Honyomu vs 積DROP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Honyomu
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Remember what you’ve read. Keep what you want to read next in one personal bookshelf. Honyomu is a simple reading tracker and bookshelf app for iPhone, designed to help you keep a record of the books that become part of your life. Organize books you’ve finished, books you’re currently reading, and books you want to read. Search by title or ISBN, add covers, save notes, and gradually build your own digital bookshelf. When you wonder, “Have I read this before?” or “Do I already own this book?”, your library is always close at hand. Key features: • Track books you’ve read, are reading, or want to read • Search for books by title or ISBN • Display book covers on your personal bookshelf • Keep reading notes and book information together • Organize books by genre • Look back on your reading history • Select 1–5 books and create a beautifully designed reading card to share Whether you read constantly or only pick up a book now and then, Honyomu gives your reading history a place to grow. Printed books or ebooks, every book you discover can become part of your personal collection. More than a reading log, Honyomu is a bookshelf you’ll want to come back and look at. For readers looking for a reading tracker, book log, personal library, bookshelf, book organizer, or reading journal, Honyomu keeps everything together in one simple place. Make your reading history your own. Support https://sakumori.com/app_support/honyomu/ Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy https://sakumori.com/privacypolicy/app-privacy/honyomu/
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 in-app purchases: Honyomu at none against 積DROP's 4. Honyomu also leads on update cadence (every 3 days vs every 9 days). 積DROP's advantage is iOS requirement (15.5 vs 17.0). On price, 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. Honyomu asks for nothing beyond the download.
Honyomu ships an update every 3 days, 積DROP every 9 days. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.
| Parameter | Honyomu | 積DROP |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days — better | Every 9 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 17.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 18 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Daisaku Mori | ForeGroove Inc. |
In-app purchases
Honyomu
No 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









