JAX vs REPUN
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
JAX
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Introduction price is available for a short time. We have harnessed Appleβs cutting-edge hardware and native programming frameworks to create an Audio Unit that is truly unparalleled. From floating-point vector registers and Metal Performance Shaders to shared memory between the Audio DSP kernel and the GPU... However β since all of this might sound a bit too technical β we didn't simply use these technologies as a means to an end; instead, we wrapped them in a musically meaningful and beautiful concept. JAX 'Walking On A Rainbow' is our answer to classic frequency analysis tools β featuring a consistently musical implementation designed for real-time processing, imbued with a certain imaginative charm. The songs we composed specifically for this purpose serve to underscore this very concept: βOpen your mind and you'll find it's like magic. When you take a step. Oh I'm walking on a rainbow. Walking on a rainbow!β WE ARE FRONTIERS. You can expect more to cone and - you are welcome to join us. Technical Note: The AudioUnit is smaller than 8 MB and consumes less than 1% of CPU power on an Apple M4 chip. No bloated third-party frameworks were used; this is a native development aligned as closely as possible with Apple's latest hardware (silicon). The manual is available on our website at: https://audio.digitster.com/wp-content/uploads/2026/05/JAX-Walking-On-A-Rainbow.pdf
REPUN
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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.
Screenshots
Verdict
The clearest difference is price: REPUN at Free against JAX's $9.99. JAX's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
REPUN is free to download; JAX costs $9.99 up front. REPUN sells 1 one-off in-app purchase. JAX asks for nothing beyond the download.
| Parameter | JAX | REPUN |
|---|---|---|
| Price | $9.99 | Free β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 16.0 β better |
| Further details β not scored | ||
| Size | 128 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Guell | Shoma Kondo |
In-app purchases
JAX
No in-app purchases
REPUN
- REPUN Full Version$6.99









