# Chem_Calculator vs Periodic

The clearest difference is ads: Chem_Calculator at none against Periodic's shown. Chem_Calculator also leads on iOS requirement (10.0 vs 15.1). Periodic's advantage is update cadence (every 5 weeks vs every 4 months). 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.

Chem_Calculator ships an update every 4 months, Periodic every 5 weeks. The most recent releases landed on October 22, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Chem_Calculator | Periodic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (155 ratings)](https://appshunter.io/ios/app/chem-calculator/id1253476119/reviews)** | — |
| Number of ratings | **155** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 34 MB | 35 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [铠宁 雷](https://appshunter.io/developer/1631727209) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### Chem_Calculator

[App page](https://appshunter.io/ios/app/chem-calculator/id1253476119)

This app provides organic chemists with a molecular weight calculator featuring a full-sized periodic table. It allows for real-time calculation with mixed input of elements, numbers, and parentheses, and enables saving, editing, and deleting results.

**Highlights:** Molecular weight calculation, Full-sized periodic table, Real-time results, Save, edit, and delete calculations, Element detail lookup

**In-app purchases:** none


### Periodic

[App page](https://appshunter.io/ios/app/periodic-table-elements/id1628647298)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chem_Calculator free?

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

### Is Periodic free?

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

### Do Chem_Calculator or Periodic have ads?

Periodic shows ads; Chem_Calculator does not.

### Which is updated more often, Chem_Calculator or Periodic?

Chem_Calculator ships an update every 4 months, and Periodic every 5 weeks. Most recently, Chem_Calculator was updated on October 22, 2026 and Periodic on October 12, 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.*