読書貯金|読んだ本が資産になる読書記録アプリ vs Lastgrain
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
読書貯金|読んだ本が資産になる読書記録アプリ
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Reading Passbook – A reading log app where the books you read turn into “savings.” What is Reading Passbook? When you log a book you borrowed from the library or read through an unlimited-reading service, the book’s retail price is added as “Reading Savings.” It turns your reading activity into a visible, motivating habit — great for children building reading routines and adults who want to track their reading in a fun way. Main Features ・Book Registration Scan barcodes to register books instantly Search by title to find books Add books manually when needed ・Reading Savings Track the price of books you read from libraries or unlimited services View savings in a clean passbook-style log See how much you “saved” by reading instead of buying ・Bookshelf View Manage all the books you’ve read in one place Display book covers in a visual bookshelf layout Rate each book and add notes to remember your impressions ・Profile Management Create separate bookshelves for each family member Perfect for households where parents track children’s reading ・Share Your Reading Share monthly reading reports as images Create stylish cards showing the book covers you’ve read Who is this app for? Parents who want to support their child’s reading habit People who frequently use libraries Users of unlimited-reading services such as Kindle Unlimited Anyone who wants a fun, motivating way to keep a reading log Reading becomes more enjoyable when you can see your progress and savings. Start your Reading Passbook today!
Lastgrain
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Lastgrain is a life timer that shows the time you have lived and the time you have left based on your birth date and expected lifespan. It quietly visualizes the passage of your life through an hourglass and numerical displays. This app does not make predictions. It is not intended for medical diagnosis or statistical life expectancy forecasting. It simply displays the passage of time in a visible form based on the values you enter. Main features - Display elapsed time and remaining time - Show overall progress as a life timer - Toggle seconds on / off - Support Light / Dark / System theme - Home Screen widget support - Store input data locally on your device Rather than pushing you with notifications or flashy effects, Lastgrain is designed to offer a quiet experience of observing time through an hourglass and numbers. It is not primarily for time management or productivity, but for gently reconnecting you with your sense of time. Please note - Displayed values are calculated based on your input and your device’s current time - This app does not provide medical or statistical predictions - If you find it emotionally overwhelming, please discontinue use
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Verdict
The clearest difference is in-app purchases: Lastgrain at none against 読書貯金|読んだ本が資産になる読書記録アプリ's 1. 読書貯金|読んだ本が資産になる読書記録アプリ's advantage is update cadence (every 6 days vs monthly) and device support (3 vs 1). On price and ads 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. 読書貯金|読んだ本が資産になる読書記録アプリ sells 1 one-off in-app purchase. Lastgrain asks for nothing beyond the download.
読書貯金|読んだ本が資産になる読書記録アプリ ships an update every 6 days, Lastgrain monthly. The most recent releases landed on August 22, 2026 and August 31, 2026 respectively.
| Parameter | 読書貯金|読んだ本が資産になる読書記録アプリ | Lastgrain |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 days — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 36 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Miyuki Fujirai | Takafumi Kawano |
In-app purchases
読書貯金|読んだ本が資産になる読書記録アプリ
- 読書貯金プレミアム$5.99
Lastgrain
No in-app purchases





