# 知米背单词 vs MemoEcho

The clearest difference is iOS requirement: 知米背单词 at 9.0 against MemoEcho's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 知米背单词 sells 12 one-off in-app purchases and MemoEcho sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

知米背单词 ships an update every 5 weeks, MemoEcho every 3 weeks. The most recent releases landed on October 22, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 知米背单词 | MemoEcho |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (468 ratings)](https://appshunter.io/ios/app/app/id893122685/reviews)** | — |
| Number of ratings | **468** | — |
| Positive reviews | 96.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 147 MB | 56 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, Mac, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [BlueBrain Educational Technology Co., Ltd.](https://appshunter.io/developer/893122688) | [振川 潘](https://appshunter.io/developer/6795733961) |

## What reviewers say

### 知米背单词

[App page](https://appshunter.io/ios/app/app/id893122685)

This app offers a fun and effective way to memorize English vocabulary, with seven mnemonic methods and scientific review techniques. It also includes grammar lessons and reading practice with authentic materials.

**Highlights:** Seven mnemonic methods for memorization, Scientific review in context, Comprehensive study data statistics, 10-hour grammar mastery, Practice with authentic reading materials, Daily bilingual news and classic books

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 600知米粒 | $0.99 | one-time |
| 词根词缀助记1个月 | $0.99 | one-time |
| 单词助记服务(1个月) | $1.99 | one-time |
| 1800知米粒 | $2.99 | one-time |
| 单词配图3个月 | $2.99 | one-time |
| 词根词缀助记3个月 | $2.99 | one-time |
| 3000知米粒 | $3.99 | one-time |
| 6800知米粒 | $9.99 | one-time |
| 单词助记服务(12个月) | $9.99 | one-time |
| 单词配图永久 | $12.99 | one-time |
| 词根词缀助记永久 | $12.99 | one-time |
| 单词助记服务(永久) | $12.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Efficient word learning
- 💡 Helpful word association features
- 🗣️ Good pronunciation examples
- 📚 Extensive word library

**What reviewers complain about**

- 🐛 Occasional bugs or crashes
- 💰 Some features require paid subscription
- 🖥️ Lack of iPad support

**Reported bugs**

- Login issues on certain devices
- Inconsistent word definitions

**Requested features**

- Improved multi-device synchronization
- More customization options
- Integration with other learning resources


### MemoEcho

[App page](https://appshunter.io/ios/app/memoecho-science-based-review/id6799892963)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MemoEcho Pro | $1.99 | per month |
| MemoEcho Pro | $14.99 | per year |


## Frequently asked questions

### Is 知米背单词 free?

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

### Is MemoEcho free?

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

### Do 知米背单词 or MemoEcho have ads?

Neither 知米背单词 nor MemoEcho shows ads.

### Which is updated more often, 知米背单词 or MemoEcho?

知米背单词 ships an update every 5 weeks, and MemoEcho every 3 weeks. Most recently, 知米背单词 was updated on October 22, 2026 and MemoEcho on October 13, 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.*