GDFF vs Erchang Fish
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GDFF
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.
- 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
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革钓WIFI智能探鱼器是一款专业级别的打窝船专用探鱼器，它利用最先进的声呐技术，可以实时监测船所航行位置的水深水温，地形地貌，鱼群密度和鱼群大小等信息并回传到手机上。信号有效距离达到500米，最大深度40米，100级增益调节，多种模式选择，不放过水下隐藏的每个细节，帮助广大钓友探索未知的水下世界。
Erchang Fish
This intelligent fish detector app offers a dual-band sonar system with a user-friendly interface. It's designed to be a helpful tool for fishing enthusiasts, providing convenient operation for better angling experiences.
- Dual band intelligent fish detection
- Friendly interface
- Convenient operation
- Fishing helper tool
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This is a dual band intelligent fish detector app with friendly interface and convenient operation. It is a good helper for fishing lovers.
Screenshots
Verdict
The clearest difference is review sentiment: Erchang Fish at 33% against GDFF's 0%. GDFF's advantage is update cadence (every 3 weeks vs every 7 months). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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, Erchang Fish every 7 months. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.
| Parameter | GDFF | Erchang Fish |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | 33.3% of reviews — better |
| Update frequency | Every 3 weeks — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 | 9.3 — better |
| Further details — not scored | ||
| Size | 41 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | 松林 赵 | 定敢 刘 |
Customer experience
GDFF
Erchang Fish
In-app purchases
GDFF
No in-app purchases
Erchang Fish
No in-app purchases
