# Not Another Twin Calculator vs Focus Protocol

The clearest difference is price: Not Another Twin Calculator at Free against Focus Protocol's $0.99. Not Another Twin Calculator also leads on iOS requirement (16.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Not Another Twin Calculator is free to download; Focus Protocol costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Not Another Twin Calculator ships an update every 2 months, Focus Protocol every 6 weeks. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Not Another Twin Calculator | Focus Protocol |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Size | 10 MB | 2 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andy Arevalo](https://appshunter.io/developer/1853674132) | [Alice-Georgiana TURCANU](https://appshunter.io/developer/1834220789) |

## What reviewers say

### Not Another Twin Calculator

[App page](https://appshunter.io/ios/app/not-another-twin-calculator/id6755574828)

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

**In-app purchases:** none


### Focus Protocol

[App page](https://appshunter.io/ios/app/focus-protocol/id6757204088)

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

**In-app purchases:** none


## Frequently asked questions

### Is Not Another Twin Calculator free?

Not Another Twin Calculator is free to download, with no in-app purchases.

### Is Focus Protocol free?

Focus Protocol costs $0.99, with no in-app purchases.

### Do Not Another Twin Calculator or Focus Protocol have ads?

Neither Not Another Twin Calculator nor Focus Protocol shows ads.

### Which is updated more often, Not Another Twin Calculator or Focus Protocol?

Not Another Twin Calculator ships an update every 2 months, and Focus Protocol every 6 weeks. Most recently, Not Another Twin Calculator was updated on October 25, 2026 and Focus Protocol on October 15, 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.*