How to find out the size of my iOS app? Is it larger than the Cellular Download limit?

Xcode project says one thing, on my iPhone in the iPhone's setting under usage it gives a different size. I'm confused, don't know which to rely on. How do I find out for sure?

I've read to check the Binary size in App Store Connect. However, I'm not ready for distributing my app yet, I'm still testing so I don't want to dig deep into App Store Connect yet. What are my options?

Solution

You can see the estimated size (which is going to be close to exact with the App-store size of your app) of your project in 3 easy steps. I added images below.

1-Choose iOS Device as your Target Device.

2-Click Product>Archive.

3-After it compiles with no errors, The Organizer screen will Appear.

4-Click on Estimate Size in this screen.

enter image description here

UPDATE (June 2015)

The latest version of Xcode does not have the 'Estimated App Store Size' option within the 'Organizer' view. :(

Instead, Once your app is ready for distribution, archive the app. In the Organizer, select the Archives tab. Select your app in the left hand column. Select the latest archive in the middle column. Hit the Export button in the right hand column. Select Save for iOS App Store Deployment. Check file size in the Finder.