# GDFF vs IceFish BT

The clearest difference is update cadence: GDFF at every 3 weeks against IceFish BT's every 26 months. On price, ads, in-app purchases and device support there is nothing between them.

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

GDFF ships an update every 3 weeks, IceFish BT every 26 months. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | GDFF | IceFish BT |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 26 months |
| Monetization | Free | — |
| Size | 41 MB | 36 MB |
| Requires iOS | 10.0 | 10.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [松林 赵](https://appshunter.io/developer/596658260) | [定敢 刘](https://appshunter.io/developer/1194376703) |

## 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


### IceFish BT

[App page](https://appshunter.io/ios/app/icefish-bt/id1586251830)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GDFF free?

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

### Is IceFish BT free?

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

### Do GDFF or IceFish BT have ads?

Neither GDFF nor IceFish BT shows ads.

### Which is updated more often, GDFF or IceFish BT?

GDFF ships an update every 3 weeks, and IceFish BT every 26 months. Most recently, GDFF was updated on October 7, 2026 and IceFish BT on October 1, 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.*