# Twin vs ZeroZip

The clearest difference is price: ZeroZip at Free against Twin's $1.99. ZeroZip also leads on iOS requirement (13.0 vs 15.0). Twin's advantage is in-app purchases (none vs 1) and update cadence (fortnightly vs every 2 months). On ads and device support there is nothing between them.

ZeroZip is free to download; Twin costs $1.99 up front. ZeroZip sells 1 one-off in-app purchase. Twin asks for nothing beyond the download.

Twin ships an update fortnightly, ZeroZip every 2 months. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Twin | ZeroZip |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/twin-calc/id1619292082/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 76.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Paid | — |
| Size | 1 MB | 28 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Ueda](https://appshunter.io/developer/473279916) | [genghong Xie](https://appshunter.io/developer/1785558382) |

## 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

**In-app purchases:** none


### ZeroZip

[App page](https://appshunter.io/ios/app/zerozip/id6755241805)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-Free | $1.99 | one-time |


## Frequently asked questions

### Is Twin free?

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

### Is ZeroZip free?

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

### Do Twin or ZeroZip have ads?

Neither Twin nor ZeroZip shows ads.

### Which is updated more often, Twin or ZeroZip?

Twin ships an update fortnightly, and ZeroZip every 2 months. Most recently, Twin was updated on October 17, 2026 and ZeroZip on October 11, 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.*