# Abac vs EM by SIMAX

The clearest difference is update cadence: EM by SIMAX at every 6 weeks against Abac's every 4 months. On price, ads, 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.

Abac ships an update every 4 months, EM by SIMAX every 6 weeks. The most recent releases landed on September 24, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Abac | EM by SIMAX |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 32 MB | 22 MB |
| Requires iOS | **15.2** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mathieu Ribeiro](https://appshunter.io/developer/1273974810) | [Groupe Roederer](https://appshunter.io/developer/1337779396) |

## What reviewers say

### Abac

[App page](https://appshunter.io/ios/app/abac/id1551131912)

This utility app helps users calculate SF6 gas pressure based on ambient temperature, check densistat thresholds, and determine dew point. It is designed to be a comprehensive tool for specific industrial needs and will be improved with future updates.

**Highlights:** SF6 pressure conversion, Ambient temperature factor, Densistat threshold verification, Dew point calculation, Regular updates

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

**In-app purchases:** none


### EM by SIMAX

[App page](https://appshunter.io/ios/app/em-by-simax/id6745510133)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Abac free?

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

### Is EM by SIMAX free?

EM by SIMAX is free to download, with no in-app purchases.

### Do Abac or EM by SIMAX have ads?

Neither Abac nor EM by SIMAX shows ads.

### Which is updated more often, Abac or EM by SIMAX?

Abac ships an update every 4 months, and EM by SIMAX every 6 weeks. Most recently, Abac was updated on September 24, 2026 and EM by SIMAX 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.*