# GDFF vs FishYZMEi

The clearest difference is iOS requirement: GDFF at 10.0 against FishYZMEi's 15.6. 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.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | GDFF | FishYZMEi |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 41 MB | 36 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [松林 赵](https://appshunter.io/developer/596658260) | [Shenzhen Yuezhimei Technology Co., Ltd](https://appshunter.io/developer/1777752381) |

## What reviewers say

### GDFF

[App page](https://appshunter.io/ios/app/gdff/id1468415725)

This professional-grade sonar device connects to your smartphone to provide real-time underwater data. It maps depth, temperature, terrain, and fish density up to 500 meters away and 40 meters deep.

**Highlights:** Real-time sonar technology, Underwater mapping (depth, temp, terrain), Fish density and size detection, 500m signal range, 40m maximum depth, Adjustable gain and multiple modes

**Features:** macOS Compatibility

**In-app purchases:** none


### FishYZMEi

[App page](https://appshunter.io/ios/app/fishyzmei/id6737753665)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GDFF free?

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

### Is FishYZMEi free?

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

### Do GDFF or FishYZMEi have ads?

Neither GDFF nor FishYZMEi shows ads.

### Which is updated more often, GDFF or FishYZMEi?

GDFF ships an update every 3 weeks, and FishYZMEi every 3 weeks. Most recently, GDFF was updated on October 7, 2026 and FishYZMEi 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.*