ZBook vs OnlyBooks
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZBook
Organize your personal library with this app. Create custom shelves to categorize your books and easily move them between shelves. Keep your reading collection tidy and accessible.
- Add and track books
- Create custom shelves
- Move books between shelves
- Organize personal library
- Simple interface
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A small App to keep track of your books. You can add shelves to keep you books in, and change the shelf a book is on with ease.
OnlyBooks
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Your books deserve a better home than a spreadsheet. OnlyBooks turns your reading life into a beautiful virtual bookshelf — every book you own or have read, arranged as spines just like a real shelf. Add a book in seconds, watch your collection grow. A shelf that looks the part Books are rendered as spines with their real cover art and colours. Customise the wall, adjust shelf colours, and make it yours. Track what matters Log when you started and finished a book, or simply mark it as read if you can't remember the dates. Your stats page shows how many books you've read each month and how many pages you've powered through. Find any book instantly Search the Open Library catalogue of millions of titles to add books with cover art, author, year, and page count filled in automatically. Add several books at once with multi-select. Stay organised Tag books by genre, series, or anything else. Filter your shelf by tag, reading status, or month to find exactly what you're looking for. Your data, your device Everything is stored locally — no account, no cloud, no tracking. Export your entire library as a backup and import it on any device.
Screenshots
Verdict
The clearest difference is update cadence: ZBook at every 2 days against OnlyBooks's every 5 months. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
ZBook ships an update every 2 days, OnlyBooks every 5 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | ZBook | OnlyBooks |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (4 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 days — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.5 — better | 16.4 |
| Further details — not scored | ||
| Size | 0 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Ben Shabowski | Devin Smith |
In-app purchases
ZBook
No in-app purchases
OnlyBooks
No in-app purchases









