# 嗯背单词 vs Sky Lingo

嗯背单词 and Sky Lingo both sit at 4.8 stars, but that hides the real split: 96% of Sky Lingo's written reviews are positive against 84% of 嗯背单词's. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. 嗯背单词 sells 2 one-off in-app purchases and Sky Lingo sells 4 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for 嗯背单词 against 4.8 for Sky Lingo. Both are backed by a comparable volume of ratings — 87 and 60 respectively. Written reviews are what separate them: 84% of 嗯背单词's written reviews are positive against 96% of Sky Lingo's.

嗯背单词 ships an update every 2 weeks, Sky Lingo every 9 days. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | 嗯背单词 | Sky Lingo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (87 ratings)](https://appshunter.io/ios/app/id6450109182/reviews)** | [4.8 (60 ratings)](https://appshunter.io/ios/app/sky-lingo-ai-language-learning/id6502421785/reviews) |
| Number of ratings | **87** | 60 |
| Positive reviews | 84.2% of reviews | **95.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 38 MB | 124 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [斌斌 沈](https://appshunter.io/developer/1509733863) | [Xiamen Sky AI Tech Co., Ltd.](https://appshunter.io/developer/1610844635) |

## What reviewers say

### 嗯背单词

[App page](https://appshunter.io/ios/app/id6450109182)

This app offers an efficient and enjoyable way to learn vocabulary using a unique state machine algorithm. It prioritizes simple words and repeats difficult ones, making memorization less painful. Enjoy a minimalist design and flexible learning options.

**Highlights:** State machine algorithm for efficient memorization, Minimalist Bauhaus-inspired design, Single-handed operation, No forced review or word debt, Vocabulary radio, Add word notes, Online dictionary with images and encyclopedic content, Import custom word lists

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 终身会员 | $4.99 | one-time |
| 终身会员 | $6.99 | one-time |


### Sky Lingo

[App page](https://appshunter.io/ios/app/sky-lingo-ai-language-learning/id6502421785)

Practice speaking any language with AI tutors available 24/7. Get instant feedback on pronunciation and grammar, and prepare for exams like IELTS with realistic simulations. Millions are learning faster through personalized conversations.

**Highlights:** 24/7 AI speaking tutors, Instant pronunciation feedback, Real-life conversation scenarios, IELTS test preparation, Grammar correction, Voice recognition technology

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month | $14.99 | per month |
| Quarter | $24.99 | per 3 months |
| Annual | $39.99 | per year |
| 3-year VIPs | $89.99 | one-time |


## Frequently asked questions

### Is 嗯背单词 free?

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

### Is Sky Lingo free?

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

### Which has better reviews, 嗯背单词 or Sky Lingo?

嗯背单词 is rated higher. 嗯背单词 averages 4.8 out of 5 from 87 ratings, while Sky Lingo averages 4.8 from 60 ratings.

### Do 嗯背单词 or Sky Lingo have ads?

Neither 嗯背单词 nor Sky Lingo shows ads.

### Which is updated more often, 嗯背单词 or Sky Lingo?

嗯背单词 ships an update every 2 weeks, and Sky Lingo every 9 days. Most recently, 嗯背单词 was updated on November 7, 2026 and Sky Lingo on November 4, 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.*