# ダムナビ 日本全国ダム要覧 vs Manhole Notebook

The clearest difference is in-app purchases: ダムナビ 日本全国ダム要覧 at none against Manhole Notebook's 1. ダムナビ 日本全国ダム要覧 also leads on iOS requirement (8.0 vs 17.0). Manhole Notebook's advantage is update cadence (weekly vs every 23 months). On price, ads and device support there is nothing between them.

Both are free to download. Manhole Notebook sells 1 in-app purchase, starting at $14.99 per year. ダムナビ 日本全国ダム要覧 asks for nothing beyond the download.

ダムナビ 日本全国ダム要覧 ships an update every 23 months, Manhole Notebook weekly. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ダムナビ 日本全国ダム要覧 | Manhole Notebook |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Weekly** |
| Monetization | Free | — |
| Size | 36 MB | 15 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mejiro Publications](https://appshunter.io/developer/384877298) | [Gabriel Barandiaran Silveira](https://appshunter.io/developer/1867230690) |

## What reviewers say

### ダムナビ 日本全国ダム要覧

[App page](https://appshunter.io/ios/app/id708986267)

Discover approximately 3,000 dams across Japan with detailed information on their water systems, rivers, types, and capacities. Features include sorting, map display, and navigation to nearby dams, perfect for road trips and sightseeing.

**Highlights:** Detailed dam information, Sortable dam data, Map display of all dams, Search for nearby dams, Navigation to dams, Dam card distribution info

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

**In-app purchases:** none


### Manhole Notebook

[App page](https://appshunter.io/ios/app/manhole-notebook/id6759797202)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Yearly | $14.99 | per year |


## Frequently asked questions

### Is ダムナビ 日本全国ダム要覧 free?

ダムナビ 日本全国ダム要覧 is free to download, with no in-app purchases.

### Is Manhole Notebook free?

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

### Do ダムナビ 日本全国ダム要覧 or Manhole Notebook have ads?

Neither ダムナビ 日本全国ダム要覧 nor Manhole Notebook shows ads.

### Which is updated more often, ダムナビ 日本全国ダム要覧 or Manhole Notebook?

ダムナビ 日本全国ダム要覧 ships an update every 23 months, and Manhole Notebook weekly. Most recently, ダムナビ 日本全国ダム要覧 was updated on October 7, 2026 and Manhole Notebook on October 8, 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.*