# TidalWatch vs FishDays

The clearest difference is review sentiment: FishDays at 100% against TidalWatch's 0%. FishDays also leads on in-app purchases (none vs 20). TidalWatch's advantage is iOS requirement (9.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. TidalWatch sells 20 in-app purchases, starting at $0.99 per year. FishDays asks for nothing beyond the download.

TidalWatch ships an update every 3 weeks, FishDays monthly. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TidalWatch | FishDays |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 53 MB | 42 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shinichi HISAMATSU](https://appshunter.io/developer/398895004) | [zukan.com](https://appshunter.io/developer/791100929) |

## What reviewers say

### TidalWatch

[App page](https://appshunter.io/ios/app/tidalwatch/id1092875095)

This app provides tide charts and barometric pressure forecasts for over 300 locations in Japan. Quickly check tide times and conditions directly on your Apple Watch, ideal for fishing, surfing, or shellfish gathering without needing your iPhone.

**Highlights:** Apple Watch tide charts, Barometric pressure forecasts, Over 300 Japanese locations, Tide and high/low tide times, Quick access on Apple Watch

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (20)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 福島県 年間ライセンス | $0.99 | per year |
| 千葉県 年間ライセンス | $0.99 | per year |
| 福岡県 年間ライセンス | $0.99 | per year |
| 佐賀県 年間ライセンス | $0.99 | per year |
| 長崎県 年間ライセンス | $0.99 | per year |
| 熊本県 年間ライセンス | $0.99 | per year |
| 大分県 年間ライセンス | $0.99 | per year |
| 宮崎県 年間ライセンス | $0.99 | per year |
| 鹿児島県 年間ライセンス | $0.99 | per year |
| 沖縄県 年間ライセンス | $0.99 | per year |
| 年間ライセンス 北海道 | $0.99 | per year |
| 北海道地方 年間ライセンス | $1.99 | per year |
| 北海道・東北地方 年間ライセンス | $1.99 | per year |
| 関東・信越地方 年間ライセンス | $1.99 | per year |
| 北陸・東海地方 年間ライセンス | $1.99 | per year |
| 近畿地方 年間ライセンス | $1.99 | per year |
| 四国地方 年間ライセンス | $1.99 | per year |
| 中国地方 年間ライセンス | $1.99 | per year |
| 九州・沖縄地方 年間ライセンス | $1.99 | per year |
| 年間ライセンス 全国 | $4.99 | per year |


### FishDays

[App page](https://appshunter.io/ios/app/fishdays/id1610672069)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is TidalWatch free?

TidalWatch is free to download, with in-app purchases available.

### Is FishDays free?

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

### Do TidalWatch or FishDays have ads?

Neither TidalWatch nor FishDays shows ads.

### Which is updated more often, TidalWatch or FishDays?

TidalWatch ships an update every 3 weeks, and FishDays monthly. Most recently, TidalWatch was updated on October 12, 2026 and FishDays on October 24, 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.*