Calculator² vs I/O Field
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator²
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.
- 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
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The smart calculator for iOS. Scientific Calculator An advanced calculator with a comprehensive set of mathematical functions including trigonometric, hyperbolic, logarithmic, exponential, factorial, combination and permutation. Over 125 mathematical and physical constants are accessible in an easy-to-navigate list. Implicit multiplication and operator precedence are supported for faster input, while the unique memory mode also provides a facility for statistical functions. Financial Calculator* A calculator with a variety of functions for performing financial calculations, such as determining the monthly payments on a loan or the price of an item after tax has been applied. Individual rates can be set for markup, discount, tax and interest. Perfect for students and professionals who wish to verify the results of time value of money calculations. Programmer Calculator A powerful tool for conversions between decimal, hexadecimal, octal and binary number bases, with a unique view for entering ASCII keys. Bitwise operations including AND, OR, XOR and NOT are available, in addition to functions not usually found in a programmer calculator, such as square and factorial. Basic Calculator A simple, easy-to-use calculator for quick, everyday calculations. Currency Converter* A currency calculator providing accurate conversions between 150+ World currencies. The exchange rates are easily updated to real-time values from the Open Exchange Rates API, while favourite currency conversions can be saved for easy comparisons. Unit Converter A comprehensive unit converter with over 200 units across 26 categories, including temperature, fuel consumption, viscosity, radiation and more. * The Financial Calculator and Currency Converter are unlocked by an in-app purchase
I/O Field
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The “WAGO I/O Field” app is for monitoring and full operation of the WAGO I/O System Field. This app allows you to display device information for both fieldbus modules and IO-Link hubs, make settings and adjust all device parameters. The communication this requires takes place through the Bluetooth® interface of the mobile device once Data Matrix has been scanned to select the device. Users and the associated access rights can be set up and managed. Outputs can be forced and inputs set in order to support commissioning of systems. The current measured values of a port can be displayed (temperature, voltage, current and states) and configured (including operating mode and filters). Devices can be reset to the factory settings and firmware restarted. License Agreement By downloading the app, you agree to the terms of the WAGO’s license agreement (accessible via EULA and the support URL below).
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Calculator² | I/O Field |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 3 months — better | Every 14 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 12.4 |
| Further details — not scored | ||
| Size | 78 MB | 123 MB |
| Age rating | 4+ | 4+ |
| Developer | Richard Walters | WAGO Kontakttechnik GmbH & Co. KG |
In-app purchases
Calculator²
- Financial Calculator$0.99
- Currency Converter$0.99
- Calculator² Premium$1.99
I/O Field
No in-app purchases









