# RST 599TK Pro vs SpeakFlow AI Shadowing

The clearest difference is price: SpeakFlow AI Shadowing at Free against RST 599TK Pro's $2.99. SpeakFlow AI Shadowing also leads on update cadence (every 2 weeks vs every 3 months). RST 599TK Pro's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

SpeakFlow AI Shadowing is free to download; RST 599TK Pro costs $2.99 up front. SpeakFlow AI Shadowing sells 2 in-app purchases, starting at $2.99 per month. RST 599TK Pro asks for nothing beyond the download.

RST 599TK Pro ships an update every 3 months, SpeakFlow AI Shadowing every 2 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | RST 599TK Pro | SpeakFlow AI Shadowing |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 32 MB | 14 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [Shota Iwamatsu](https://appshunter.io/developer/1831883201) |

## What reviewers say

### RST 599TK Pro

[App page](https://appshunter.io/ios/app/rst-599tk-pro/id1511628467)

**In-app purchases:** none


### SpeakFlow AI Shadowing

[App page](https://appshunter.io/ios/app/speakflow-ai-shadowing/id6749724544)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan (Monthly) | $2.99 | per month |
| Premium Plan (Annual) | $29.99 | per year |


## Frequently asked questions

### Is RST 599TK Pro free?

RST 599TK Pro costs $2.99, with no in-app purchases.

### Is SpeakFlow AI Shadowing free?

SpeakFlow AI Shadowing is free to download, with in-app purchases available.

### Do RST 599TK Pro or SpeakFlow AI Shadowing have ads?

Neither RST 599TK Pro nor SpeakFlow AI Shadowing shows ads.

### Which is updated more often, RST 599TK Pro or SpeakFlow AI Shadowing?

RST 599TK Pro ships an update every 3 months, and SpeakFlow AI Shadowing every 2 weeks. Most recently, RST 599TK Pro was updated on November 7, 2026 and SpeakFlow AI Shadowing on October 30, 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.*