Comparison

QuakeJP vs 河川カメラ

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

Head to head
About

QuakeJP

Visualize earthquake data for Japan with detailed historical records and a color-coded map. Explore recent and major seismic events, with information available for quakes of magnitude 5.0 and above.

Highlights
  • Latest earthquake display
  • Historical major earthquake data (1900-)
  • Two-year big quake records (M5.0+)
  • Color-coded pins by magnitude
  • Detailed earthquake information on tap
  • Map zoom and pan functionality
Features
Read full description

This application displays earthquakes in Japan very graphically. Main Features *Latest Quakes : display latest about 20 earthquakes in Japan *Big Quakes in 2-year : display earthquakes in magnitude 5.0 or more for two years in Japan *Big Quakes (1900-) : display major earthquakes since 1900 in Japan How To *Each pin corresponds to an earth quake. Each pin classifies according to the scale of the earthquake. -Over M7.0 : red color pin -Over M6.0 : purple color pin -Under M6.0 : green color pin *When each pin is tapped, details of the corresponding earth quake are displayed in the under box. When a detail information is selected, the corresponding pin is displayed in the center of your screen. *The reduced scale changes by Pinch In (Pinch Out) over the map. Application Consideartion *This application can't display earthquakes in real time. *This application uses the information of earthquakes from Japan Weather Association. *This application can display the earthquake about 20 min. after the announcement. *This application doesn't display the earthquake which detail is unknown. *This application displays the depth of a shallow earthquake as 0km. *When the earthquakes happened in the same place, each hypocenter information is displayed by tapping the same pin. *The information about major earthquakes is referring to the book(science chronology) and the information on Wikipedia.

About

河川カメラ

Features
Read full description

【概要】 全国の河川情報!! 近年、日本の年平均気温は上昇しています。また、猛烈な雨(1時間降水量80mm以上の雨)の年間発生回数も増加しています。 地球温暖化の進行に伴い、大雨や短時間などの頻度はさらに増加すると予測されている中で、本アプリが活用出来れば良いとおもい作成しました。 都道府県の河川に設置されているカメラの静止画をリアルタイムでお届けしています。 自動更新や手動での更新も可能です。 是非ご活用ください。 【主な機能】 ・全国の河川情報 ・お気に入り 【本アプリケーションについて】 ○ 対応機種 : iOS 11.0〜 今後もご要望にお答えしていきたいと思いますので、 ご要望などあれば、どんどんお知らせください!

Screenshots

QuakeJP3 screens
河川カメラ4 screens

Verdict

The call

The clearest difference is rating: 河川カメラ at 5.0 against QuakeJP's 2.3. 河川カメラ also leads on update cadence (monthly vs every 6 months). QuakeJP's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price 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. 河川カメラ sells 4 one-off in-app purchases. QuakeJP asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

河川カメラ holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews complicate that: 32% of QuakeJP's written reviews are positive against 15% of 河川カメラ's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

QuakeJP ships an update every 6 months, 河川カメラ monthly. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

Scorecard7 real differences · 3 level
QuakeJP versus 河川カメラ: the parameters behind the verdict, then further details
ParameterQuakeJP河川カメラ
PriceFreeFree
Rating2.3 (3 ratings)5.0 (1 ratings) — better
Positive reviews32.3% of reviews — better15.0% of reviews
Number of ratings3 — better1
Update frequencyEvery 6 monthsMonthly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.6
Further details — not scored
Size1 MB73 MB
Age rating4+4+
Developerdoublekhidehiko aihara

Customer experience

QuakeJP

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews31 reviews
Positive32.3%
Neutral19.4%
Negative48.4%

河川カメラ

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews20 reviews
Positive15.0%
Neutral10.0%
Negative75.0%

In-app purchases

None

QuakeJP

No in-app purchases

4 purchases

河川カメラ

One-time4
  • Coffee (Regular)$0.49
  • 開発者応援募金$1.99
  • Coffee (Large)$1.99
Show 1 more
  • Cake Set$5.99

Questions

Is QuakeJP free?
QuakeJP is free to download, with no in-app purchases.
Is 河川カメラ free?
河川カメラ is free to download, with in-app purchases available.
Which has better reviews, QuakeJP or 河川カメラ?
河川カメラ is rated higher. QuakeJP averages 2.3 out of 5 from 3 ratings, while 河川カメラ averages 5.0 from 1 ratings.
Do QuakeJP or 河川カメラ have ads?
河川カメラ shows ads; QuakeJP does not.
Which is updated more often, QuakeJP or 河川カメラ?
QuakeJP ships an update every 6 months, and 河川カメラ monthly. Most recently, QuakeJP was updated on November 6, 2026 and 河川カメラ on November 11, 2026.

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