# SmartAquar vs KZJ

The clearest difference is iOS requirement: KZJ at 12.4 against SmartAquar's 15.5. 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.

SmartAquar ships an update every 2 months, KZJ every 6 weeks. The most recent releases landed on July 21, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | SmartAquar | KZJ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (3 ratings)](https://appshunter.io/ios/app/smartaquar/id1603612596/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 69 MB | 65 MB |
| Requires iOS | 15.5 | **12.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Gizwits IoT Technology Co., Ltd.](https://appshunter.io/developer/1468450527) | [Zhongshan Kangzhijie Electrical Appliances Co., Ltd.](https://appshunter.io/developer/1798975427) |

## What reviewers say

### SmartAquar

[App page](https://appshunter.io/ios/app/smartaquar/id1603612596)

Remotely manage your aquarium's heating rod from any location. Supports controlling multiple devices simultaneously and allows for easy sharing with family members. Receive instant notifications about your tank's status.

**Highlights:** Remote heating rod control, Multi-device support, Automatic operation, Device sharing, Real-time condition alerts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### KZJ

[App page](https://appshunter.io/ios/app/kzj/id6742648445)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SmartAquar free?

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

### Is KZJ free?

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

### Do SmartAquar or KZJ have ads?

Neither SmartAquar nor KZJ shows ads.

### Which is updated more often, SmartAquar or KZJ?

SmartAquar ships an update every 2 months, and KZJ every 6 weeks. Most recently, SmartAquar was updated on July 21, 2026 and KZJ 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.*