# Calculator² vs I/O Field

The clearest difference is in-app purchases: I/O Field at none against Calculator²'s 3. Calculator²'s advantage is update cadence (every 3 months vs every 14 months) and iOS requirement (9.0 vs 12.4). On price, ads and device support there is nothing between them.

Both are free to download. Calculator² sells 3 one-off in-app purchases. I/O Field asks for nothing beyond the download.

Calculator² ships an update every 3 months, I/O Field every 14 months. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Calculator² | I/O Field |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 14 months |
| Monetization | Free with in-app purchases | — |
| Size | 78 MB | 123 MB |
| Requires iOS | **9.0** | 12.4 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Richard Walters](https://appshunter.io/developer/1137474748) | [WAGO Kontakttechnik GmbH & Co. KG](https://appshunter.io/developer/726217018) |

## What reviewers say

### Calculator²

[App page](https://appshunter.io/ios/app/calculator/id1137474749)

This app offers a suite of specialized calculators, including scientific, financial, programmer, and basic functions. It also features a currency converter and a comprehensive unit converter for various needs.

**Highlights:** Scientific calculator with advanced functions, Financial calculator for loan and tax calculations, Programmer calculator for number base conversions, Currency converter with real-time rates, Unit converter for over 200 units, Basic calculator for everyday use

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Financial Calculator | $0.99 | one-time |
| Currency Converter | $0.99 | one-time |
| Calculator² Premium | $1.99 | one-time |


### I/O Field

[App page](https://appshunter.io/ios/app/io-field/id1475074379)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calculator² free?

Calculator² is free to download, with in-app purchases available.

### Is I/O Field free?

I/O Field is free to download, with no in-app purchases.

### Do Calculator² or I/O Field have ads?

Neither Calculator² nor I/O Field shows ads.

### Which is updated more often, Calculator² or I/O Field?

Calculator² ships an update every 3 months, and I/O Field every 14 months. Most recently, Calculator² was updated on November 2, 2026 and I/O Field on November 6, 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.*