ab vortEx X vs PhaseII
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ab vortEx X
This app is a stereo-only abstract spacetime designer for creating unique reverberations. It functions as an AUv3 plugin for compatible iOS hosts or as a standalone application, offering control over sound reflection spread.
- Stereo-only spatial audio algorithms
- AUv3 plugin compatibility
- Standalone application mode
- Touch screen interface
- Control over sound reflection spread
- Space, Time, Viscosity, Volumes controls
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'ab vortEx X' for iOS is a 'Light', stereo-only version of 'ab vortEx', an abstract spacetime designer for creating infinite variations of reverberations using our Spatial Audio algorithms under the hood. 'ab vortEx' for iOS comes as an AUv3 Plugin and is compatible with any iOS host that supports AUv3 (e.g. Garageband). The plugin contains a minimalist interface, compatible with Touch Screens - as you move through the screen, you can control how the algorithm works and how the reflections of the sound spread through time and space. 'ab Vortex X' also works as a stand-alone application (make sure you wear headphones or use a soundcard). 'ab vortEx X' supports Stereo signals and contains the most critical controls of 'ab Vortex' (Space, Time, Viscosity and Volumes) for providing quick ways to manipulate your sound.ab vortEx' for iOS works with Mono and Stereo signals.
PhaseII
This audio effect plugin offers a dual stereo phaser with a vintage sound. It allows for independent phasing engines in parallel or series, with selectable modes for subtle to extreme effects. Controls include rate, depth, width, drive, and mix for versatile sound shaping.
- Dual stereo phasing engines
- Parallel and series processing modes
- Selectable effect modes (subtle to extreme)
- Adjustable rate, depth, and width
- Optional drive for analog warmth
- Soft limiting to prevent clipping
- Mix control for wet/dry balance
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PhaseII Dual Stereo Phaser Plugin (AUv3) PhaseII is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic Pro, GarageBand or AUM. Overview PhaseII is a dual stereo phasing machine with a vintage vibe! As well as traditional super-wide stereo phasing effects, PhaseII can also produce all manner of swirly modulated goodness by running the independent phasing engines in parallel or series. Selectable modes allow quick access to finely-tuned settings under the hood that "just work", from subtle to extreme - just the thing if you find some phasers to be overly complex with too many parameters! Set Rate and Depth to taste, adjust the stereo Width, then you can even add some gritty Drive for some "analog" warmth. Controls Active - Bypasses the effect (Off) or selects one of the following processing modes: Stereo - Two independent phasers for the left and right channel, with LFOs 90 degrees out of phase for a stereo effect, determined by the Width control. Parallel - Two independent stereo phasers for the incoming audio, which are then summed together at the output stage. The LFOs for each of the four phasers are 90 degrees out of phase for a stereo effect, determined by the Width control. Series - Two independent stereo phasers with Phase I processing incoming audio, which is then passed on to Phase II for a double-helping of phasey goodness at the output stage! This is potentially the most dramatic phasing effect, especially with the Width set to maximum as each of the four phaser LFOs are 90 degrees out of phase. The following controls apply to each phase stage, referred to as Phase I or Phase II: Phase I/II - Toggles the Phase I or Phase II processing engine On or Off. Rate - Sets the rate of the phaser LFO in Hz. Depth - Sets the depth of the phase effect. Mode - Selects one of four different modes. Each mode configures several "under the hood" settings - think of each mode as a mini preset for internal parameters. Modes range from subtle (I) to extreme! (IV). The following controls are global: Width - Adjusts the stereo width from super-wide to monophonic. Note this only adjusts the "wet" phased sound so your original stereo image remains intact for the "dry" signal. Drive - Applies an optional amount of warm overdrive to the phaser processing only, for a bit of a vintage vibe! Mix - Balances the processed audio with the incoming / dry signal. At zero, the output is totally dry, and at 100%, the output is totally wet and phased to the max! The phasing effect can sometimes create loud resonant frequency peaks that could result in clipping. To protect against this, soft limiting is applied at both the phasing processing stage and at the final summed output. If the input levels are high, this can add to the "analog" like sound of PhaseII when compression and saturation occurs. About The UI Not everyone likes the UIs of my latest (2025) plugins - I get it. However, the simplistic and generic approach allows me to (a) 99% focus on the DSP, sound quality and CPU performance, and (b) significantly reduce the development (and potential maintenance) time, which is reflected in my pricing. For more info and support please visit: www.waverley-instruments.com/robjackson
Screenshots
Verdict
The clearest difference is price: PhaseII at $1.99 against ab vortEx X's $12.99. PhaseII also leads on rating (5.0 vs 4.6) and update cadence (every 9 days vs every 2 months). ab vortEx X's advantage is ratings volume (8 vs 2). On ads, in-app purchases, monetization model and device support 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
ab vortEx X costs $12.99 and PhaseII $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PhaseII holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews point the same way: 88% of ab vortEx X's written reviews are positive against 100% of PhaseII's.
ab vortEx X ships an update every 2 months, PhaseII every 9 days. The most recent releases landed on September 24, 2026 and October 15, 2026 respectively.
| Parameter | ab vortEx X | PhaseII |
|---|---|---|
| Price | $12.99 | $1.99 — better |
| Rating | 4.6 (8 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 87.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 8 — better | 2 |
| Update frequency | Every 2 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11 — better | 12.0 |
| Further details — not scored | ||
| Size | 7 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Alejandro Cabrera Zuniga | Rob Jackson |
Customer experience
ab vortEx X
PhaseII
In-app purchases
ab vortEx X
No in-app purchases
PhaseII
No in-app purchases









