# 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 vs Attain

The clearest difference is in-app purchases: Attain at none against 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除's 3. Attain also leads on update cadence (every 2 days vs every 6 weeks) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 sells 3 in-app purchases, starting at $3.99 per month. Attain asks for nothing beyond the download.

背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 ships an update every 6 weeks, Attain every 2 days. The most recent releases landed on September 28, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 | Attain |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Size | 57 MB | 31 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [剑锋 刘](https://appshunter.io/developer/1725321361) | [AmazingTalker](https://appshunter.io/developer/1503450865) |

## What reviewers say

### 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除

[App page](https://appshunter.io/ios/app/id6480305754)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 包月 | $3.99 | per month |
| 包季 | $8.99 | per 3 months |
| 包年 | $22.99 | per year |


### Attain

[App page](https://appshunter.io/ios/app/attain/id6757837194)

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

**In-app purchases:** none


## Frequently asked questions

### Is 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 free?

背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 is free to download, with in-app purchases available.

### Is Attain free?

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

### Do 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 or Attain have ads?

Neither 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 nor Attain shows ads.

### Which is updated more often, 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 or Attain?

背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 ships an update every 6 weeks, and Attain every 2 days. Most recently, 背單字、背英單、艾賓浩斯記憶曲線固有弱點消除 was updated on September 28, 2026 and Attain on October 7, 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.*