# i単語帳 vs ひたすら積分

The clearest difference is price: ひたすら積分 at Free against i単語帳's $1.99. ひたすら積分 also leads on device support (3 vs 1) and iOS requirement (13.0 vs 26.0). i単語帳's advantage is ads (none vs shown). On in-app purchases there is nothing between them.

ひたすら積分 is free to download; i単語帳 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | i単語帳 | ひたすら積分 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 55.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | — |
| Monetization | Paid | — |
| Size | 8 MB | 21 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [aill, k.k. (JP)](https://appshunter.io/developer/293879399) | [nihei keita](https://appshunter.io/developer/1866466968) |

## What reviewers say

### i単語帳

[App page](https://appshunter.io/ios/app/i/id515863677)

This app combines the tactile feel of physical flashcards with digital efficiency. It uses a scientific approach to optimize memorization by re-presenting cards at scientifically determined intervals. Easily manage and import your vocabulary lists for effective learning.

**Highlights:** Realistic card-flipping simulation, Automatic spaced repetition learning, Pre-loaded 600 common English words, CSV file import for bulk vocabulary entry, Cross-vocabulary search, Customizable card and text colors

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

**In-app purchases:** none


### ひたすら積分

[App page](https://appshunter.io/ios/app/id6774960981)

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

**In-app purchases:** none


## Frequently asked questions

### Is i単語帳 free?

i単語帳 costs $1.99, with no in-app purchases.

### Is ひたすら積分 free?

ひたすら積分 is free to download, with no in-app purchases.

### Do i単語帳 or ひたすら積分 have ads?

ひたすら積分 shows ads; i単語帳 does not.

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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.*