Comparison

Sapporo’s Disaster Management vs 流域 / Ryuiki

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sapporo’s Disaster Management

This app provides crucial disaster information for residents and tourists in Sapporo. It offers details on earthquakes, typhoons, floods, evacuation sites, and weather warnings to help users prepare and respond effectively to emergencies.

Highlights
  • Disaster awareness and preparedness
  • City-wide hazard information
  • Evacuation site locations
  • Weather warnings
  • Information for residents and tourists
Features
Read full description

Sapporo’s Disaster Management App (nicknamed Sonae) is a smartphone application designed to raise awareness of earthquake disasters and wind and flood damage both among local residents as well as tourists visiting the city so that everyone can prepare for and act in response to disasters. The number of typhoons approaching Hokkaido has recently increased due to abnormal weather phenomena (e.g., El Niño) and other reasons. Sapporo’s Disaster Management App (Sonae) allows users to easily and quickly obtain useful information both under normal circumstances and in times of disasters. It provides information on various types of disasters, city-wide hazard information by type of disaster, evacuation site information, evacuation recommendations, and weather warnings. This App, which is designed for self-help, public help, and mutual help, can be used by many local residents as well as tourists visiting Sapporo as a disaster management guide that can help to ensure everyone’s safety and security in Sapporo.

About

流域 / Ryuiki

Features
Read full description

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

Sapporo’s Disaster Management4 screens
流域 / Ryuiki4 screens

Verdict

The call

The clearest difference is update cadence: 流域 / Ryuiki at every 2 days against Sapporo’s Disaster Management's every 2 months. 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Sapporo’s Disaster Management ships an update every 2 months, 流域 / Ryuiki every 2 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 7 level
Sapporo’s Disaster Management versus 流域 / Ryuiki: the parameters behind the verdict, then further details
ParameterSapporo’s Disaster Management流域 / Ryuiki
PriceFreeFree
Positive reviews5.6% of reviews—
Update frequencyEvery 2 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size79 MB10 MB
Age rating4+4+
DeveloperCity of SapporoKENTA TORIMOTO

In-app purchases

None

Sapporo’s Disaster Management

No in-app purchases

None

流域 / Ryuiki

No in-app purchases

Questions

Is Sapporo’s Disaster Management free?
Sapporo’s Disaster Management is free to download, with no in-app purchases.
Is 流域 / Ryuiki free?
流域 / Ryuiki is free to download, with no in-app purchases.
Do Sapporo’s Disaster Management or 流域 / Ryuiki have ads?
Neither Sapporo’s Disaster Management nor 流域 / Ryuiki shows ads.
Which is updated more often, Sapporo’s Disaster Management or 流域 / Ryuiki?
Sapporo’s Disaster Management ships an update every 2 months, and 流域 / Ryuiki every 2 days. Most recently, Sapporo’s Disaster Management was updated on November 6, 2026 and 流域 / Ryuiki on October 31, 2026.

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