国土マップR vs 流域 / Ryuiki
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
国土マップR
Access over 160 types of maps from the Geospatial Information Authority of Japan, including topographic maps, aerial photos, and disaster maps. Overlay up to three maps with adjustable transparency and view legends with a single tap. Offline caching allows for use in remote areas or airplane mode.
- Display 160+ types of Japanese maps
- Overlay up to 3 maps
- Adjustable map transparency
- One-tap legend display
- Automatic offline caching (up to 200MB)
- Simple GPS for current location
- View elevation of screen center
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This app lets you display various maps provided by the Geospatial Information Authority of Japan. It can be used within Japan. You can display a wide range of maps, including standard topographic maps, nationwide aerial photographs, residential land use survey maps, aerial photographs taken during disasters, volcano base maps, lake maps, and more — over 160 types in total! You can display three map layers at once: an overlay map, a base map, and Google Maps. The transparency of the overlay map and base map can be adjusted freely. For maps that have legends, you can display the legend with a single tap. Maps displayed on the screen are automatically cached up to 200 MB (*), so they can also be used deep in the mountains where there is no mobile signal, or in airplane mode. The app can also be used as a simple GPS app for hiking. It includes only the minimum GPS features needed to show your current location, making it easy for anyone to use. You can easily check the elevation at the center of the screen. Please use this feature for disaster preparedness and other purposes. * When the cache exceeds the limit, older cached data is automatically deleted when the app starts. You do not need to worry about the app consuming all of your smartphone storage. ■ Notes ・Use of this app is at your own risk. ・We assume no responsibility for the accuracy, safety, or reliability of the information provided. ・Please do not contact the Geospatial Information Authority of Japan regarding this app. Maps: Geospatial Information Authority of Japan [http://www.gsi.go.jp/](http://www.gsi.go.jp/)
流域 / Ryuiki
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いま自分が立っている場所を、流域という視点から感じ直す。 足元の地形、水の流れ、山脈が形づくる境界。アプリを開くと現在地の地形が現れ、河川と流域の輪郭が浮かび上がり、自分がどの流域に属しているかを直感的に理解できます。 ■ 機能 ・GPSによる流域の自動判定 ・約26,000本の河川ネットワークを段階的に表示 ・3D地形による立体的な地図表現 ・タップで河川名を確認 ・地形図と衛星写真の切り替え ・流域を越えると情報が自動で切り替わり ■ 対応エリア 北海道の全13一級水系 天塩川、石狩川、十勝川、釧路川、網走川、常呂川、湧別川、渚滑川、留萌川、鵡川、沙流川、尻別川、後志利別川 ■ 使い方 アプリを開くと、現在地の地形と河川が現れます。ピンチアウトで視野を広げると、流域全体の水脈が姿を現します。車や電車で移動し、流域の境界を越える瞬間を体験してください。 壮大な思想を、日常の小さな行為に接続する装置。 ■ データ出典 河川・流域データ：国土数値情報（国土交通省）
Screenshots
Verdict
The clearest difference is update cadence: 流域 / Ryuiki at every 2 days against 国土マップR's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
国土マップR ships an update every 3 weeks, 流域 / Ryuiki every 2 days. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.
| Parameter | 国土マップR | 流域 / Ryuiki |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 53.8% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 25 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | keiji matsumoto | KENTA TORIMOTO |
In-app purchases
国土マップR
No in-app purchases
流域 / Ryuiki
No in-app purchases
