# スピフル vs Duosub

The clearest difference is in-app purchases: スピフル at none against Duosub's 1. Duosub's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Duosub sells 1 in-app purchase, starting at $1.99 per month. スピフル asks for nothing beyond the download.

スピフル ships an update fortnightly, Duosub every 4 weeks. The most recent releases landed on October 16, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | スピフル | Duosub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (35 ratings)](https://appshunter.io/ios/app/id6504902019/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 weeks |
| Monetization | Freemium | — |
| Size | 49 MB | 95 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [PROGRIT Inc.](https://appshunter.io/developer/1437876016) | [GOWS LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1734173309) |

## What reviewers say

### スピフル

[App page](https://appshunter.io/ios/app/id6504902019)

This app enhances English speaking skills through AI-powered oral composition and monologue training. It offers personalized feedback and practical business scenarios to improve fluency and expression, building on proven methodologies.

**Highlights:** AI scoring and feedback, Oral composition training, Monologue English conversation practice, Real-time発話 speed measurement, Extensive business例文 library, AI speech correction

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

**In-app purchases:** none


### Duosub

[App page](https://appshunter.io/ios/app/duosub/id6507464076)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| チケット無制限プラン | $1.99 | per month |


## Frequently asked questions

### Is スピフル free?

スピフル is free to download, with no in-app purchases.

### Is Duosub free?

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

### Do スピフル or Duosub have ads?

Neither スピフル nor Duosub shows ads.

### Which is updated more often, スピフル or Duosub?

スピフル ships an update fortnightly, and Duosub every 4 weeks. Most recently, スピフル was updated on October 16, 2026 and Duosub on October 11, 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.*