# D vs TUNZE

The clearest difference is ads: D at none against TUNZE's shown. D also leads on monetization model (free vs free with in-app purchases) and update cadence (fortnightly vs every 2 months). TUNZE's advantage is ratings volume (7 vs 2). On price, rating, review sentiment 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.

On the App Store both sit at effectively the same score — 1.5 for D against 1.6 for TUNZE. Both are backed by a comparable volume of ratings — 2 and 7 respectively. Written reviews are what separate them: 7% of D's written reviews are positive against 0% of TUNZE's.

D ships an update fortnightly, TUNZE every 2 months. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | D | TUNZE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/d-d-h2ocean/id1435999273/reviews) | **[1.6 (7 ratings)](https://appshunter.io/ios/app/tunze/id6499044488/reviews)** |
| Number of ratings | 2 | **7** |
| Positive reviews | **6.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 67 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [D-D The Aquarium Solution Limited](https://appshunter.io/developer/1435999272) | [fynix GmbH](https://appshunter.io/developer/1733023937) |

## 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


### TUNZE

[App page](https://appshunter.io/ios/app/tunze/id6499044488)

Control TUNZE devices like pumps and controllers from a central app. It offers analysis and maintenance features for marine aquariums, helping to stabilize water chemistry and technology for a healthy environment.

**Highlights:** Centralized device control, Pump and controller management, Intelligent accessory features, Water chemistry analysis, Maintenance tracking, Marine aquarium companion

**Features:** macOS Compatibility, Family Sharing

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is TUNZE free?

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

### Which has better reviews, D or TUNZE?

TUNZE is rated higher. D averages 1.5 out of 5 from 2 ratings, while TUNZE averages 1.6 from 7 ratings.

### Do D or TUNZE have ads?

TUNZE shows ads; D does not.

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

D ships an update fortnightly, and TUNZE every 2 months. Most recently, D was updated on October 15, 2026 and TUNZE on October 24, 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.*