I just submitted fixes for both apps.

BlastSim

Estimate Casualties doesn’t work for quite a while because the source population API server was shut down. If you try googling none of the sites works anymore as well.
So we implemented another way of estimating population data around the area. This time is self-hosted so It won’t ever fail again. It’s not yet perfect or completed. But it should work similarly to the previous version.
So feel free to contact us to add more geographical data so we can add it to our database.

Elevation

We switched the data source of elevation data for free users. It should be much more reliable than the previous one.
Paid users always have access to much more accurate data sources—up to 0.1-meter accuracy.

That’s it for now!