# 平面直角座標 vs Aisea

The clearest difference is review sentiment: 平面直角座標 at 86% against Aisea's 14%. 平面直角座標 also leads on iOS requirement (10.0 vs 15.6). Aisea's advantage is update cadence (every 5 weeks vs every 14 months). On price, ads, 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.

平面直角座標 ships an update every 14 months, Aisea every 5 weeks. Both last shipped on October 15, 2026.

## The numbers

| Metric | 平面直角座標 | Aisea |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **85.7% of reviews** | 14.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 4 MB | 86 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [keiji matsumoto](https://appshunter.io/developer/354143756) | [Aidea Inc.](https://appshunter.io/developer/1454632788) |

## What reviewers say

### 平面直角座標

[App page](https://appshunter.io/ios/app/id853019561)

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

**In-app purchases:** none


### Aisea

[App page](https://appshunter.io/ios/app/aisea-sailing-support-app/id1454632789)

This navigation app enhances maritime safety by displaying nearby vessel movements and potential collision risks. It also allows users to report hazards, review past voyages, and manage fleets. Communicate with nearby users directly through the app.

**Highlights:** AIS vessel tracking and collision alerts, Map editor for reporting hazards, Voyage playback and analysis, Fleet management tools, In-app Push-To-Talk communication

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 平面直角座標 free?

平面直角座標 is free to download, with no in-app purchases.

### Is Aisea free?

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

### Do 平面直角座標 or Aisea have ads?

Neither 平面直角座標 nor Aisea shows ads.

### Which is updated more often, 平面直角座標 or Aisea?

平面直角座標 ships an update every 14 months, and Aisea every 5 weeks. Most recently, 平面直角座標 was updated on October 15, 2026 and Aisea on October 15, 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.*