# Hardness Unit Converter vs 计算器 EMMO

The clearest difference is review sentiment: 计算器 EMMO at 85% against Hardness Unit Converter's 17%. 计算器 EMMO also leads on rating (5.0 vs 4.0) and update cadence (monthly vs every 5 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Hardness Unit Converter costs $1.99 and 计算器 EMMO $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

计算器 EMMO holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 7 and 20 respectively. Written reviews point the same way: 17% of Hardness Unit Converter's written reviews are positive against 85% of 计算器 EMMO's.

Hardness Unit Converter ships an update every 5 months, 计算器 EMMO monthly. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Hardness Unit Converter | 计算器 EMMO |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | [4.0 (7 ratings)](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484/reviews) | **[5.0 (20 ratings)](https://appshunter.io/ios/app/emmo/id1605744253/reviews)** |
| Number of ratings | 7 | **20** |
| Positive reviews | 16.7% of reviews | **85.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 1 MB | 10 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kei Suefuji](https://appshunter.io/developer/1388335881) | [EMMO Corp.](https://appshunter.io/developer/1507868195) |

## What reviewers say

### Hardness Unit Converter

[App page](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484)

Easily convert hardness values between 12 different units, including Vickers, Brinell, Rockwell, and Shore. Input your value and select the desired unit for instant conversion, referencing ASTM E 140 standards and polynomial approximations for accuracy.

**Highlights:** Converts 12 hardness units, Vickers, Brinell, Rockwell, Shore support, Tensile strength conversion, ASTM E 140 reference, Polynomial approximation for data, Simple input and unit selection

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

**In-app purchases:** none


### 计算器 EMMO

[App page](https://appshunter.io/ios/app/emmo/id1605744253)

A professional scientific calculator with a user-friendly interface and customizable themes. It offers advanced functions beyond the standard system calculator, along with a history log for easy access to past calculations.

**Highlights:** Advanced scientific functions, Customizable themes, History log, Multiple sound effects, Smart and convenient operation

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

**In-app purchases:** none


## Frequently asked questions

### Is Hardness Unit Converter free?

Hardness Unit Converter costs $1.99, with no in-app purchases.

### Is 计算器 EMMO free?

计算器 EMMO costs $1.99, with no in-app purchases.

### Which has better reviews, Hardness Unit Converter or 计算器 EMMO?

计算器 EMMO is rated higher. Hardness Unit Converter averages 4.0 out of 5 from 7 ratings, while 计算器 EMMO averages 5.0 from 20 ratings.

### Do Hardness Unit Converter or 计算器 EMMO have ads?

Neither Hardness Unit Converter nor 计算器 EMMO shows ads.

### Which is updated more often, Hardness Unit Converter or 计算器 EMMO?

Hardness Unit Converter ships an update every 5 months, and 计算器 EMMO monthly. Most recently, Hardness Unit Converter was updated on October 29, 2026 and 计算器 EMMO 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.*