# ダムナビ 日本全国ダム要覧 vs Manhole Card Map

The clearest difference is ads: ダムナビ 日本全国ダム要覧 at none against Manhole Card Map's shown. ダムナビ 日本全国ダム要覧 also leads on iOS requirement (8.0 vs 17.0). Manhole Card Map's advantage is update cadence (weekly vs every 23 months). 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.

ダムナビ 日本全国ダム要覧 ships an update every 23 months, Manhole Card Map weekly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ダムナビ 日本全国ダム要覧 | Manhole Card Map |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 23 months | **Weekly** |
| Monetization | Free | — |
| Size | 36 MB | 141 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mejiro Publications](https://appshunter.io/developer/384877298) | [TETSUNOSUKE HIDA](https://appshunter.io/developer/6773281087) |

## 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 Card Map

[App page](https://appshunter.io/ios/app/manhole-card-map/id6773281085)

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

**In-app purchases:** none


## 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 Card Map free?

Manhole Card Map is free to download, with no in-app purchases.

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

Manhole Card Map shows ads; ダムナビ 日本全国ダム要覧 does not.

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

ダムナビ 日本全国ダム要覧 ships an update every 23 months, and Manhole Card Map weekly. Most recently, ダムナビ 日本全国ダム要覧 was updated on November 1, 2026 and Manhole Card Map on October 31, 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.*