[0]https://www.ventusky.com/
[1]https://mrms.nssl.noaa.gov/qvs/product_viewer/
[1] https://www.spc.noaa.gov/
[2] https://www.wpc.ncep.noaa.gov/metwatch/metwatch_mpd.php
This is really handy as national models can be much better for short-term and higher resolution predictions.
It has the widest range of models freely available that I'm aware of, including the commercial ECMWF model.
Globally, we have GFS (FV3) and GDPS in the free version, and DWD ICON in pro.
For north America, we have NAM 12km, NAM 3km, HRRR, RDPS, HRDPS in Pro
For Europe, we have DWD ICON EU, DWD COSMO-D2, ARPEGE, AROME and HIRLAM in Pro.
If you double-tapping of a graph, you can compare the forecasts quite easily.
Sorry there is no iOS or web version, nor ECMWF (it's too costly).
[0] https://flowx.io
The forums really light up for big storms with lots of discussion and insight.
[0]https://www.ventusky.com/
[1]https://mrms.nssl.noaa.gov/qvs/product_viewer/