PaulXStretch vs Filterjam
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PaulXStretch
Transform audio into extended ambient soundscapes with this powerful time-stretching tool. Ideal for sound design and ambient music creation, it can stretch short clips into hours of audio. Capture sounds or load files, then manipulate parameters for radical sonic transformations.
- 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
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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!
Filterjam
This app offers a multiband resonant filter for creating unique audio effects. It divides input signals into four bands, allowing for various sonic manipulations from subtle enhancements to extreme sound mangling.
- Multiband resonant filtering
- 4-band signal division
- Sum or multiply band modes
- Versatile sound shaping
- Ringmod-like effects
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Filterjam is a multi-band resonant filter delivering weird ringmod-like filtered sounds. The input signal is divided into 4 bands that are then summed or multiplied together according to the selected mode. Filterjam can be very harsh or gentle, it can add brightness or depth to synth sounds, but it can also completely mangle acoustic sources.
Screenshots
Verdict
PaulXStretch and Filterjam both sit at 4.9 stars, but that hides the real split: 94% of PaulXStretch's written reviews are positive against 83% of Filterjam's. PaulXStretch also leads on iOS requirement (9.3 vs 14.0). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for PaulXStretch against 5.0 for Filterjam. Both are backed by a comparable volume of ratings — 72 and 34 respectively. Written reviews are what separate them: 94% of PaulXStretch's written reviews are positive against 83% of Filterjam's.
| Parameter | PaulXStretch | Filterjam |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (72 ratings) | 5.0 (34 ratings) — better |
| Positive reviews | 94.1% of reviews — better | 83.3% of reviews |
| Number of ratings | 72 — better | 34 |
| Update frequency | — | Every 22 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 — better | 14.0 |
| Further details — not scored | ||
| Size | 17 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Sonosaurus LLC | AudioThing Ltd. |
Customer experience
PaulXStretch
Filterjam
In-app purchases
PaulXStretch
No in-app purchases
Filterjam
No in-app purchases







