# PaulXStretch — Extreme Time Stretching

> Extreme audio time-stretching algorithm for ambient music and sound design. (iPhone/iPad app by Sonosaurus LLC.)

- Source: https://appshunter.io/ios/app/paulxstretch/id1619014008 (this page in markdown: same URL + `.md`)
- Developer: [Sonosaurus LLC](https://appshunter.io/developer/338977569)
- Category: Music
- Price: Free
- Rating: 4.90/5 from 72 App Store ratings · 34 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.3 · 17 MB
- Released: 2022-11-28
- Data updated: 2026-08-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/paulxstretch/id1619014008/reviews.md

## What is PaulXStretch?

This application and AUv3 plugin is based on the PaulStretch algorithm, (Paul’s Extreme Time Stretch, originally developed by Nasca Octavian Paul), and specifically the PaulXStretch version from Xenakios. The UI has been updated and adapted for various platforms and screen sizes.

The plugin/application is most suitable for radical transformation of sounds. It is *not* designed for subtle time or pitch corrections! Ambient music and sound design are probably the most suitable use cases. It can turn any short audio into an hours long ambient soundscape without batting an eye!

You can get audio into it either by using the "Capture" feature, or by loading an existing audio file. Once you have something in there, then you can start tweaking all the parameters, choose the portion of the audio to use and loop over, etc. Be sure to press the play button inside to enable the processing. To get your audio out, you can do an offline render of the output to a file (where all parameters are fixed), or you can do a live recording of your session to capture the output as you hear it. Either way, you can then share or access the saved audio from the Files app or by sharing it.

The AUv3 plugin version has the same capabilities, except you can feed it the live input of your choice (to capture internally for stretching).

This software is free, please enjoy it!

## Key features

- Extreme time stretching algorithm
- AUv3 plugin support
- Radical sound transformation
- Ambient music and sound design focus
- Capture audio or load files
- Offline rendering and live recording
- Adjustable looping and parameters

## Recent user reviews (10 of 34)

All indexed reviews: https://appshunter.io/ios/app/paulxstretch/id1619014008/reviews.md

### 5/5 — Wow

*2026-06-21*

This is fantastic for sound scapes.  Top draw.   Thank you.

### 2/5 — good app, but I can’t access anymore

*2026-05-31*

i loved using this app to make some good old ambient music, but I’ve now found that whenever I try to render or do ANYTHING with the app, it will crash on me. ruins a perfect experience, honestly. if constant crashing could be fixed, this app would definitely get five stars

### 5/5 — Wonderful

*2026-05-24*

Actually amazed by the dev who offers this for free.. works totally fine and the design has gotten so much better. Thank you lots for this marvelous app fren

### 5/5 — Incredible

*2026-05-09*

It’s quite astounding what this can do. I know of no other app or device which can manipulate the speed of a track like this without aliasing. Two thumbs up.

### 5/5 — I like it

*2026-02-14*

cooll

### 5/5 — Excellent tool!

*2025-12-08*

Finally, an app that does what it promises and is straightforward to use. The only thing I would like to see added are mute and solo buttons in the ratio mixer.
And, by the way, the app doesn't suck up any data, so it definitely deserves five stars!!!

### 5/5 — Thank you for being awesome

*2025-05-24*

In a world full of mediocre services, abusive data collection and ad spamming, PaulXStretch stands tall.
A marvel for sound design, the stretching algorithm is unlike anything I’ve heard.
All that in a multi-platform free app with no ads or data harvesting.
Hats off Sonosaurus !!!

### 5/5 — One of my all-time favs

*2025-05-20*

This plugin is one of the joys of my life. Too bad it no longer is available after the last iOS update.

### 5/5 — Merveilleux

*2025-02-10*

Beau travail merci

### 5/5 — Fantastic!

*2025-01-29*

5 stars!!!

## Frequently asked questions about PaulXStretch

### What does PaulXStretch do?

PaulXStretch is an application and AUv3 plugin that utilizes the PaulStretch algorithm for extreme audio time stretching. It is designed for radical sound transformation, making it ideal for creating ambient music and soundscapes by stretching short audio clips into very long durations.

### What are the key features of PaulXStretch?

Key features include its extreme time-stretching algorithm, suitability for ambient music and sound design, the ability to capture audio or load files, parameter tweaking, adjustable looping, offline rendering, and live recording. It also offers an AUv3 plugin version with similar capabilities.

### Is PaulXStretch free to use?

Yes, this software is completely free to use. There are no costs associated with downloading or utilizing its features for your audio manipulation needs.

### What kind of audio transformations can I achieve?

This app is best suited for radical transformations rather than subtle pitch or time corrections. You can turn short audio samples into hours-long ambient soundscapes, making it perfect for experimental sound design and creating immersive atmospheric audio.

### How do I get audio into the app and export it?

You can get audio into the app by using the 'Capture' feature or by loading an existing audio file. Once processed, you can export your stretched audio through an offline render to a file or by doing a live recording of your session. The saved audio can then be accessed via the Files app or shared.

## Version history (last 1 release)

### 1.6.1 — 2022-11-28

No release notes.

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## More apps by Sonosaurus LLC

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- [yaleD - Reverse Delay](https://appshunter.io/ios/app/yaled-reverse-delay/id1477503080)
- [SonoBus](https://appshunter.io/ios/app/sonobus/id1523236365)

All apps by Sonosaurus LLC: https://appshunter.io/developer/338977569

## Related topics

[antescofo](https://appshunter.io/ios/topics/antescofo) · [auv3 free](https://appshunter.io/ios/topics/auv3-free)

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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 2026-08-18.*