Unpublished rules and clarifications from Apple's App Review team that can cause your iPhone app to be rejected.
Are we missing one of your rejection reasons that other developers may not know about? Submit it.
The recent removal of Google Voice apps has brought this to everyone’s attention again. Many of us had forgotten since the Podcaster rejection first taught us about this rule.
Your app cannot substantially overlap or replace built-in functionality. You can’t make a phone-call app or an email client or an MP3 player or a podcast downloader.
This is a slippery slope, and we have too few data points to understand the nuances of this rule. Generally, stay out of Apple’s way and don’t compete directly with a built-in app. If your app does something that Apple is unlikely to care about themselves because it’s too specialized or appeals to an audience smaller than “everyone”, you’re probably safe.
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