Vocaroo is not available for iPhone but there are a few alternatives with similar functionality. The best iPhone alternative is Clyp. It's not free, so if you're looking for a free alternative, you could try SpeakPipe or Chirbit. If that doesn't suit you, our users have ranked eight alternatives to Vocaroo and three of them are available for iPhone so hopefully you can find a suitable replacement.
Vocaroo is mainly a Audio Recorder but alternatives to it may also be Customer Feedback Managers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Vocaroo.
Chirbit is a useful and fun tool that enables you to record, upload and share your voice or audio files easily. Record your voice using a webcam or microphone connected to your computer, or upload an existing audio file.