# D vs Aqua Docs

The clearest difference is review sentiment: Aqua Docs at 100% against D's 7%. Aqua Docs also leads on rating (4.8 vs 1.5) and ratings volume (8 vs 2). D's advantage is iOS requirement (12.0 vs 15.1). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Aqua Docs holds the better App Store score, 4.8 against 1.5. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews point the same way: 7% of D's written reviews are positive against 100% of Aqua Docs's.

D ships an update fortnightly, Aqua Docs every 3 weeks. The most recent releases landed on September 29, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | D | Aqua Docs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/d-d-h2ocean/id1435999273/reviews) | **[4.8 (8 ratings)](https://appshunter.io/ios/app/aqua-docs/id6746091301/reviews)** |
| Number of ratings | 2 | **8** |
| Positive reviews | 6.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free | Free |
| Size | 13 MB | 90 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) | [Octoro Limited](https://appshunter.io/developer/1636631583) |

## 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


### Aqua Docs

[App page](https://appshunter.io/ios/app/aqua-docs/id6746091301)

Manage your aquarium with this free platform. Track parameters, dosages, and livestock, and engage with a community of fellow enthusiasts. Earn rewards for contributions and share your experience.

**Highlights:** Tank Management, Parameter Tracking, Dosage Tracking, Live Stock Profiles, Community Database, User Rewards

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is Aqua Docs free?

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

### Which has better reviews, D or Aqua Docs?

Aqua Docs is rated higher. D averages 1.5 out of 5 from 2 ratings, while Aqua Docs averages 4.8 from 8 ratings.

### Do D or Aqua Docs have ads?

Neither D nor Aqua Docs shows ads.

### Which is updated more often, D or Aqua Docs?

D ships an update fortnightly, and Aqua Docs every 3 weeks. Most recently, D was updated on September 29, 2026 and Aqua Docs on September 30, 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.*