# invsi vs 单词鸭

The clearest difference is rating: 单词鸭 at 4.7 against invsi's 4.1. 单词鸭 also leads on ratings volume (26 vs 8) and iOS requirement (14 vs 17.0). invsi's advantage is ads (none vs shown) and review sentiment (100% vs 69%). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. invsi sells 4 in-app purchases, starting at $0.99 per month and 单词鸭 sells 25 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

单词鸭 holds the better App Store score, 4.7 against 4.1. Both are backed by a comparable volume of ratings — 8 and 26 respectively. Written reviews complicate that: 100% of invsi's written reviews are positive against 69% of 单词鸭's, so the app with the better star average is not the one people write more warmly about.

invsi ships an update fortnightly, 单词鸭 every 2 weeks. The most recent releases landed on September 26, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | invsi | 单词鸭 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (8 ratings)](https://appshunter.io/ios/app/invsi/id6444667120/reviews) | **[4.7 (26 ratings)](https://appshunter.io/ios/app/and-and/id6462759069/reviews)** |
| Number of ratings | 8 | **26** |
| Positive reviews | **100.0% of reviews** | 69.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 26 MB | 187 MB |
| Requires iOS | 17.0 | **14** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [新坤 杨](https://appshunter.io/developer/1655993145) | [JingKui](https://appshunter.io/developer/1676729802) |

## What reviewers say

### invsi

[App page](https://appshunter.io/ios/app/invsi/id6444667120)

This app helps parents manage their children's device usage by controlling screen time and blocking inappropriate content. It offers a local-only experience with no ads or registration, prioritizing user privacy.

**Highlights:** Screen time management, Content blocking, No advertisements, Local data storage, No registration required, Premium features via subscription

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly PRO | $0.99 | per month |
| Invsi PRO (Annual) | $4.99 | per year |
| Unlock Application Icon | $0.99 | one-time |
| Lifetime PRO | $14.99 | one-time |


### 单词鸭

[App page](https://appshunter.io/ios/app/and-and/id6462759069)

Learn vocabulary through engaging mini-games like match-3 and Sudoku. Capture objects with your camera to create custom flashcards and build your own word lists. Supports various learning methods and levels, from elementary to professional exams.

**Highlights:** Vocabulary match-3 game, Word Sudoku puzzles, Object recognition for flashcards, Customizable word lists, Spaced repetition learning, Root word memorization, Online vocabulary PK battles

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

**In-app purchases (25)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 单词鸭VIP连续包月 | $14.99 | per month |
| Monthly Super Wordln | $15.00 | per month |
| 单词鸭VIP连续包年 | $29.99 | per year |
| 单词鸭VIP连续包年 | $29.99 | per year |
| 单词鸭VIP连续包年 | $39.99 | per year |
| Annually Super Wordln | $150.00 | per year |
| 8金币 | $0.99 | one-time |
| 1000 Coins Wordln | $5.00 | one-time |
| 3000 Coins Wordln | $10.00 | one-time |
| Remove Ads | $10.00 | one-time |
| 80金币 | $11.99 | one-time |
| 单词鸭一个月VIP | $14.99 | one-time |
| 8000 Coins Wordln | $25.00 | one-time |
| 单词鸭1年VIP | $29.99 | one-time |
| 280金币 | $39.99 | one-time |
| 单词鸭2年VIP | $39.99 | one-time |
| 17000 Coins Wordln | $50.00 | one-time |
| 单词鸭3年VIP | $59.99 | one-time |
| 568金币 | $79.99 | one-time |
| 34000 Coins Wordln | $80.00 | one-time |
| 50000 Coins Wordln | $90.00 | one-time |
| 888金币 | $129.99 | one-time |
| 968金币 | $129.99 | one-time |
| 1月大型班级VIP | $299.99 | one-time |
| 1月超大型班级VIP | $599.99 | one-time |


## Frequently asked questions

### Is invsi free?

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

### Is 单词鸭 free?

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

### Which has better reviews, invsi or 单词鸭?

单词鸭 is rated higher. invsi averages 4.1 out of 5 from 8 ratings, while 单词鸭 averages 4.7 from 26 ratings.

### Do invsi or 单词鸭 have ads?

单词鸭 shows ads; invsi does not.

### Which is updated more often, invsi or 单词鸭?

invsi ships an update fortnightly, and 单词鸭 every 2 weeks. Most recently, invsi was updated on September 26, 2026 and 单词鸭 on September 22, 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.*