# 海天気.jp vs 潮時計

The clearest difference is ads: 潮時計 at none against 海天気.jp's shown. 潮時計 also leads on update cadence (weekly vs every 4 months). 海天気.jp's advantage is iOS requirement (13.0 vs 15.0). On price, 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.

海天気.jp ships an update every 4 months, 潮時計 weekly. The most recent releases landed on September 10, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | 海天気.jp | 潮時計 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 85.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Ad-supported | — |
| Size | 37 MB | 69 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Risesystem, inc.](https://appshunter.io/developer/427437064) | [Tsuyoshi Yokoyama](https://appshunter.io/developer/6794326203) |

## What reviewers say

### 海天気.jp

[App page](https://appshunter.io/ios/app/jp/id1641843175)

Get detailed, hourly weather forecasts for over 8,000 marine spots, including wind, temperature, and wave height. Visualize precipitation with clear icons and access 14-day outlooks for planning. Also provides city-level forecasts and rain cloud movement.

**Highlights:** Hourly forecasts for 8,000+ marine spots, Up to 84-hour pinpoint weather predictions, 14-day weather outlooks, Rain cloud and lightning movement visualization, Tide graphs and sea temperature maps, City-level weather forecasts, Favorite spot bookmarking

**In-app purchases:** none


### 潮時計

[App page](https://appshunter.io/ios/app/id6794326201)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 海天気.jp free?

海天気.jp is free to download, with no in-app purchases.

### Is 潮時計 free?

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

### Do 海天気.jp or 潮時計 have ads?

海天気.jp shows ads; 潮時計 does not.

### Which is updated more often, 海天気.jp or 潮時計?

海天気.jp ships an update every 4 months, and 潮時計 weekly. Most recently, 海天気.jp was updated on September 10, 2026 and 潮時計 on September 12, 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.*