# variStretch — real-time time stretch

> Real-time audio time-stretching and pitch shifting application. (iPhone/iPad app by Satoshi Kajii.)

- Source: https://appshunter.io/ios/app/varistretch/id6744925479 (this page in markdown: same URL + `.md`)
- Developer: [Satoshi Kajii](https://appshunter.io/developer/1777441634)
- Category: Music
- Price: $5.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 15 MB
- Released: 2025-04-22
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/varistretch/id6744925479/reviews.md

## What is variStretch?

Concept:

The app is a so-called time-stretch machine. The user can change the speed (0.5-2.0) of audio source in real-time using keyboard or slider at will. 

Usage:

There are three play modes:

1) Tape (to change the both speed & pitch)
2) Phase Vocoder (to change the speed alone) 
3) Thru (no processing)

"Buffer Size" slider determines how long the data will be stored.
"Buffer Clear" button will reset the buffer to be zero.

System Requirements:

AUv3 host

## Key features

- Real-time speed adjustment (0.5-2.0x)
- Tape mode (speed & pitch change)
- Phase Vocoder mode (speed only)
- Adjustable buffer size
- Buffer clear function
- AUv3 host compatibility


## Frequently asked questions about variStretch

### What is variStretch?

variStretch is a real-time audio time-stretch machine that allows users to change the speed of audio sources between 0.5x and 2.0x. It offers different modes for manipulating both speed and pitch, or just speed.

### What are the different playback modes in variStretch?

variStretch offers three playback modes: 'Tape' which changes both speed and pitch, 'Phase Vocoder' which changes only the speed, and 'Thru' which provides no processing.

### How does variStretch handle audio processing?

The app uses a 'Buffer Size' slider to determine how long audio data is stored for processing. A 'Buffer Clear' button is also available to reset the buffer.

### What devices is variStretch compatible with?

variStretch is designed for iPhone, iPad, and iPod touch devices. It requires an AUv3 host to function.

### What is the price of variStretch?

variStretch is a paid application, available for $5.99. There are no in-app purchases or advertisements.

### Does variStretch have ads?

No, variStretch does not contain advertisements. It is a paid application with a one-time purchase price.

### How often is variStretch updated?

The latest version of variStretch is 1.0.1, last updated on June 2, 2025. It was initially released on April 22, 2025.

### What is the age rating for variStretch?

variStretch has an age rating of 4+, making it suitable for a wide range of users. The app focuses on audio manipulation features.

## Version history (last 3 releases)

### 1.0.2 — 2026-07-10

DSP performance in the section of phase vocoder is improved (less CPU-hungry).

### 1.0.1 — 2025-06-02

Minor bug fixed:
1. There was a bug in the section “phase vocoder”, which caused artifact tiny noise. Now fixed!

### 1.0 — 2025-04-22

No release notes.

## Apps similar to variStretch

| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [FFT AUv3 Visualizer](https://appshunter.io/ios/app/fft-auv3-visualizer/id6746331702) | 5.0 (1) | $0.99 | Music |
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| [Superior Drive](https://appshunter.io/ios/app/superior-drive/id6745561803) | 5.0 (3) | $12.99 | Music |
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## More apps by Satoshi Kajii

- [StereoLoco](https://appshunter.io/ios/app/stereoloco/id6737751583)
- [shortReverse](https://appshunter.io/ios/app/shortreverse/id6738296410)
- [Jacquardi](https://appshunter.io/ios/app/jacquardi/id6738633198)
- [DeDrummer](https://appshunter.io/ios/app/dedrummer/id6744193942)
- [pitchBender](https://appshunter.io/ios/app/pitchbender/id6744398563)
- [DeHiss](https://appshunter.io/ios/app/dehiss/id6744572519)

All apps by Satoshi Kajii: https://appshunter.io/developer/1777441634

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*