# 潮汐 vs 潮位アラート

The clearest difference is in-app purchases: 潮位アラート at none against 潮汐's 4. 潮位アラート also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. 潮汐 sells 4 one-off in-app purchases. 潮位アラート asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 30, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 潮汐 | 潮位アラート |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 58 MB | 255 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [hidehiko aihara](https://appshunter.io/developer/1178520609) | [OSD LLC](https://appshunter.io/developer/542270544) |

## 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 |


### 潮位アラート

[App page](https://appshunter.io/ios/app/id6756205355)

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

**In-app purchases:** none


## Frequently asked questions

### Is 潮汐 free?

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

### Is 潮位アラート free?

潮位アラート is free to download, with no in-app purchases.

### Do 潮汐 or 潮位アラート have ads?

潮汐 shows ads; 潮位アラート does not.

### Which is updated more often, 潮汐 or 潮位アラート?

潮汐 ships an update every 6 weeks, and 潮位アラート every 6 weeks. Most recently, 潮汐 was updated on October 30, 2026 and 潮位アラート on October 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*