# Smart Reef vs D

The clearest difference is in-app purchases: D at none against Smart Reef's 11. D also leads on update cadence (every 2 weeks vs every 3 months) and iOS requirement (12.4 vs 14.6). Smart Reef's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Smart Reef sells 8 one-off in-app purchases. D asks for nothing beyond the download.

Smart Reef ships an update every 3 months, D every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Smart Reef | D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.5 (23 ratings)](https://appshunter.io/ios/app/smart-reef/id1480355166/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 3.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 66 MB |
| Requires iOS | 14.6 | **12.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reef Factory sp. z o.o.](https://appshunter.io/developer/1367901113) | [D-D The Aquarium Solution Limited](https://appshunter.io/developer/1435999272) |

## What reviewers say

### Smart Reef

[App page](https://appshunter.io/ios/app/smart-reef/id1480355166)

Manage your marine aquarium with this app. It provides device management, alerts for issues, and detailed historical data. A central dashboard offers a clear overview of your aquarium's status and device operations.

**Highlights:** Device management, Aquarium alerts, Measurement history, Operational status dashboard, Planned job journal, Preset sharing

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Warranty 3 years | $12.99 | one-time |
| Warranty 3 years | $17.99 | one-time |
| Warranty 3 years | $19.99 | one-time |
| Warranty 3 years | $24.99 | one-time |
| Warranty 3 years | $29.99 | one-time |
| Warranty 3 years | $34.99 | one-time |
| Warranty 3 years | $39.99 | one-time |
| Warranty 3 years | $49.99 | one-time |


### D

[App page](https://appshunter.io/ios/app/d-d-spektrum/id6751134398)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smart Reef free?

Smart Reef is free to download, with in-app purchases available.

### Is D free?

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

### Do Smart Reef or D have ads?

D shows ads; Smart Reef does not.

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

Smart Reef ships an update every 3 months, and D every 2 weeks. Most recently, Smart Reef was updated on October 24, 2026 and D on October 25, 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.*