# OPEAM vs Best Proportion Calc

The clearest difference is ads: OPEAM at none against Best Proportion Calc's shown. OPEAM also leads on update cadence (every 4 weeks vs every 2 months) and iOS requirement (9.0 vs 14.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OPEAM ships an update every 4 weeks, Best Proportion Calc every 2 months. The most recent releases landed on September 20, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | OPEAM | Best Proportion Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/best-proportion-calc/id6474536406/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | — | Ad-supported |
| Size | 30 MB | 4 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPod | 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) | [Denis Belmont](https://appshunter.io/developer/1174113984) |

## What reviewers say

### OPEAM

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Best Proportion Calc

[App page](https://appshunter.io/ios/app/best-proportion-calc/id6474536406)

Easily solve proportion problems with a simple and intuitive interface. This app uses the cross product method for quick and accurate calculations across various fields like finance and science. It's available offline and free to use.

**Highlights:** Intuitive proportion calculation, Cross product method for solving equations, Versatile for finance, science, and more, Offline functionality, Free to use

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OPEAM free?

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

### Is Best Proportion Calc free?

Best Proportion Calc is free to download, with no in-app purchases.

### Do OPEAM or Best Proportion Calc have ads?

Best Proportion Calc shows ads; OPEAM does not.

### Which is updated more often, OPEAM or Best Proportion Calc?

OPEAM ships an update every 4 weeks, and Best Proportion Calc every 2 months. Most recently, OPEAM was updated on September 20, 2026 and Best Proportion Calc on September 13, 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.*