積DROP vs ブックタワー
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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)
ブックタワー
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読み終えた本が、喫茶店の机の上に積み上がっていきます。 太さは、その本のページ数のぶんだけ。冊数ではなく「高さ」で、読んだ量が見えるアプリです。 積んだ高さは、1円玉から松本城の天守まで、46の身近な物とくらべられます。 高さがのびると、小さななかまが1体ずつ目をさまします。 さいしょの1体は、文庫1冊ぶんの高さで。 【できること】 ・本の登録: タイトルで探して2タップ。手入力でも登録できます ・積みタワー: 読み終えた本が、ページ数ぶんの太さで積み上がります。2本の指でひろげると、うすい本の題名も読めます ・身近な物とくらべる: 塔が越えた物を、同じ縮尺で並べて見せます。越えた瞬間には、どれだけ高くなったかも出ます ・みちのり: その年に越えた物と、越えた日・何冊目かが残ります。12月と1月は1年ぶんを1枚の画像にできます ・なかま図鑑: 積んだ高さで、8体のなかまが順番に目をさまします ・本棚: 読んだ本の表紙が、月ごとの木の棚にならびます ・読みグセのグラフ: 月ごとの冊数、気分、読む速さの内訳が見えます ・ブクログからの取り込み: これまでの記録をCSVでまとめて積めます ・共有: タワーの画像を書き出せます。越えた物と並べた画像にもできます。本の題名を見せるかどうかは選べます 【高さについて】 ・高さはページ数から計算した、おおよその目安です。実物の厚みとは少しちがいます ・ページ数は書誌データベースから自動で入ります。手で直すこともできます 【データについて】 ・記録はすべて端末の中だけに保存されます。アカウント登録は不要です ・本の検索と取り込みのときだけ、検索語と本の ISBN が送られます。最初に一度だけ聞く「このアプリをどこで知ったか」の答えも送られます(くわしくはプライバシーポリシー) 【こんな人に】 ・「今年は何冊」より「今年はこれだけ読んだ」を目で見たい ・電子書籍や図書館の本ばかりで、読んだ痕跡が手元に残らない ・静かに、ひとりで、積み上がっていくのを眺めたい 【リンク】 ・プライバシーポリシー: https://yomidana.vercel.app/privacy/ ・利用規約: https://yomidana.vercel.app/terms/
Screenshots
Verdict
The clearest difference is in-app purchases: ブックタワー at none against 積DROP's 4. On price, update cadence, ads 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. 積DROP sells 4 one-off in-app purchases. ブックタワー asks for nothing beyond the download.
積DROP ships an update every 9 days, ブックタワー every 10 days. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.
| Parameter | 積DROP | ブックタワー |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days — better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 57 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | ForeGroove Inc. | Sota Hidaka |
In-app purchases
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
ブックタワー
No in-app purchases









