# ダムナビ 日本全国ダム要覧 vs DamApp

The clearest difference is update cadence: DamApp at every 2 months against ダムナビ 日本全国ダム要覧's every 23 months. DamApp also leads on review sentiment (86% vs 63%). ダムナビ 日本全国ダム要覧's advantage is iOS requirement (8.0 vs 17.0). On price, ads, in-app purchases and monetization model 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, DamApp every 2 months. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ダムナビ 日本全国ダム要覧 | DamApp |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 62.5% of reviews | **85.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 36 MB | 228 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Mejiro Publications](https://appshunter.io/developer/384877298) | [Yuta Kokubo](https://appshunter.io/developer/1549449778) |

## 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


### DamApp

[App page](https://appshunter.io/ios/app/damapp/id1549449776)

Discover over 2,000 dams across Japan. Search by name, distance, prefecture, type, or purpose. Record check-ins, dam card ownership, and add favorites or notes. All dam information is available offline.

**Highlights:** Search over 2,000 dams nationwide, Filter by distance, prefecture, type, purpose, Offline access to dam details, Record check-ins and dam card ownership, Map view with MAPCODE support, Import visit records from text files

**Features:** 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 DamApp free?

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

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

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

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

ダムナビ 日本全国ダム要覧 ships an update every 23 months, and DamApp every 2 months. Most recently, ダムナビ 日本全国ダム要覧 was updated on October 7, 2026 and DamApp on October 10, 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.*