# ダムナビ 日本全国ダム要覧 vs Dam Card Map

The clearest difference is ads: ダムナビ 日本全国ダム要覧 at none against Dam 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). Dam Card Map's advantage is update cadence (every 5 days 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, Dam Card Map every 5 days. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ダムナビ 日本全国ダム要覧 | Dam Card Map |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 23 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 36 MB | 31 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


### Dam Card Map

[App page](https://appshunter.io/ios/app/dam-card-map/id6811755927)

**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 Dam Card Map free?

Dam 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 Dam Card Map have ads?

Dam 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 Dam Card Map?

ダムナビ 日本全国ダム要覧 ships an update every 23 months, and Dam Card Map every 5 days. Most recently, ダムナビ 日本全国ダム要覧 was updated on October 7, 2026 and Dam Card Map on October 24, 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.*