# Chemical Kinetics vs Periodic

The clearest difference is price: Periodic at Free against Chemical Kinetics's $3.99. Periodic also leads on update cadence (every 5 weeks vs every 4 months) and iOS requirement (15.1 vs 17.0). Chemical Kinetics's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Periodic is free to download; Chemical Kinetics costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Chemical Kinetics ships an update every 4 months, Periodic every 5 weeks. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Chemical Kinetics | Periodic |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Size | 2 MB | 35 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### Chemical Kinetics

[App page](https://appshunter.io/ios/app/chemical-kinetics/id982593180)

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

**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 Chemical Kinetics free?

Chemical Kinetics costs $3.99, with no in-app purchases.

### Is Periodic free?

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

### Do Chemical Kinetics or Periodic have ads?

Periodic shows ads; Chemical Kinetics does not.

### Which is updated more often, Chemical Kinetics or Periodic?

Chemical Kinetics ships an update every 4 months, and Periodic every 5 weeks. Most recently, Chemical Kinetics was updated on November 1, 2026 and Periodic 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.*