AudioStretch

Why does your music library contain songs that fade out just when the groove hits?

AudioStretch by BandLab Technologies gives you the power to control tempo and pitch independently, turning any audio file into a flexible practice, remix, or analysis tool. Whether you are learning a complex guitar solo, transcribing a vocal run, or adjusting a backing track to your vocal range, this app provides precise, real-time audio manipulation without degrading sound quality.

Core Capabilities & Tools

• Independent Tempo & Pitch Control – Slow down audio from 0.25x to 4x speed without altering pitch. Shift pitch up or down by up to 12 semitones without changing tempo. Use the fine-tune slider for micro-adjustments in cents (1/100 of a semitone).
• Real-Time Processing – Apply changes instantly while the audio plays. No pre-rendering or export required. Adjust parameters on the fly during playback to match your ear.
• High-Fidelity Time Stretching Engine – Proprietary algorithm preserves transients and formants, preventing the "chipmunk" or "robotic" artifacts common in basic pitch shifters. Works with MP3, WAV, FLAC, AIFF, M4A, and more.
• Loop & A-B Repeat – Set start and end points (A and B) to isolate a specific section. Loop the segment indefinitely for focused practice or transcription. Fine-tune loop boundaries with waveform zoom.
• Waveform Visualization – See the full audio waveform with zoomable timeline. Tap to jump to any position. Use pinch-to-zoom for millisecond precision when setting loop points.
• Preset Memory Slots – Save up to 10 custom combinations of tempo and pitch settings. Recall them instantly for different tasks: one preset for slow guitar practice, another for vocal pitch correction.
• Export & Share – Export the processed audio as a new file (WAV or MP3) with all changes baked in. Share directly to other apps, cloud storage, or social media.
• Background Playback – Continue processing audio while the app is minimized or your screen is off. Useful for long practice sessions or transcription work.
• File Management – Import audio from your device library, cloud services (Google Drive, Dropbox, OneDrive), or directly from a web browser. Organize files into custom playlists within the app.
• No Internet Required for Core Functions – All processing happens locally on your device. No streaming, no latency, no data usage.

Key Advantages for Musicians & Audio Enthusiasts

• Practice Tool – Slow down fast passages to 50% speed while retaining original pitch. Learn solos, runs, and fills note-by-note.
• Transcription Aid – Isolate and loop tricky sections. Shift pitch to match your instrument’s tuning.
• Vocal Warm-Up & Pitch Training – Shift a backing track up or down to match your vocal range without affecting tempo.
• Remix & Mashup Prep – Extract stems by adjusting tempo and pitch independently. Export processed files for use in DAWs.
• Accessibility – Adjust playback speed for audiobooks, lectures, or language learning with pitch preserved for clarity.
• No Subscription – One-time purchase unlocks full functionality. No recurring fees.

Consider downloading AudioStretch if you need a reliable, low-latency tool for tempo and pitch manipulation that works offline and supports a wide range of audio formats.

Download the mobile app now.

Internet required for initial download and cloud imports only. In-app purchases available for premium features.