# D vs Reef Analysis

The clearest difference is update cadence: Reef Analysis at every 3 days against D's fortnightly. D's advantage is iOS requirement (12.0 vs 15.0). 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, Reef Analysis every 3 days. The most recent releases landed on September 29, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | D | Reef Analysis |
| --- | --- | --- |
| 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 days** |
| Monetization | Free | — |
| Size | 13 MB | 10 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [D-D The Aquarium Solution Limited](https://appshunter.io/developer/1435999272) | [Ark Technology Ltd](https://appshunter.io/developer/6781222453) |

## 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


### Reef Analysis

[App page](https://appshunter.io/ios/app/reef-analysis/id6781222451)

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is Reef Analysis free?

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

### Do D or Reef Analysis have ads?

Neither D nor Reef Analysis shows ads.

### Which is updated more often, D or Reef Analysis?

D ships an update fortnightly, and Reef Analysis every 3 days. Most recently, D was updated on September 29, 2026 and Reef Analysis on September 19, 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.*