical charts and manual routing Crowdsourced reports and reviews of places and marinas Tide, current, wind and wave forecasts Offline charts and routes
Mobile versions and chart packs are paid Wide feature set takes time to learn	Autorouting and some features sit in paid plans Social features depend on how many boaters use it in your area
Downloadable app	Downloadable app, Web application
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
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for qtVlm meltemus.com apps.apple.com/us/app/qtvlm/id999110023 Catalog checked September 24, 2026	Official website Full listing and sources Sources for Argo argonav.io Catalog checked September 23, 2026

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

Screenshots