# OPEAM vs ES 计算器

The clearest difference is in-app purchases: OPEAM at none against ES 计算器's 6. OPEAM also leads on device support and iOS requirement (9.0 vs 12.0). On price there is nothing between them.

Both are free to download. ES 计算器 sells 6 in-app purchases, starting at $3.99 per month. OPEAM asks for nothing beyond the download.

## The numbers

| Metric | OPEAM | ES 计算器 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/es/id6502588790/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | — |
| Update frequency | Every 4 weeks | — |
| Monetization | — | Freemium |
| Size | 30 MB | 10 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [广东中设智控科技股份有限公司](https://appshunter.io/developer/1132541281) | [Chongqing Breeze Technology Co., LTD](https://appshunter.io/developer/1745715341) |

## What reviewers say

### OPEAM

[App page](https://appshunter.io/ios/app/opeam/id1250029156)

**Features:** macOS Compatibility

**In-app purchases:** none


### ES 计算器

[App page](https://appshunter.io/ios/app/es/id6502588790)

This calculator app offers real-time results, supports bracket operations, and allows for easy editing of input. It features quick operations, saves calculation history, and boasts an extremely fast startup time.

**Highlights:** Supports bracket operations, Real-time calculation results, Editable input process, Saves calculation history, Quick operations, Millisecond startup time

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| vip/月 | $3.99 | per month |
| 会员三月 | $7.99 | per 3 months |
| vip/年 | $24.99 | per year |
| VIP一年 | $24.99 | per year |
| VIP一年 | $29.99 | per year |
| VIP一年(定制版) | $29.99 | per year |


## Frequently asked questions

### Is OPEAM free?

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

### Is ES 计算器 free?

ES 计算器 is free to download, with in-app purchases available.

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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.*