# Physics Formulas vs Kemistri

The clearest difference is iOS requirement: Physics Formulas at 15.1 against Kemistri's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Physics Formulas sells 2 in-app purchases, starting at $2.99 per 7 days and Kemistri sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Physics Formulas ships an update every 2 months, Kemistri every 5 weeks. The most recent releases landed on September 11, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Physics Formulas | Kemistri |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 38 MB | 45 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mobin Akhter](https://appshunter.io/developer/1812505286) | [EdBetter Limited](https://appshunter.io/developer/1810500957) |

## What reviewers say

### Physics Formulas

[App page](https://appshunter.io/ios/app/physics-formulas-physref/id6757826240)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $2.99 | per 7 days |
| Lifetime Access | $49.99 | one-time |


### Kemistri

[App page](https://appshunter.io/ios/app/kemistri/id6757977295)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Access Pass | $3.99 | per month |
| Quarterly Access Pass | $9.99 | per 3 months |
| Semiannual Access Pass | $17.99 | per 6 months |
| Annual Access Pass | $24.99 | per year |


## Frequently asked questions

### Is Physics Formulas free?

Physics Formulas is free to download, with in-app purchases available.

### Is Kemistri free?

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

### Do Physics Formulas or Kemistri have ads?

Neither Physics Formulas nor Kemistri shows ads.

### Which is updated more often, Physics Formulas or Kemistri?

Physics Formulas ships an update every 2 months, and Kemistri every 5 weeks. Most recently, Physics Formulas was updated on September 11, 2026 and Kemistri on September 9, 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.*