FiriVoice: Video Voice Changer is a professional yet user-friendly iPhone app designed for altering voices in video and audio files. With a diverse library of voice options ranging from Robot to Devil to Underwater, this app offers a wide range of voice-changing possibilities. The app ensures studio-quality voice alterations with real-time performance and secure local processing of files on your device.

The app also features an audio recorder for capturing high-quality audio, pitch adjustment for creating unique voice effects, and support for various video and audio formats. Users can save and share their modified audio/video files easily, with the free version allowing voice changes for the first 2 minutes of videos. For unlimited features, users can opt for the pro version after exploring the app's capabilities.