# RST Decoder vs AI作文メーカー：完全オリジナル作文を３０秒で生成

The clearest difference is in-app purchases: RST Decoder at none against AI作文メーカー：完全オリジナル作文を３０秒で生成's 4. RST Decoder also leads on review sentiment (67% vs 33%) and update cadence (every 2 months vs every 8 months). AI作文メーカー：完全オリジナル作文を３０秒で生成's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. AI作文メーカー：完全オリジナル作文を３０秒で生成 sells 4 one-off in-app purchases. RST Decoder asks for nothing beyond the download.

RST Decoder ships an update every 2 months, AI作文メーカー：完全オリジナル作文を３０秒で生成 every 8 months. The most recent releases landed on September 8, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | RST Decoder | AI作文メーカー：完全オリジナル作文を３０秒で生成 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/rst-decoder/id1519587362/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | **66.7% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 6 MB | 12 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [reiko hori](https://appshunter.io/developer/1777370692) |

## What reviewers say

### RST Decoder

[App page](https://appshunter.io/ios/app/rst-decoder/id1519587362)

This application decodes Morse code from your microphone, acting as a practice tool to verify your keying accuracy. It offers advanced features like BPF and FFT decoders with automatic frequency and gain control, allowing for fine-tuning of reception parameters.

**Highlights:** Microphone Morse code decoding, Morse practice and keying check, BPF and FFT decoder options, Auto Frequency Detector (AFD), Auto Gain Control (AGC), Real-time CW signal display, Input signal recording/playback

**In-app purchases:** none


### AI作文メーカー：完全オリジナル作文を３０秒で生成

[App page](https://appshunter.io/ios/app/ai/id6738920715)

Generate original essays in 30 seconds with this AI-powered writing assistant. Tailor content by grade level and keywords for personalized compositions. Ideal for students, parents, and writers seeking quick creative support.

**Highlights:** 30-second essay generation, Grade-level optimization, Keyword-based content creation, Essay editing and refinement, Original composition generation

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5ポイントパック | $1.99 | one-time |
| 10ポイントパック | $2.99 | one-time |
| 30ポイントパック | $6.99 | one-time |
| 50ポイントパック | $11.99 | one-time |


## Frequently asked questions

### Is RST Decoder free?

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

### Is AI作文メーカー：完全オリジナル作文を３０秒で生成 free?

AI作文メーカー：完全オリジナル作文を３０秒で生成 is free to download, with in-app purchases available.

### Do RST Decoder or AI作文メーカー：完全オリジナル作文を３０秒で生成 have ads?

RST Decoder shows ads; AI作文メーカー：完全オリジナル作文を３０秒で生成 does not.

### Which is updated more often, RST Decoder or AI作文メーカー：完全オリジナル作文を３０秒で生成?

RST Decoder ships an update every 2 months, and AI作文メーカー：完全オリジナル作文を３０秒で生成 every 8 months. Most recently, RST Decoder was updated on September 8, 2026 and AI作文メーカー：完全オリジナル作文を３０秒で生成 on June 4, 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.*