DelayJaVu vs PhaseX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DelayJaVu
This audio effect plugin creates a unique stereo reverse delay sound. It captures your dry signal and plays it back in reverse, with independent control over left and right channel delay times, modulation, and stereo spread for creative sound design.
- Stereo reverse delay effect
- Independent L/R delay times
- Adjustable modulation
- Variable stereo spread
- AUv3 compatible
- Standalone operation
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DelayJaVu - Stereo Reverse Delay (AUv3) DelayJaVu is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic Pro or GarageBand. Overview Deja Vu - French for "already seen". The brief, intense and often startling sensation that a current, new experience has happened before. DelayJaVu is a stereo reverse delay with independent delay times for the left and right channels. DelayJaVu works by capturing your dry signal in a delay buffer, which is then read backwards over a time period corresponding to a delay time. As the virtual delay head repeatedly scans back through the delay buffer, you hear segments your original dry signal, repeated in reverse. I think reverse delay is a really cool effect - one of my favourites in fact! I especially like its slightly unpredictable nature, making it a great effect to interact with, as you play. I don't recall seeing any reverse delay plugins with independent times for the left and right channels so that may be something unique that DelayJaVu has to offer. And the addition of modulation and variable stereo spread adds further creative options, while keeping DelayJaVu compact, super easy to use and very DSP-friendly. Controls Mode - Off bypasses the effect and uses a "soft switching" aka "trails mode", to avoid pops and clicks. In L/R Lock mode, the delay time is set to be the same for the left and right channel, and the parameter sliders will be "locked" to the same value when changed. In L/R Free mode, you can set independent delay times for the left and right channel. Time L / R - Sets the delay time for the left and right channels independently, from 250ms to 2.5 seconds. Interesting effects can be achieved by setting the delay times to be close, but not exactly the same. Please note - Unlike a "normal" delay where you will hear the sound repeat after the delay time specified, DelayJaVu doesn't quite work like that. The delay heads for both channels are always in motion and repeat their cycles according to the delay time. This means that sometimes the delay head will be "closer" to the incoming audio. In this case you may hear the first repeat almost straight away, with subsequent repeats occurring at delay time intervals when the Feedback is > 0%. This is especially noticeable (and cool!) when running in Free mode with different delay times. This is also the way many reverse delays are implemented and why this particular design doesn't lend itself to tempo sync delay effects as the repeats will not "quantise" to note length boundaries. Feedback - Sets the feedback / regeneration for the delay on both channels. Mod - Adds a variable amount of modulation to both channels. As each channel is modulated differently, this can produce a nice stereo effect. Spread - At maximum, the left and right delay channels are hard-panned and have their own independent modulation applied. Decreasing the Spread parameter effectively narrows the stereo image of the delay and modulation all the way down to mono. Mix - The mix control goes from 100% dry to 100% wet. At the centre 50% position, the dry and wet signals are evenly balanced. At 100%, you only hear the wet / processed signal. For more info and support please visit: www.waverley-instruments.com/robjackson
PhaseX
This app offers a stereo phaser audio effect with three classic modes: MXR Phase 90, Phase 45, and Shin-ei Uni-Vibe. It allows for versatile sound shaping with simple parameters, providing classic and modern phaser sounds, including stereo phasing/vibrato as an alternative to chorus effects.
- Stereo phaser audio effect
- Three classic modes (MXR Phase 90, Phase 45, Uni-Vibe)
- Simple, versatile parameters
- Modern phaser sound extensions
- Stereo phasing/vibrato alternative to chorus
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PhaseX is an interpretation of classic phaser effects with beautiful stereo sound. It offers 3 basic modes: MXR Phase 90, Phase 45 and Shin-ei Uni-Vibe. Its simple parameters offer standard phaser sounds as well as great modern extensions, making it versatile yet self-explanatory. Choose between typical classic phasing, more gentle Uni-Vibe feeling or the more subtle, less dominant (underestimated) phase 45 sound. "Modify" the classics with the feedback setting and, as special cherry on your cake, discover stereo phasing/vibrato as a nice alternative to chorus effects, avoiding the chorus/flanger inherent "fuzziness" of attack transients.
Screenshots
Verdict
The clearest difference is update cadence: PhaseX at every 2 weeks against DelayJaVu's every 2 months. DelayJaVu's advantage is price ($1.99 vs $5.99) and iOS requirement (12.0 vs 17.6). On rating, ratings volume, ads and in-app purchases 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
DelayJaVu costs $1.99 and PhaseX $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for DelayJaVu against 5.0 for PhaseX. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
DelayJaVu ships an update every 2 months, PhaseX every 2 weeks. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.
| Parameter | DelayJaVu | PhaseX |
|---|---|---|
| Price | $1.99 — better | $5.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 13 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Rob Jackson | mattoncino software |
Customer experience
DelayJaVu
PhaseX
In-app purchases
DelayJaVu
No in-app purchases
PhaseX
No in-app purchases









