ReadMaster vs 積DROP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ReadMaster
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■ 読書習慣 & 書籍 の管理に ReadMaster ■ For building better reading habits and managing your books — ReadMaster. 休日の朝、通勤のスキマ、就寝前のひととき___ いつでもワンタップで読書の世界へ。 毎日の読書習慣を支える、読書記録&タイマーアプリ。 Start reading anytime — in the morning, during your commute, or before bed. ReadMaster helps you build a daily reading habit with a simple reading timer and book tracker. ◯ 思い立ったらすぐに起動、読書タイマー Start reading instantly with one tap. アプリを開いてワンタップ、気が向いた瞬間にすぐ読書を始められます。 もちろん、集中力を妨げる広告などは一切ナシ。 Open the app and start your reading session with a single tap — no ads, no distractions, just reading. ◯ 自分だけの本棚で書籍を管理 Organize your personal bookshelf. 気になる本は、すぐ「本棚」へ登録! 登録した本は自由自在に管理され、コメントや評価、読了日をいつでも振り返ることができます。 Add your favorite books to your personal shelf. Track your progress, add notes and ratings, and revisit your reading history anytime. ◯ 読書時間を自動で集計 Automatically track your reading time. あなたの読書習慣をデータとして可視化。 面倒な手入力は一切不要!タイマーをスタートするだけで、読書時間が自動で記録されます。 Your reading habits are visualized through clean, automatic tracking. No manual input needed — just start the timer and your sessions are recorded automatically. ◯ 美しいデザインと癒しの音楽 Beautiful design and relaxing music. 洗練されたUIとヒーリングBGMが、あなたに最高の読書時間を提供します。 もちろん、完全な静寂での読書を楽しみたい人もサポートします。 Enjoy a calm, focused reading experience with elegant design and soothing background music. Or simply read in silence — the choice is yours. ■ 毎日の読書は、日常に小さな彩りを与えます そしてこのアプリは、未知なる本の世界へ旅立つあなたのよきパートナーとなるでしょう ■ Reading adds color to your everyday life. Let ReadMaster be your companion on your journey into the world of books. 利用規約 (Terms of Use) https://temma040302.github.io/privacy-policy/terms_of_use.html プライバシーポリシー (Privacy Policy) https://temma040302.github.io/privacy-policy/privacy_policy.html サポートページ (Support Page) https://temma040302.github.io/privacy-policy/support.html
積DROP
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Got a stack of books you bought but haven't read? Same. TsunDrop is a reading app that stacks every book you buy into a physical tower — powered by a real 2D physics engine. You don't have to read them. Just stack. That's the whole point. — Just stack. That's it. — Every time you add a book, it falls from the top and lands on your tower, sized by its format (bunko, shinsho, hardback, A5). The physics engine makes every stack a little different. Same book, different lean. Reading apps love to make you feel guilty. TsunDrop doesn't. Buying books — even ones you'll never get to — is a perfectly valid hobby. We're here to celebrate it. — Who it's for — - People who buy books faster than they can read them - Anyone who hears "your tsundoku is too big" and thinks "let it grow" - Readers who want to see their pile, not just a number on a screen - Folks burned out by every other reading tracker — Inside — ▸ Stack (the main thing) Scan a barcode or type a 13-digit ISBN. TsunDrop pulls bibliographic data from openBD and Japan's NDL Search. Manual entry works too. Books fall in, get stacked, lean against each other. Add more and the pile grows taller, genre colors mixing into a mosaic. Whether that's "too many" or "looking great" is entirely your call — set the overflow warning to "none" and stack as much as you want. ▸ Height Rank The total spine width of every book — read or unread — is measured against a real-world scale. An apple → a milk carton → a ruler → a cat → a guitar → an adult → a phone booth → a giraffe → a house → a big tree → Tokyo Tower → Mt. Fuji → Everest. Buy and stack: rank goes up. Read: rank goes up. Both count, equally. ▸ Read one when you feel like it Tap a book, hit "Finish & shelve." It moves to your Finished Shelf, sortable by date, title, or color. The books resting on top tumble down in physics. That moment is satisfying — but it's a side dish, not the main course. ▸ Numbers Tower view: unread count / pages left / pages read Shelf view: total pages read / books finished / shelf width (cm) Pages stack up like XP. Set a monthly goal if you want. Skip it if you don't. ▸ Share Export your tower as a 1080×1080 image and post it. "Yeah, I haven't read most of these." — Details — - Genre colors (literature, history, philosophy, tech, business, other) - 3 text sizes, 4 themes (Green, Ink, Navy, Grape) - Haptic feedback - Notes on every book (up to 2000 characters) - Export and import for backup — Privacy — All your book data stays on your device. No account required. TsunDrop only contacts openBD and NDL Search for bibliographic lookups. Nothing else leaves your phone. The camera is used solely to scan ISBN barcodes. — You might be here because — Your shelf is overflowing. You buy too many e-books and forgot what you have. You want a break from "you really should read more." If so: just stack. Read when you feel like it. Stack first. Read later (if ever). Bibliographic data: openBD / NDL Search Licenses: Matter.js (MIT) / Noto Serif JP, Noto Sans JP (SIL OFL 1.1)
Screenshots
Verdict
The clearest difference is update cadence: 積DROP at every 9 days against ReadMaster's every 2 months. 積DROP also leads on device support (3 vs 1) and iOS requirement (15.5 vs 18.5). 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
Both are free to download. ReadMaster sells 2 in-app purchases, starting at $0.99 per month and 積DROP sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
ReadMaster ships an update every 2 months, 積DROP every 9 days. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.
| Parameter | ReadMaster | 積DROP |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 15.5 — better |
| Further details — not scored | ||
| Size | 95 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | TEMMA SUZUKI | ForeGroove Inc. |
In-app purchases
ReadMaster
- ReadMaster Plus 1ヶ月$0.991 Month
- ReadMaster Plus 6ヶ月$5.996 Months
積DROP
- A Small Coffee$0.49
- A Light Meal$2.99
- A Lunch$5.99
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- A Dinner Treat$11.99







