Max size of an iOS application
150MB is the constraint for over-the-air downloads via the cellular network. Anything above that and users will be suggested Wi-Fi or iTunes sync to actually get your app.
This will not prevent a purchase though, at point of sale.
With the release of iOS 7 (September 18th, 2013) apple increased the over-the-air cellular download limit to 100MBs.
Maximum app size remains 2GBs.
Source
4GB's is the maximum size your iOS app can be.
As of January 26, 2017
App Size for iOS (& tvOS) only
Your app’s total uncompressed size must be less than 4GB. Each Mach-O executable file (for example,
app_name.app/app_name) must not exceed these limits:
- For apps whose
MinimumOSVersionis less than 7.0: maximum of 80 MB for the total of all__TEXTsections in the binary.- For apps whose
MinimumOSVersionis 7.x through 8.x: maximum of 60 MB per slice for the__TEXTsection of each architecture slice in the binary.- For apps whose
MinimumOSVersionis 9.0 or greater: maximum of 500 MB for the total of all__TEXTsections in the binary.However, consider download times when determining your app’s size. Minimize the file’s size as much as possible, keeping in mind that there is a 100 MB limit for over-the-air downloads.
This information can be found at iTunes Connect Developer Guide: Submitting the App to App Review.
As of February 12, 2015
(iOS only) App Size
iOS App binary files can be as large as 4 GB, but each executable file (app_name.app/app_name) must not exceed 60 MB. Additionally, the total uncompressed size of the app must be less than 4 billion bytes. However, consider download times when determining your app’s size. Minimize the file’s size as much as possible, keeping in mind that there is a 100 MB limit for over-the-air downloads.
This information can be found on page 77 of the iTunes Connect Developer Guide.
As of December 12, 2013
(iOS only) App Size
iOS App binary files can be as large as 2 GB, but the executable file (app_name.app/app_name) cannot exceed 60MB. However, consider download times when determining your app’s size. Minimize the file’s size as much as possible, keeping in mind that there is a 100 MB limit for over-the-air downloads.
This information can be found on page 58 of the iTunes Connect Developer Guide.
As of June 6, 2013
The above information is still the same with the exception of the Executable File size which is now limited to 60MB's. These changes can be found on page 237 of the guide.
As of January 10, 2013
The above information is still the same with the exception of the Executable File size which is now limited to 60MB's. These changes can be found on page 208 of the guide.
As of October 31, 2012
The above information is still the same with the exception of Over The Air downloads which is now 50MB's. These changes can be found on page 206 of the guide. Thanks to comment from Ozair Kafray.
As of July 19, 2012
The above information is still the same with the exception of Over The Air downloads which is now 50MB's. These changes can be found on page 214 of the guide. Thanks to comment from marsbear. In addition, the document has moved here:
http://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/iTunesConnect_Guide.pdf
As of July 13, 2012
The above information is still the same with the exception of Over The Air downloads which is now 50MB's. These changes can be found on page 209 of the guide.
As of March 29, 2012 (version 7.4)
The above information is still the same with the exception of Over The Air downloads which is now 50MB's. These changes can be found on page 209 of the guide.
As of January 23, 2012 (version 7.3)
The above information is still the same, however, it can be found on page 172 of the guide.
As of October 17, 2011 (version 7.2)
The above information is still the same, however, it can be found on page 180 of the guide. Thanks to comment from Luke for the update.
As of September 22, 2011 (version 7.1)
The above information is still the same, however, it can be found on page 179 of the guide. Thanks to comment from Saxon Druce for the update.