# 嗯背单词JP vs PolyEcho

The clearest difference is iOS requirement: PolyEcho at 13.0 against 嗯背单词JP's 16. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 嗯背单词JP sells 3 in-app purchases, starting at $2.99 per year and PolyEcho sells 4 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

嗯背单词JP ships an update every 4 days, PolyEcho every 5 days. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | 嗯背单词JP | PolyEcho |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (18 ratings)](https://appshunter.io/ios/app/jp/id6502523869/reviews)** | — |
| Number of ratings | **18** | — |
| Positive reviews | 69.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 days |
| Monetization | Freemium | — |
| Size | 771 MB | 207 MB |
| Requires iOS | 16 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [斌斌 沈](https://appshunter.io/developer/1509733863) | [楷博 尚](https://appshunter.io/developer/1801785390) |

## What reviewers say

### 嗯背单词JP

[App page](https://appshunter.io/ios/app/jp/id6502523869)

This app uses the Leitner Box algorithm for spaced repetition to help you memorize Japanese vocabulary. It offers various learning modes, customizable definitions, and high-quality pronunciation.

**Highlights:** Leitner Box spaced repetition algorithm, iCloud backup and sync, High-quality TTS pronunciation, Three learning modes (quick, spelling, dictation), Editable definitions and examples, Word notes and built-in dictionary

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 赞助会员 | $2.99 | per year |
| 终身会员 | $4.99 | one-time |
| 终身会员 | $6.99 | one-time |


### PolyEcho

[App page](https://appshunter.io/ios/app/polyecho/id6743313316)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $12.99 | per month |
| Semi-Annual Subscription | $59.99 | per 6 months |
| Annual Subscription | $99.99 | per year |
| 5-Time Conversation Credit | $2.99 | one-time |


## Frequently asked questions

### Is 嗯背单词JP free?

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

### Is PolyEcho free?

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

### Do 嗯背单词JP or PolyEcho have ads?

Neither 嗯背单词JP nor PolyEcho shows ads.

### Which is updated more often, 嗯背单词JP or PolyEcho?

嗯背单词JP ships an update every 4 days, and PolyEcho every 5 days. Most recently, 嗯背单词JP was updated on October 3, 2026 and PolyEcho on September 30, 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.*