Comparison

帝國圖書館 vs ReadTime

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

Head to head
About

帝國圖書館

Features
Read full description

帝國圖書館(帝国図書館):国立国会図書館デジタルコレクション(旧:近代デジタルライブラリー)閲覧アプリ 国立国会図書館デジタルコレクション(http://dl.ndl.go.jp/)では明治から昭和はじめにかけての図書・雑誌を閲覧することができます。便利なのですが、iPhone / iPad の画面では見にくいこと、オフラインでの閲覧がしづらいのが残念です。 ということで、国立国会図書館デジタルコレクションで「ログインなしで閲覧可能」となっている文書を快適に閲覧できるアプリを作りました。公開されている昔の本の多くには戦前の「帝國圖書館」の蔵書印が押されていますので、アプリ名・アイコンに使いました。 国立国会図書館デジタルコレクションでは本をそのままデジタル化しています。そのまま表示すると余白が大きすぎるので、ページの境界を自動認識して本文を拡大するようにしています。横画面では2ページを見開きで、縦画面では1ページずつ表示します。ダブルタップで見開き2ページを1ページずつ読んでいくことができます。ページ内の移動/ピンチでの拡大縮小、スワイプによるページ移動ができます。 本を閲覧しているあいだに数ページ先まで先読みして快適に読みすすめることができるようにしてあります。 全ページをダウンロードする機能をつけました。本棚>情報画面からダウンロードしてください。 本のページを保存/メール/ツイート/Facebook に投稿できます。

About

ReadTime

This app encourages reading by allowing users to earn timed access to other apps based on the time spent reading. It features a digital bookshelf, progress tracking, and helps reduce phone addiction by creating a tangible reward for reading.

Highlights
  • Track reading sessions with a timer
  • Earn coins for reading time
  • Trade coins for timed app access
  • Digital bookshelf and book tracker
  • Progress tracking and reading reports
  • Reduce phone addiction
Features
Read full description

Read first. Scroll after. ReadTime is a reading habit app that lets you trade the time you spend reading for timed access to the apps you choose. Turn the time that disappears into social feeds and videos into a reason to open the book you meant to read. Finish a reading timer to earn coins, then spend those coins to temporarily unlock blocked apps. READ TO EARN APP TIME • Track focused reading sessions with a timer • Earn coins from completed reading time • Trade coins for timed app access • Temporarily unlock the apps you choose when you start the redeemed time • Automatically lock them again when time runs out A BEAUTIFUL BOOKSHELF AND BOOK TRACKER • Add books by search, ISBN barcode, or manual entry • Organize books as Want to Read, Reading, or Finished • Track pages and reading progress • Save notes and memorable quotes for each book SEE YOUR READING HABIT GROW • View book covers on a reading calendar • Keep a daily reading streak • Review weekly and monthly reading-time reports • Check your reading at a glance with widgets • Save and share your reading calendar as an image READTIME IS FOR YOU IF YOU WANT TO • Reduce phone addiction and mindless social media use • Build a consistent daily reading habit • Keep books, sessions, pages, and notes in one place • Earn screen time instead of relying on willpower alone • Create a simple reason to focus ReadTime uses Apple's Screen Time technology. Screen Time authorization is required to use app blocking. An active paid auto-renewable subscription is required to use all ReadTime features. A free trial may be available depending on the selected plan. Pricing, duration, and renewal terms are displayed on the in-app purchase screen. Terms of Use: https://app.notion.com/p/39bd12352d5880f19f0af3aeee7eeafb Privacy Policy: https://app.notion.com/p/39bd12352d5880c7a643ff778c78e3ca Contact: https://forms.gle/vfJFj7VrS2EovxKF9

Screenshots

帝國圖書館4 screens
ReadTime4 screens

Verdict

The call

The clearest difference is review sentiment: 帝國圖書館 at 72% against ReadTime's 0%. 帝國圖書館 also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). ReadTime's advantage is update cadence (monthly vs every 7 months). On price, ads and in-app purchases 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

帝國圖書館 ships an update every 7 months, ReadTime monthly. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 4 level
帝國圖書館 versus ReadTime: the parameters behind the verdict, then further details
Parameter帝國圖書館ReadTime
PriceFreeFree
Positive reviews72.2% of reviews — better0.0% of reviews
Update frequencyEvery 7 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Subscription
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better17.0
Further details — not scored
Size11 MB22 MB
Age rating12+4+
DeveloperShin-ichi NishimuraRyosuke Hayashi

Customer experience

帝國圖書館

Written reviews18 reviews
Positive72.2%
Neutral11.1%
Negative16.7%

ReadTime

Written reviews4 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

In-app purchases

None

帝國圖書館

No in-app purchases

None

ReadTime

No in-app purchases

Questions

Is 帝國圖書館 free?
帝國圖書館 is free to download, with no in-app purchases.
Is ReadTime free?
ReadTime is free to download, with no in-app purchases.
Do 帝國圖書館 or ReadTime have ads?
Neither 帝國圖書館 nor ReadTime shows ads.
Which is updated more often, 帝國圖書館 or ReadTime?
帝國圖書館 ships an update every 7 months, and ReadTime monthly. Most recently, 帝國圖書館 was updated on November 1, 2026 and ReadTime on November 5, 2026.

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