# IDIY vs 英作文が身につくアプリ！ BT Writing

The clearest difference is update cadence: IDIY at fortnightly against 英作文が身につくアプリ！ BT Writing's every 3 months. On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. IDIY sells 16 one-off in-app purchases and 英作文が身につくアプリ！ BT Writing sells 2 in-app purchases, starting at $4.49 per month. Whichever you choose, the download price is not the number that matters.

IDIY ships an update fortnightly, 英作文が身につくアプリ！ BT Writing every 3 months. The most recent releases landed on October 16, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | IDIY | 英作文が身につくアプリ！ BT Writing |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 48.8% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 70 MB | 26 MB |
| Requires iOS | **16** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ROUTINGSYSTEMS. INC](https://appshunter.io/developer/1149802102) | [Best Teacher, Inc.](https://appshunter.io/developer/1130896870) |

## What reviewers say

### IDIY

[App page](https://appshunter.io/ios/app/idiy/id1363811179)

Receive personalized English writing feedback from instructors worldwide. Improve your writing skills through daily prompts, custom submissions, and interactive messaging. Access free online English courses to supplement your learning.

**Highlights:** Personalized English writing feedback, Daily writing prompts, Upload your own English texts, Instructor messaging, Free online English courses, Progress tracking, Native and bilingual instructors

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

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CEFR A2レベル単語帳 | $4.99 | one-time |
| CEFR B2レベル単語帳 | $4.99 | one-time |
| CEFR C1レベル単語帳 | $4.99 | one-time |
| CEFR B1レベル単語帳 | $4.99 | one-time |
| CEFR A1レベル単語帳 | $4.99 | one-time |
| CEFR C2レベル単語帳 | $4.99 | one-time |
| 500ポイント | $39.99 | one-time |
| 700ポイント | $59.99 | one-time |
| 1000ポイント | $69.99 | one-time |
| 学べるプランライト50単語 3ヶ月 | $149.99 | one-time |
| 2000ポイント | $149.99 | one-time |
| 学べるプランスタンダードプラス50単語 3ヶ月 | $229.99 | one-time |
| 学べるプランライト100単語 3ヶ月 | $299.99 | one-time |
| 学べるプランスタンダードプラス100単語 3ヶ月 | $349.99 | one-time |
| 学べるプランライト200単語 3ヶ月 | $599.99 | one-time |
| 学べるプランスタンダードプラス200単語 3ヶ月 | $699.99 | one-time |


### 英作文が身につくアプリ！ BT Writing

[App page](https://appshunter.io/ios/app/bt-writing/id1438836695)

This app helps you improve your English composition skills through a five-step process, from grammar review to writing your own sentences. It offers original content created by education professionals and feedback from native speakers.

**Highlights:** Grammar confirmation, Fill-in-the-blank exercises, Sentence ordering practice, Original essay writing, Native speaker feedback, Audio playback and dictation, Progressive learning steps

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム会員 | $4.49 | per month |
| チケット | $0.99 | one-time |


## Frequently asked questions

### Is IDIY free?

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

### Is 英作文が身につくアプリ！ BT Writing free?

英作文が身につくアプリ！ BT Writing is free to download, with in-app purchases available.

### Do IDIY or 英作文が身につくアプリ！ BT Writing have ads?

Neither IDIY nor 英作文が身につくアプリ！ BT Writing shows ads.

### Which is updated more often, IDIY or 英作文が身につくアプリ！ BT Writing?

IDIY ships an update fortnightly, and 英作文が身につくアプリ！ BT Writing every 3 months. Most recently, IDIY was updated on October 16, 2026 and 英作文が身につくアプリ！ BT Writing on October 29, 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.*