Want to know the kind of damage an impacting asteroid might do to Earth or another planet?

CraterSize calculates the various predicted results of an impact event. Suitable for use by prospective astronomers.

Also suitable for fiction writers and even roleplayers who want to add some science to their fictional plots.

What’s New

Version 1.0.5

Recompile for newer iOS versions (supports minimum iOS 8.1 now).

Removal of Flurry Analytics (to improve your privacy) and old TVOut code.

Ratings and Reviews

2.5 out of 5
4 Ratings

4 Ratings

LI Professor ,

Crater Size XL- almost ready.

No background info or explanation of the underlying formulas? C'mon- for learning's sake!

No keyboard default to numbers?

No exporting of results?

No graphing of results?

Not even suggested "experiments?"

So much potential for learning and teaching, apparently wasted. Please finish the work on this app! Until then, I can't recommend my college students pay for this.

zombe3 ,

Decent start

Pretty good so far. Issues:
1. Doesn't rotate to landscape.
2. Needs English units option.
3. Target density either needs a drop down list or a list of typical values. I don't keep the density of granite in my head.
4. Since all data entry is numeric, keyboard popup should default to numeric.

Looking forward to an updated version.

adkpaddler ,

This app does not work

This app does not work on an iPad running 5.0.1. Do not buy.

App Privacy

The developer, FSpace Publications, indicated that the app’s privacy practices may include handling of data as described below.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


FSpace Publications
12.3 MB

Requires iOS 8.1 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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