# Book Identifier vs OpenSub

The clearest difference is rating: OpenSub at 5.0 against Book Identifier's 4.8. Book Identifier's advantage is ratings volume (9 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OpenSub holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 9 and 2 respectively.

Book Identifier ships an update fortnightly, OpenSub every 3 weeks. The most recent releases landed on October 16, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Book Identifier | OpenSub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (9 ratings)](https://appshunter.io/ios/app/book-identifier/id6758747605/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/opensub/id6762130793/reviews)** |
| Number of ratings | **9** | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free | Free |
| Size | 4 MB | 3 MB |
| Requires iOS | 18 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Kawaii](https://appshunter.io/developer/1696001381) | [Shanghai Haishi Culture Technology Co., Ltd.](https://appshunter.io/developer/1893052687) |

## What reviewers say

### Book Identifier

[App page](https://appshunter.io/ios/app/book-identifier/id6758747605)

Instantly identify books by scanning their cover or spine. Get detailed information including author, publisher, market value, and rarity. Organize your scanned books into a personal collection and explore what others have discovered.

**Highlights:** Intelligent book recognition via photo, Detailed appraisal with value and rarity, Comprehensive publication details, Personalized book collection catalog, Community archive browsing, Condition assessment and preservation tips

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### OpenSub

[App page](https://appshunter.io/ios/app/opensub/id6762130793)

This app helps you visualize and manage your recurring bills and subscriptions. It provides clear, receipt-style summaries of your spending, with customizable reminders to avoid surprise renewals. Track active and ended subscriptions with ease.

**Highlights:** Recurring bill visualization, Subscription management, Renewal and trial reminders, Auto-import from App Store, Spending summaries, Archived subscription details

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Book Identifier free?

Book Identifier is free to download, with no in-app purchases.

### Is OpenSub free?

OpenSub is free to download, with no in-app purchases.

### Which has better reviews, Book Identifier or OpenSub?

OpenSub is rated higher. Book Identifier averages 4.8 out of 5 from 9 ratings, while OpenSub averages 5.0 from 2 ratings.

### Do Book Identifier or OpenSub have ads?

Neither Book Identifier nor OpenSub shows ads.

### Which is updated more often, Book Identifier or OpenSub?

Book Identifier ships an update fortnightly, and OpenSub every 3 weeks. Most recently, Book Identifier was updated on October 16, 2026 and OpenSub on October 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*