# 51飞鸟 vs i西亚斯

The clearest difference is review sentiment: 51飞鸟 at 25% against i西亚斯's 0%. 51飞鸟 also leads on iOS requirement (12.0 vs 14.0). i西亚斯's advantage is update cadence (every 10 days vs every 6 weeks). On price, ads, in-app purchases and monetization model there is nothing between them.

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

51飞鸟 ships an update every 6 weeks, i西亚斯 every 10 days. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 51飞鸟 | i西亚斯 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/i/id1620119667/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 10 days** |
| Monetization | Free | Free |
| Size | 60 MB | 41 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [北京学研汇智网络科技有限公司](https://appshunter.io/developer/1171097549) | [Zhengzhou Sias University](https://appshunter.io/developer/1620119669) |

## What reviewers say

### 51飞鸟

[App page](https://appshunter.io/ios/app/51/id1301860494)

This application helps university students improve their English skills through online learning. It allows users to view course lists, check in online, practice tests, and communicate with peers. The platform also tracks assignment completion.

**Highlights:** Online English courses, Course list viewing, Online check-in, Practice test exercises, Peer communication, Assignment tracking

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

**In-app purchases:** none


### 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 51飞鸟 free?

51飞鸟 is free to download, with no in-app purchases.

### Is i西亚斯 free?

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

### Do 51飞鸟 or i西亚斯 have ads?

Neither 51飞鸟 nor i西亚斯 shows ads.

### Which is updated more often, 51飞鸟 or i西亚斯?

51飞鸟 ships an update every 6 weeks, and i西亚斯 every 10 days. Most recently, 51飞鸟 was updated on September 10, 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.*