# Temperature Converter vs 4

The clearest difference is rating: Temperature Converter at 4.8 against 4's 3.0. Temperature Converter also leads on ratings volume (6.3K vs 2). 4's advantage is in-app purchases (none vs 3). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Temperature Converter sells 3 one-off in-app purchases. 4 asks for nothing beyond the download.

Temperature Converter holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Temperature Converter has 6.3K ratings behind it against 2, so its average is the more settled of the two.

Temperature Converter ships an update every 6 months, 4 every 11 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Temperature Converter | 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6.3K ratings)](https://appshunter.io/ios/app/temperature-converter/id449608609/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/4-20-temperature-calculator/id1602351736/reviews) |
| Number of ratings | **6.3K** | 2 |
| Positive reviews | 91.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 11 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 11 MB | 30 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [Mantas Kamarauskas](https://appshunter.io/developer/975306268) |

## What reviewers say

### Temperature Converter

[App page](https://appshunter.io/ios/app/temperature-converter/id449608609)

Easily convert temperatures between Celsius, Fahrenheit, and Kelvin with a clean and intuitive interface. This utility app offers quick and accurate conversions for everyday use. Ads are present but can be removed via a one-time purchase.

**Highlights:** Celsius conversion, Fahrenheit conversion, Kelvin conversion, User-friendly interface, Ad removal option

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Reduced | $0.99 | one-time |
| Upgrade | $1.99 | one-time |
| Upgrade Hero | $3.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Accurate and fast conversions
- 💡 Useful for international communication
- 🚀 Excellent app for the job
- 👍 Straightforward and effective

**What reviewers complain about**

- 🔍 Needs more customization options
- 💰 Too many ads
- 🔍 Inaccurate temperature calculations

**Reported bugs**

- Inaccurate Kelvin temperature conversions
- Occasional crashes or freezes

**Requested features**

- Add Rankine temperature scale
- Increase font size for better readability
- Provide color customization options


### 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 Temperature Converter free?

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

### Is 4 free?

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

### Which has better reviews, Temperature Converter or 4?

Temperature Converter is rated higher. Temperature Converter averages 4.8 out of 5 from 6.3K ratings, while 4 averages 3.0 from 2 ratings.

### Do Temperature Converter or 4 have ads?

Neither Temperature Converter nor 4 shows ads.

### Which is updated more often, Temperature Converter or 4?

Temperature Converter ships an update every 6 months, and 4 every 11 months. Most recently, Temperature Converter was updated on November 6, 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.*