# SERIES vs 성북u

The clearest difference is rating: SERIES at 4.5 against 성북u's 3.0. SERIES also leads on ratings volume (2K vs 2) and chart position (#63 vs unranked). 성북u's advantage is in-app purchases (none vs 15) and ads (none vs shown). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. SERIES sells 14 one-off in-app purchases. 성북u asks for nothing beyond the download.

SERIES holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: SERIES has 2K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 30% of SERIES's written reviews are positive against 33% of 성북u's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | SERIES | 성북u |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2K ratings)](https://appshunter.io/ios/app/series/id433592412/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/u/id472920010/reviews) |
| Number of ratings | **2K** | 2 |
| Positive reviews | 29.7% of reviews | **33.3% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#63** | — |
| Size | 198 MB | 19 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [NAVER WEBTOON Ltd.](https://appshunter.io/developer/1241166143) | [(주)이씨오](https://appshunter.io/developer/371073988) |

## What reviewers say

### SERIES

[App page](https://appshunter.io/ios/app/series/id433592412)

**Currently charting:** #63 Top Grossing · Book (US App Store)

Explore a vast library of over 160,000 webtoons and web novels. Get personalized recommendations, enjoy exclusive content, and benefit from daily free passes and time-limited deals. Customize your reading experience with TTS and adjustable settings.

**Highlights:** Personalized recommendations, Exclusive content, Daily free passes, Time Deal events, TTS function, Customizable reading settings

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

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 쿠키 10개 | $0.49 | one-time |
| 쿠키 10개 | $0.99 | one-time |
| 쿠키 30개 | $1.99 | one-time |
| 쿠키 50개 | $3.99 | one-time |
| 쿠키 49개 | $4.99 | one-time |
| 쿠키 100 | $6.99 | one-time |
| 쿠키 100개 | $9.99 | one-time |
| 쿠키 200개 | $14.99 | one-time |
| 쿠키 175개 | $14.99 | one-time |
| 쿠키 250개 | $19.99 | one-time |
| 쿠키 300개 | $22.99 | one-time |
| 쿠키 300개 + 보너스 쿠키 30개 | $24.99 | one-time |
| 쿠키 325개 | $29.99 | one-time |
| 쿠키 500개 | $39.99 | one-time |

**What reviewers like**

- 👍 Great app for reading stories
- 💡 Diverse content selection
- 🚀 Smooth performance

**What reviewers complain about**

- 🐛 Login issues
- 🔒 Restrictive access for non-Koreans
- 💸 Inconvenient payment/purchase process
- 🚫 Lack of translation/localization features

**Reported bugs**

- App crashes and freezes
- Inconsistent content display issues
- Syncing/download problems

**Requested features**

- Add translation/language support
- Improve payment options for international users
- Implement a more user-friendly login/authentication process


### 성북u

[App page](https://appshunter.io/ios/app/u/id472920010)

This app unifies multiple libraries in the Seongbuk district, offering a single platform to search for and manage library resources. Users can reserve books, check loan status, and access their borrowing history across all integrated branches.

**Highlights:** Integrated library search, Book reservations and cancellations, Loan status and history, Renewal requests, Interlibrary loan applications, User authentication for services

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

**In-app purchases:** none


## Frequently asked questions

### Is SERIES free?

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

### Is 성북u free?

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

### Which has better reviews, SERIES or 성북u?

SERIES is rated higher. SERIES averages 4.5 out of 5 from 2K ratings, while 성북u averages 3.0 from 2 ratings.

### Do SERIES or 성북u have ads?

SERIES shows ads; 성북u does not.

### Which is updated more often, SERIES or 성북u?

SERIES ships an update every 3 weeks, and 성북u every 3 weeks. Most recently, SERIES was updated on October 13, 2026 and 성북u 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.*