# Twin vs Noise Diary

The clearest difference is price: Noise Diary at $0.99 against Twin's $1.99. Noise Diary also leads on iOS requirement (13.0 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Twin costs $1.99 and Noise Diary $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Twin ships an update fortnightly, Noise Diary weekly. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Twin | Noise Diary |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/twin-calc/id1619292082/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Paid | — |
| Size | 1 MB | 25 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Ueda](https://appshunter.io/developer/473279916) | [Christopher Lamb](https://appshunter.io/developer/1484679049) |

## What reviewers say

### Twin

[App page](https://appshunter.io/ios/app/twin-calc/id1619292082)

This app combines two calculators into one, allowing for side-by-side or stacked calculations. Easily copy and paste results between calculators or to other apps. It displays formulas for clarity and handles basic arithmetic operations.

**Highlights:** Two calculators in one, Side-by-side and stacked display, One-touch copy/paste between calculators, Copy results to iPhone memory, Formula display, Basic arithmetic operations

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none


### Noise Diary

[App page](https://appshunter.io/ios/app/noise-diary/id6747617668)

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

**In-app purchases:** none


## Frequently asked questions

### Is Twin free?

Twin costs $1.99, with no in-app purchases.

### Is Noise Diary free?

Noise Diary costs $0.99, with no in-app purchases.

### Do Twin or Noise Diary have ads?

Neither Twin nor Noise Diary shows ads.

### Which is updated more often, Twin or Noise Diary?

Twin ships an update fortnightly, and Noise Diary weekly. Most recently, Twin was updated on November 7, 2026 and Noise Diary on November 5, 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.*