# ab Astrometry X vs PolyDelay

The clearest difference is price: PolyDelay at $1.99 against ab Astrometry X's $12.99. PolyDelay also leads on update cadence (every 3 months vs every 7 months). On rating, review sentiment, ratings volume and ads there is nothing between them.

ab Astrometry X costs $12.99 and PolyDelay $1.99 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 ab Astrometry X against 5.0 for PolyDelay. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

ab Astrometry X ships an update every 7 months, PolyDelay every 3 months. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | ab Astrometry X | PolyDelay |
| --- | --- | --- |
| Price | $12.99 | **$1.99** |
| Rating | [5.0 (6 ratings)](https://appshunter.io/ios/app/ab-astrometry-x/id6477390551/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/polydelay/id6751120958/reviews) |
| Number of ratings | **6** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 9 MB | 13 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Alejandro Cabrera Zuniga](https://appshunter.io/developer/1660382836) | [Rob Jackson](https://appshunter.io/developer/1072346998) |

## What reviewers say

### ab Astrometry X

[App page](https://appshunter.io/ios/app/ab-astrometry-x/id6477390551)

This advanced audio effect offers dynamic multitap delay with randomized tap positioning around the listener. Control tap viscosity, time, and loudness intuitively via an XY pad. Create custom delay lines by syncing to your DAW or using free time, in serial or parallel modes.

**Highlights:** Random tap positioning, Viscosity, Time, and Loudness control, Intuitive XY Pad design, DAW sync or free time, Serial or parallel mode

**Features:** Vision Pro support

**In-app purchases:** none


### PolyDelay

[App page](https://appshunter.io/ios/app/polydelay/id6751120958)

This audio effect plugin creates unique polyrhythmic delays and familiar delay patterns. It syncs to host tempo and offers advanced tone-shaping options like filters and modulation.

**Highlights:** Polyrhythmic delay calculations, Host tempo sync, Dual delay lines, Stereo width control, High and low pass filters, Stereo modulation, Internal limiting

**In-app purchases:** none


## Frequently asked questions

### Is ab Astrometry X free?

ab Astrometry X costs $12.99, with no in-app purchases.

### Is PolyDelay free?

PolyDelay costs $1.99, with no in-app purchases.

### Which has better reviews, ab Astrometry X or PolyDelay?

ab Astrometry X and PolyDelay are both rated 5.0 out of 5 on the App Store, from 6 and 3 ratings respectively.

### Do ab Astrometry X or PolyDelay have ads?

Neither ab Astrometry X nor PolyDelay shows ads.

### Which is updated more often, ab Astrometry X or PolyDelay?

ab Astrometry X ships an update every 7 months, and PolyDelay every 3 months. Most recently, ab Astrometry X was updated on September 8, 2026 and PolyDelay on September 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*