# THE CURVE vs E

The clearest difference is in-app purchases: THE CURVE at none against E's 3. E's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. E sells 3 in-app purchases, starting at $5.99 per month. THE CURVE asks for nothing beyond the download.

## The numbers

| Metric | THE CURVE | E |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/the-curve-flashcards/id6535682630/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | — |
| Monetization | Ad-supported | — |
| Size | 49 MB | 77 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yoshinori Tsuchiya](https://appshunter.io/developer/1685599976) | [Sota Kondo](https://appshunter.io/developer/1696498621) |

## What reviewers say

### THE CURVE

[App page](https://appshunter.io/ios/app/the-curve-flashcards/id6535682630)

Create custom flashcards for efficient learning based on the forgetting curve. Review challenging material strategically to optimize memory retention for various subjects and exams.

**Highlights:** Create custom flashcards, Supports language learning and exam prep, Learning modes based on forgetting curve, Review challenging cards intensively, Track learning levels with progress indicators

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

**In-app purchases:** none


### E

[App page](https://appshunter.io/ios/app/e-tango/id6756252774)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Light Plan | $5.99 | per month |
| Monthly Standard Plan | $9.99 | per month |
| Annual Standard Plan | $89.99 | per year |


## Frequently asked questions

### Is THE CURVE free?

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

### Is E free?

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

### Do THE CURVE or E have ads?

Both THE CURVE and E show ads.

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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.*