# RP vs Crystals Harmonizer®

The clearest difference is rating: Crystals Harmonizer® at 4.6 against RP's 3.9. Crystals Harmonizer® also leads on review sentiment (92% vs 70%). RP's advantage is price ($5.99 vs $14.99) and iOS requirement (9.0 vs 11.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

RP costs $5.99 and Crystals Harmonizer® $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Crystals Harmonizer® holds the better App Store score, 4.6 against 3.9. Both are backed by a comparable volume of ratings — 15 and 20 respectively. Written reviews point the same way: 70% of RP's written reviews are positive against 92% of Crystals Harmonizer®'s.

RP ships an update every 2 months, Crystals Harmonizer® every 3 months. The most recent releases landed on October 17, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | RP | Crystals Harmonizer® |
| --- | --- | --- |
| Price | **$5.99** | $14.99 |
| Rating | [3.9 (15 ratings)](https://appshunter.io/ios/app/rp-1-delay/id1079530569/reviews) | **[4.6 (20 ratings)](https://appshunter.io/ios/app/crystals-harmonizer/id1504257443/reviews)** |
| Number of ratings | 15 | **20** |
| Positive reviews | 70.0% of reviews | **92.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 13 MB | 15 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Eventide](https://appshunter.io/developer/546518026) |

## What reviewers say

### RP

[App page](https://appshunter.io/ios/app/rp-1-delay/id1079530569)

This app offers dual stereo delay lines for a vast array of audio effects, from simple echoes to complex soundscapes. It features individual bypass, modulation routing, and tempo synchronization options.

**Highlights:** Dual stereo delay lines, High- and Lowpass filters, Stereo spread and Looping, Separate modulation delay, Tempo sync via AudioUnit Host or Ableton Link, Delay times from 10ms to 2000ms

**Features:** Vision Pro support

**In-app purchases:** none


### Crystals Harmonizer®

[App page](https://appshunter.io/ios/app/crystals-harmonizer/id1504257443)

This app offers advanced pitch shifting, delay, and reverb effects inspired by a classic hardware unit. Create expansive, modulated soundscapes for instruments and vocals, with real-time control over parameters.

**Highlights:** Twin reverse pitch shifters, Reverse granular delays, Real-time RIBBON control, Octave up FLEX button, Long decay reverb, Musical micro-pitching, Standalone and AUv3 plugin

**In-app purchases:** none


## Frequently asked questions

### Is RP free?

RP costs $5.99, with no in-app purchases.

### Is Crystals Harmonizer® free?

Crystals Harmonizer® costs $14.99, with no in-app purchases.

### Which has better reviews, RP or Crystals Harmonizer®?

Crystals Harmonizer® is rated higher. RP averages 3.9 out of 5 from 15 ratings, while Crystals Harmonizer® averages 4.6 from 20 ratings.

### Do RP or Crystals Harmonizer® have ads?

Neither RP nor Crystals Harmonizer® shows ads.

### Which is updated more often, RP or Crystals Harmonizer®?

RP ships an update every 2 months, and Crystals Harmonizer® every 3 months. Most recently, RP was updated on October 17, 2026 and Crystals Harmonizer® on October 14, 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.*