# 电牙 vs Option Pricing Assistant

The clearest difference is price: 电牙 at Free against Option Pricing Assistant's $0.99. 电牙 also leads on iOS requirement (15.6 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

电牙 is free to download; Option Pricing Assistant costs $0.99 up front. 电牙 sells 3 one-off in-app purchases and Option Pricing Assistant sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 电牙 | Option Pricing Assistant |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 45 MB | 5 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Change the World (Shenzhen) Artificial Intelligence Technology Co., Ltd](https://appshunter.io/developer/1824623538) | [乐祥 胡](https://appshunter.io/developer/1572365721) |

## What reviewers say

### 电牙

[App page](https://appshunter.io/ios/app/id6748213733)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10小时转写时长包 | $3.99 | one-time |
| 30小时转写时长包 | $9.99 | one-time |
| 100小时转写时长包 | $29.99 | one-time |


### Option Pricing Assistant

[App page](https://appshunter.io/ios/app/option-pricing-assistant/id6771312371)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Option Pricing Assistant Pro-30days | $9.99 | per month |
| Option Pricing Assistant Pro-360day | $19.99 | per year |
| Option Pricing Assistant  lifetime | $49.99 | one-time |


## Frequently asked questions

### Is 电牙 free?

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

### Is Option Pricing Assistant free?

Option Pricing Assistant costs $0.99, and also offers in-app purchases.

### Do 电牙 or Option Pricing Assistant have ads?

Neither 电牙 nor Option Pricing Assistant shows ads.

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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.*