# Fast Molality Calculator vs Trustity Authenticator

The clearest difference is ads: Trustity Authenticator at none against Fast Molality Calculator's shown. Trustity Authenticator also leads on update cadence (every 5 months vs every 35 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fast Molality Calculator ships an update every 35 months, Trustity Authenticator every 5 months. The most recent releases landed on October 13, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Fast Molality Calculator | Trustity Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 35 months | **Every 5 months** |
| Size | 30 MB | 29 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [JIN-HYUNG KIM](https://appshunter.io/developer/1692050199) | [Tal Yosef](https://appshunter.io/developer/1691923589) |

## What reviewers say

### Fast Molality Calculator

[App page](https://appshunter.io/ios/app/fast-molality-calculator/id6451112827)

**Features:** macOS Compatibility

**In-app purchases:** none


### Trustity Authenticator

[App page](https://appshunter.io/ios/app/trustity-authenticator/id6760598675)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fast Molality Calculator free?

Fast Molality Calculator is free to download, with no in-app purchases.

### Is Trustity Authenticator free?

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

### Do Fast Molality Calculator or Trustity Authenticator have ads?

Fast Molality Calculator shows ads; Trustity Authenticator does not.

### Which is updated more often, Fast Molality Calculator or Trustity Authenticator?

Fast Molality Calculator ships an update every 35 months, and Trustity Authenticator every 5 months. Most recently, Fast Molality Calculator was updated on October 13, 2026 and Trustity Authenticator on October 19, 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.*