# Joylog vs Erchang Fish

The clearest difference is review sentiment: Joylog at 100% against Erchang Fish's 33%. 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.

Joylog ships an update every 4 months, Erchang Fish every 7 months. The most recent releases landed on June 1, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Joylog | Erchang Fish |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (5 ratings)](https://appshunter.io/ios/app/joylog/id1457651013/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 14 MB | 68 MB |
| Requires iOS | 10.0 | **9.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Joylog Tech Co.,Ltd](https://appshunter.io/developer/1457651012) | [定敢 刘](https://appshunter.io/developer/1194376703) |

## What reviewers say

### Joylog

[App page](https://appshunter.io/ios/app/joylog/id1457651013)

This app uses a smart sonar system to detect fish location, size, and depth up to 40 meters underwater. It also provides real-time information on underwater topography, water depth, and temperature, displayed on your mobile device.

**Highlights:** High-precision miniature sonar system, Detects fish location, size, and depth, Underwater topographic map generation, Real-time water depth and temperature, Mobile app integration for live data

**Features:** macOS Compatibility

**In-app purchases:** none


### Erchang Fish

[App page](https://appshunter.io/ios/app/erchang-fish/id1605890664)

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.

**Highlights:** Dual band intelligent fish detection, Friendly interface, Convenient operation, Fishing helper tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Joylog free?

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

### Is Erchang Fish free?

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

### Do Joylog or Erchang Fish have ads?

Neither Joylog nor Erchang Fish shows ads.

### Which is updated more often, Joylog or Erchang Fish?

Joylog ships an update every 4 months, and Erchang Fish every 7 months. Most recently, Joylog was updated on June 1, 2026 and Erchang Fish on September 10, 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.*