# 북플립 vs 사락

The clearest difference is review sentiment: 북플립 at 100% against 사락's 45%. 북플립 also leads on rating (4.8 vs 4.0) and update cadence (every 10 days vs every 2 months). 사락's advantage is in-app purchases (none vs 3). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. 북플립 sells 3 one-off in-app purchases. 사락 asks for nothing beyond the download.

북플립 holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews point the same way: 100% of 북플립's written reviews are positive against 45% of 사락's.

북플립 ships an update every 10 days, 사락 every 2 months. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | 북플립 | 사락 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/id1483409067/reviews)** | [4.0 (3 ratings)](https://appshunter.io/ios/app/24/id6447539223/reviews) |
| Number of ratings | **5** | 3 |
| Positive reviews | **100.0% of reviews** | 45.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 94 MB | 69 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HANA CHEMICAL CO.,LTD](https://appshunter.io/developer/1456341337) | [예스24](https://appshunter.io/developer/360051539) |

## What reviewers say

### 북플립

[App page](https://appshunter.io/ios/app/id1483409067)

Manage your personal library and discover new books through community insights. Track reading progress, organize books with custom tags, and analyze your reading habits with detailed statistics. Connect with other readers, share reviews, and explore curated collections.

**Highlights:** Personal library creation, Bookmark and rating system, Reading status categorization, Private notes and public reviews, Photo and quote logging, Reading habit analysis and statistics, Social sharing and following, Book discovery through community reviews

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 북플립 플러스 1개월 | $1.99 | one-time |
| 북플립 플러스 6개월 | $11.99 | one-time |
| 북플립 플러스 12개월 | $17.99 | one-time |


### 사락

[App page](https://appshunter.io/ios/app/24/id6447539223)

Create a personalized reading journal, connect with fellow book lovers, and discover new titles. Track your reading progress, share reviews, and join or create book clubs. Earn rewards for your engagement.

**Highlights:** Personalized reading journal, Book review sharing, Book club participation and creation, Reading progress tracking, Content recommendations, Photo-based note-taking

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

**In-app purchases:** none


## Frequently asked questions

### Is 북플립 free?

북플립 is free to download, with in-app purchases available.

### Is 사락 free?

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

### Which has better reviews, 북플립 or 사락?

북플립 is rated higher. 북플립 averages 4.8 out of 5 from 5 ratings, while 사락 averages 4.0 from 3 ratings.

### Do 북플립 or 사락 have ads?

Neither 북플립 nor 사락 shows ads.

### Which is updated more often, 북플립 or 사락?

북플립 ships an update every 10 days, and 사락 every 2 months. Most recently, 북플립 was updated on November 11, 2026 and 사락 on November 7, 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.*