# 潮汐 vs 海天気.jp

The clearest difference is in-app purchases: 海天気.jp at none against 潮汐's 4. 海天気.jp also leads on iOS requirement (13.0 vs 15.6). 潮汐's advantage is review sentiment (100% vs 85%) and update cadence (every 6 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. 潮汐 sells 4 one-off in-app purchases. 海天気.jp asks for nothing beyond the download.

潮汐 ships an update every 6 weeks, 海天気.jp every 4 months. The most recent releases landed on September 13, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | 潮汐 | 海天気.jp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tide/id1600592667/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 85.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 58 MB | 37 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [hidehiko aihara](https://appshunter.io/developer/1178520609) | [Risesystem, inc.](https://appshunter.io/developer/427437064) |

## What reviewers say

### 潮汐

[App page](https://appshunter.io/ios/app/tide/id1600592667)

Access real-time tide and tidal level information across the country. View detailed tide graphs, moon phases, and up to three days of weather forecasts. This app provides quick access to high and low tide data.

**Highlights:** Tide information, Tidal level data, Tide graphs, Moon phase information, 3-day weather forecast

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee (Regular) | $0.49 | one-time |
| 開発者応援募金 | $1.99 | one-time |
| Coffee (Large) | $1.99 | one-time |
| Cake Set | $5.99 | one-time |


### 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


## Frequently asked questions

### Is 潮汐 free?

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

### Is 海天気.jp free?

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

### Do 潮汐 or 海天気.jp have ads?

Both 潮汐 and 海天気.jp show ads.

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

潮汐 ships an update every 6 weeks, and 海天気.jp every 4 months. Most recently, 潮汐 was updated on September 13, 2026 and 海天気.jp 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.*