# Chemist Calc vs Prime Arch Int.

The clearest difference is in-app purchases: Prime Arch Int. at none against Chemist Calc's 1. Prime Arch Int. also leads on update cadence (every 4 months vs every 9 months). Chemist Calc's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Chemist Calc sells 1 one-off in-app purchase. Prime Arch Int. asks for nothing beyond the download.

Chemist Calc ships an update every 9 months, Prime Arch Int. every 4 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Chemist Calc | Prime Arch Int. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chemist-calc/id1052603017/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 11 MB | 54 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) | [aRway AB](https://appshunter.io/developer/1421779695) |

## What reviewers say

### Chemist Calc

[App page](https://appshunter.io/ios/app/chemist-calc/id1052603017)

This app serves as a smart chemistry calculator for converting between moles and grams. It also provides a comprehensive periodic table with element specifications and unit conversion tools.

**Highlights:** Mole to gram conversion, Gram to mole conversion, Periodic table with element specifications, Unit conversion, Learn chemistry signs

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ad's | $0.99 | one-time |


### Prime Arch Int.

[App page](https://appshunter.io/ios/app/prime-arch-int/id1492454234)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Chemist Calc free?

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

### Is Prime Arch Int. free?

Prime Arch Int. is free to download, with no in-app purchases.

### Do Chemist Calc or Prime Arch Int. have ads?

Prime Arch Int. shows ads; Chemist Calc does not.

### Which is updated more often, Chemist Calc or Prime Arch Int.?

Chemist Calc ships an update every 9 months, and Prime Arch Int. every 4 months. Most recently, Chemist Calc was updated on November 2, 2026 and Prime Arch Int. on November 7, 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.*