# JUMO Device vs 4

The clearest difference is update cadence: JUMO Device at every 3 months against 4's every 11 months. JUMO Device also leads on iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

JUMO Device ships an update every 3 months, 4 every 11 months. The most recent releases landed on October 26, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | JUMO Device | 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/4-20-temperature-calculator/id1602351736/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 11 months |
| Monetization | — | Free |
| Size | 4 MB | 30 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JUMO GmbH & Co. KG](https://appshunter.io/developer/1023671932) | [Mantas Kamarauskas](https://appshunter.io/developer/975306268) |

## What reviewers say

### JUMO Device

[App page](https://appshunter.io/ios/app/jumo-device/id1023671933)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is JUMO Device free?

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

### Is 4 free?

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

### Do JUMO Device or 4 have ads?

Neither JUMO Device nor 4 shows ads.

### Which is updated more often, JUMO Device or 4?

JUMO Device ships an update every 3 months, and 4 every 11 months. Most recently, JUMO Device was updated on October 26, 2026 and 4 on November 3, 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.*