# 4 vs I&C Tech Tools

The clearest difference is in-app purchases: 4 at none against I&C Tech Tools's 2. I&C Tech Tools's advantage is update cadence (every 4 days vs every 11 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. I&C Tech Tools sells 2 in-app purchases, starting at $4.99 per month. 4 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.0 for 4 against 3.0 for I&C Tech Tools. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

4 ships an update every 11 months, I&C Tech Tools every 4 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 4 | I&C Tech Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/4-20-temperature-calculator/id1602351736/reviews) | [3.0 (2 ratings)](https://appshunter.io/ios/app/i-and-c-tech-tools/id6756155332/reviews) |
| Number of ratings | 2 | 2 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 30 MB | 43 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mantas Kamarauskas](https://appshunter.io/developer/975306268) | [LONNIE DALE RAWLS](https://appshunter.io/developer/1858762647) |

## What reviewers say

### 4

[App page](https://appshunter.io/ios/app/4-20-temperature-calculator/id1602351736)

This utility app converts between 4-20 mA current signals and temperature readings. It's designed for engineers and technicians to quickly check transmitter scaling, verify loop values, and troubleshoot signal issues in various industrial applications.

**Highlights:** Two-way current to temperature conversion, Custom min/max process range, Support for negative temperatures, Celsius and Fahrenheit support, Fast and clean interface

**Features:** macOS Compatibility

**In-app purchases:** none


### I&C Tech Tools

[App page](https://appshunter.io/ios/app/i-and-c-tech-tools/id6756155332)

This app offers essential calculation tools for instrumentation and control technicians and engineers. It provides free access to basic tools, with advanced calculators available through a one-time in-app purchase or subscription.

**Highlights:** Basic instrumentation calculations, Free access to selected tools, Advanced calculators via in-app purchase, Practical reference tools, Ongoing improvements and updates

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| I&C Tech Tools - Monthly Access | $4.99 | per month |
| I&C Tech Tools - Yearly | $49.99 | per year |


## Frequently asked questions

### Is 4 free?

4 is free to download, with no in-app purchases.

### Is I&C Tech Tools free?

I&C Tech Tools is free to download, with in-app purchases available.

### Which has better reviews, 4 or I&C Tech Tools?

4 and I&C Tech Tools are both rated 3.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do 4 or I&C Tech Tools have ads?

Neither 4 nor I&C Tech Tools shows ads.

### Which is updated more often, 4 or I&C Tech Tools?

4 ships an update every 11 months, and I&C Tech Tools every 4 days. Most recently, 4 was updated on November 3, 2026 and I&C Tech Tools on October 30, 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.*