# CC Harp vs GSDSP Quantum Delay

The clearest difference is price: CC Harp at Free against GSDSP Quantum Delay's $14.99. GSDSP Quantum Delay's advantage is in-app purchases (none vs 2) and update cadence (every 6 weeks vs every 4 months). On rating, ads, device support and iOS requirement there is nothing between them.

CC Harp is free to download; GSDSP Quantum Delay costs $14.99 up front. CC Harp sells 2 one-off in-app purchases. GSDSP Quantum Delay asks for nothing beyond the download.

CC Harp holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: GSDSP Quantum Delay has 17 ratings behind it against 1, so its average is the more settled of the two.

CC Harp ships an update every 4 months, GSDSP Quantum Delay every 6 weeks. The most recent releases landed on October 12, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | CC Harp | GSDSP Quantum Delay |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cc-harp/id1526785348/reviews)** | [4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews) |
| Number of ratings | 1 | **17** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 17 MB | 94 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kazuo Kamata](https://appshunter.io/developer/1526785350) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### CC Harp

[App page](https://appshunter.io/ios/app/cc-harp/id1526785348)

This app simulates a 10-hole diatonic harmonica, offering expressive sound capabilities with intuitive touch controls. It allows for pitch bends, tremolo effects, and even chord play. Additional features like multiple keys, a tuner, and various sound effects are available through in-app purchases.

**Highlights:** 10-hole diatonic harmonica simulation, Independent and adjacent sound touches, Smart chord play with two fingers, Pitch bends and sound muffling, Adjustable tremolo effect, Left-handed screen reversal, Dark mode support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra Features Trial | Free | one-time |
| Extra Features | $3.99 | one-time |


### GSDSP Quantum Delay

[App page](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297)

This app offers a vintage-inspired stereo delay effect with advanced modulation, flexible filtering, and precise timing controls. It allows users to sculpt unique echo textures, from warm analog sounds to complex, evolving soundscapes.

**Highlights:** Vintage-inspired stereo delay, Deep modulation system, Flexible filtering (LPF, HPF, BPF), Precise timing controls (BPM, ms), Switchable stereo/dual mono modes, Advanced modulation sources (LFO, Random, Envelope)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CC Harp free?

CC Harp is free to download, with in-app purchases available.

### Is GSDSP Quantum Delay free?

GSDSP Quantum Delay costs $14.99, with no in-app purchases.

### Which has better reviews, CC Harp or GSDSP Quantum Delay?

CC Harp is rated higher. CC Harp averages 5.0 out of 5 from 1 ratings, while GSDSP Quantum Delay averages 4.8 from 17 ratings.

### Do CC Harp or GSDSP Quantum Delay have ads?

Neither CC Harp nor GSDSP Quantum Delay shows ads.

### Which is updated more often, CC Harp or GSDSP Quantum Delay?

CC Harp ships an update every 4 months, and GSDSP Quantum Delay every 6 weeks. Most recently, CC Harp was updated on October 12, 2026 and GSDSP Quantum Delay on October 27, 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.*