Is the 10MB limit for a 3g App Store download for the zip or the binary?

Question

I'm about to release my first app and I'd like for it to be able to be downloaded over 3g.

The binary is ~14MB, but when I compress it to a zip file it is just over 10MB. It's possible to cut out some content in order to squeeze it into 10MB, but I'm not sure if I have to cut out less than 1MB or ~4MB.

My question: When downloading an app from the App Store, does a compressed (zip) file get transferred to the device, or does the binary? Is the 10MB limit on the zip or the binary?

Answer 1

In practice, I have seen my apps at 9.8 mb require wifi. To be safe, I usually keep my zip file under 9mb

UPDATE: 2/27/10 Apple has recently updated this limit from 10MB to 20MB

Answer 2

It is the IPA file that is transferred to the user.