# D vs CoralSync

The clearest difference is update cadence: D at fortnightly against CoralSync's every 3 months. D also leads on iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

D ships an update fortnightly, CoralSync every 3 months. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | D | CoralSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.5 (2 ratings)](https://appshunter.io/ios/app/d-d-h2ocean/id1435999273/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 6.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Free | — |
| Size | 13 MB | 64 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [D-D The Aquarium Solution Limited](https://appshunter.io/developer/1435999272) | [Huizhou Abi Technology Co.,Ltd](https://appshunter.io/developer/1785595077) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-d-h2ocean/id1435999273)

Control your D-D H2Ocean Dosing Pumps for marine reef aquariums. Automate the addition of essential elements by setting dosing frequency and volume for each channel. Monitor your dosing solution levels in real-time.

**Highlights:** WIFI control for dosing pumps, Automatic element addition, Set dosing frequency, Set dosing volume per channel, Real-time solution level monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### CoralSync

[App page](https://appshunter.io/ios/app/coralsync/id6737188794)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is D free?

D is free to download, with no in-app purchases.

### Is CoralSync free?

CoralSync is free to download, with no in-app purchases.

### Do D or CoralSync have ads?

Neither D nor CoralSync shows ads.

### Which is updated more often, D or CoralSync?

D ships an update fortnightly, and CoralSync every 3 months. Most recently, D was updated on September 29, 2026 and CoralSync on October 1, 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.*