iStem vs REPUN

iStem lets you split songs into drums, bass, vocals, and other instruments, remix them, and practice with tempo/pitch/metronome controls. Features: - Split in instrument/vocal tracks - Detect beats - Count-in function - Speed up or slow down songs - Change pitch - Set up loops for detailed practice - No login or user data required - All computation is done on the device - Export to file

REPUN is an analog-minded chorus and vibrato processor for iPhone and iPad. Use it as a standalone audio app or insert the included AUv3 effect in a compatible host such as GarageBand. Its sound is built around BBD-style delay behavior, band limiting, compander contour, and controlled waveform instability. The result moves with tonal weight instead of sounding like a clean digital modulation layer placed on top of the source. FEATURES - BBD-style chorus and vibrato character - Free-running or host-tempo-synced modulation - Continuous dry-to-chorus-to-vibrato Mix control - Adjustable Rate and Depth - LFO Wave shaping - BREEZE drift and random-motion control - Instrument and line input modes - 2x and 4x processing modes - Standalone iOS/iPadOS app - AUv3 audio effect for compatible hosts TRY BEFORE UNLOCKING The working release model assumes 10 minutes of full-featured active use, shared between the standalone app and AUv3 extension. A one-time, non-consumable In-App Purchase unlocks unlimited use in both formats, with Restore Purchases available in the standalone app. Confirm this behavior in the production build before submission. REPUN works on guitars, keyboards, synthesizers, pads, drones, and melodic layers that need width, instability, or animated pitch movement.