# 不背单词 vs i西亚斯

The clearest difference is review sentiment: 不背单词 at 95% against i西亚斯's 0%. 不背单词 also leads on rating (4.8 vs 1.0) and ratings volume (3.5K vs 1). i西亚斯's advantage is in-app purchases (none vs 100). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 不背单词 sells 100 one-off in-app purchases. i西亚斯 asks for nothing beyond the download.

不背单词 holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: 不背单词 has 3.5K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 95% of 不背单词's written reviews are positive against 0% of i西亚斯's.

不背单词 ships an update every 3 weeks, i西亚斯 every 10 days. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 不背单词 | i西亚斯 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.5K ratings)](https://appshunter.io/ios/app/id698570469/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/i/id1620119667/reviews) |
| Number of ratings | **3.5K** | 1 |
| Positive reviews | **94.6% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 168 MB | 41 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Beijing Is-Cool Technology Co., Ltd](https://appshunter.io/developer/1089038448) | [Zhengzhou Sias University](https://appshunter.io/developer/1620119669) |

## What reviewers say

### 不背单词

[App page](https://appshunter.io/ios/app/id698570469)

Learn English vocabulary with over 1.5 million native speaker example sentences. This app uses a science-based memory curve, root analysis, and authentic phrases to help you remember words effectively. It covers all learning stages and exam needs.

**Highlights:** 1.5 million+ native speaker example sentences, 50,000+ phrase collocations, 2,000+ root and affix lessons, 5,000+ derivation trees, Authentic Collins English-Chinese dictionary, All-stage vocabulary banks, Ebbinghaus memory curve review

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

**In-app purchases (100)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 酷币包1 | $0.99 | one-time |
| 充值4 | $0.99 | one-time |
| 充值3 | $0.99 | one-time |
| 充值6 | $0.99 | one-time |
| 充值5 | $0.99 | one-time |
| 充值10 | $0.99 | one-time |
| 充值1 | $0.99 | one-time |
| 充值9.9 | $0.99 | one-time |
| 充值8 | $0.99 | one-time |
| 充值2 | $0.99 | one-time |
| 充值9 | $0.99 | one-time |
| 充值7 | $0.99 | one-time |
| 酷币包2 | $1.99 | one-time |
| 充值15 | $1.99 | one-time |
| 充值12 | $1.99 | one-time |
| 充值11 | $1.99 | one-time |
| 充值13 | $1.99 | one-time |
| 充值16 | $1.99 | one-time |
| 酷币包3 | $2.99 | one-time |
| 充值19.9 | $2.99 | one-time |
| 充值20 | $2.99 | one-time |
| 充值24 | $2.99 | one-time |
| 充值19.8 | $2.99 | one-time |
| 充值18 | $2.99 | one-time |
| 充值19 | $2.99 | one-time |
| 充值21 | $2.99 | one-time |
| 酷币包5 | $3.99 | one-time |
| 充值30 | $3.99 | one-time |
| 充值26 | $3.99 | one-time |
| 充值28 | $3.99 | one-time |
| 充值31 | $3.99 | one-time |
| 充值25 | $3.99 | one-time |
| 充值37 | $4.99 | one-time |
| 充值35 | $4.99 | one-time |
| 充值34 | $4.99 | one-time |
| 充值36 | $4.99 | one-time |
| 充值32 | $4.99 | one-time |
| 充值38 | $4.99 | one-time |
| 酷币包6 | $5.99 | one-time |
| 酷币包7 | $5.99 | one-time |
| 充值41 | $5.99 | one-time |
| 充值39 | $5.99 | one-time |
| 充值43 | $5.99 | one-time |
| 充值45 | $5.99 | one-time |
| 酷币包8 | $6.99 | one-time |
| 充值47 | $6.99 | one-time |
| 充值46 | $6.99 | one-time |
| 充值48 | $6.99 | one-time |
| 充值49 | $6.99 | one-time |
| 充值57 | $7.99 | one-time |
| 充值58 | $7.99 | one-time |
| 酷币包9 | $8.99 | one-time |
| 酷币包12 | $9.99 | one-time |
| 充值67 | $9.99 | one-time |
| 充值70 | $9.99 | one-time |
| 充值74 | $9.99 | one-time |
| 充值73 | $9.99 | one-time |
| 充值75 | $9.99 | one-time |
| 充值76 | $9.99 | one-time |
| 充值85 | $11.99 | one-time |
| 酷币包13 | $12.99 | one-time |
| 充值94 | $12.99 | one-time |
| 充值119 | $17.99 | one-time |
| 充值116 | $17.99 | one-time |
| 酷币包20 | $19.99 | one-time |
| 酷币包22 | $19.99 | one-time |
| 充值142 | $19.99 | one-time |
| 充值147 | $19.99 | one-time |
| 充值149 | $19.99 | one-time |
| 充值129 | $19.99 | one-time |
| 充值131 | $19.99 | one-time |
| 充值139 | $19.99 | one-time |
| 酷币包23 | $22.99 | one-time |
| 充值160 | $22.99 | one-time |
| 充值158 | $22.99 | one-time |
| 充值169 | $24.99 | one-time |
| 充值177 | $24.99 | one-time |
| 充值178 | $24.99 | one-time |
| 充值176 | $24.99 | one-time |
| 充值209 | $29.99 | one-time |
| 充值220 | $29.99 | one-time |
| 充值228 | $29.99 | one-time |
| 充值233 | $34.99 | one-time |
| 充值250 | $34.99 | one-time |
| 充值238 | $34.99 | one-time |
| 充值249 | $34.99 | one-time |
| 充值248 | $34.99 | one-time |
| 酷币包19 | $39.99 | one-time |
| 酷币包 31 | $39.99 | one-time |
| 充值293 | $39.99 | one-time |
| 充值298 | $39.99 | one-time |
| 充值268 | $39.99 | one-time |
| 充值273 | $39.99 | one-time |
| 充值289 | $39.99 | one-time |
| 充值279 | $39.99 | one-time |
| 充值283 | $39.99 | one-time |
| 充值288 | $39.99 | one-time |
| 充值388 | $59.99 | one-time |
| 酷币包 34 | $69.99 | one-time |
| 充值488 | $69.99 | one-time |

**What reviewers like**

- 🌟 Comprehensive vocabulary coverage
- 👍 Intuitive and user-friendly interface
- 🎬 Helpful example sentences from movies/TV
- 💡 Effective memorization techniques
- 🎯 Customizable word lists and study plans

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🔊 Inconsistent audio volume for word pronunciations
- 🔍 Limited search and filtering options
- 🖼️ Outdated or unappealing visual design
- 🕰️ Repetitive review schedule can feel tedious

**Reported bugs**

- Login issues for users with non-Chinese phone numbers
- Compatibility problems on newer iOS/Android devices
- Unreliable syncing of progress across multiple devices

**Requested features**

- Ability to import/export custom word lists
- Integration with other language learning resources
- More personalized learning algorithms and recommendations
- Enhanced social features for group/team learning
- Expanded support for non-English vocabulary


### i西亚斯

[App page](https://appshunter.io/ios/app/i/id1620119667)

This is the official mobile application for Zhengzhou Sias University. It provides official information and services for students and faculty.

**Highlights:** Official university information, Student services, Faculty services, Campus news, University announcements

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

**In-app purchases:** none


## Frequently asked questions

### Is 不背单词 free?

不背单词 is free to download, with in-app purchases available.

### Is i西亚斯 free?

i西亚斯 is free to download, with no in-app purchases.

### Which has better reviews, 不背单词 or i西亚斯?

不背单词 is rated higher. 不背单词 averages 4.8 out of 5 from 3.5K ratings, while i西亚斯 averages 1.0 from 1 ratings.

### Do 不背单词 or i西亚斯 have ads?

Neither 不背单词 nor i西亚斯 shows ads.

### Which is updated more often, 不背单词 or i西亚斯?

不背单词 ships an update every 3 weeks, and i西亚斯 every 10 days. Most recently, 不背单词 was updated on September 22, 2026 and i西亚斯 on September 16, 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.*