Temperature Converter vs 4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Temperature Converter
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.
- Celsius conversion
- Fahrenheit conversion
- Kelvin conversion
- User-friendly interface
- Ad removal option
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A striking & user-friendly temperature converter! Quickly convert temperatures between Celsius, Fahrenheit & Kelvin. Ad Supported. Ads can be removed with a one-time in-app purchase.
4
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.
- Two-way current to temperature conversion
- Custom min/max process range
- Support for negative temperatures
- Celsius and Fahrenheit support
- Fast and clean interface
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4-20 Temperature Calculator is a practical tool for engineers, technicians, and field service professionals working with 4-20 mA transmitters. Use it to quickly convert: • 4-20 mA to temperature • Temperature to 4-20 mA The app helps you work faster in the field by giving you a simple and accurate way to check transmitter scaling, verify loop values, and troubleshoot signal readings. Key features: • Two-way conversion between current and temperature • Custom min/max process range • Support for negative temperature ranges • Celsius and Fahrenheit input/output • Fast, clean interface for everyday use • Useful for HVAC, process control, maintenance, and commissioning work Whether you are calibrating a transmitter, checking a loop, or validating process values, 4-20 Temperature Calculator gives you the numbers you need in seconds.
Screenshots
Verdict
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.
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. 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 1, 2026 and November 3, 2026 respectively.
| Parameter | Temperature Converter | 4 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (6.3K ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 91.5% of reviews | — |
| Number of ratings | 6.3K — better | 2 |
| Update frequency | Every 6 months — better | Every 11 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 11 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Armchair Engineering | Mantas Kamarauskas |
Customer experience
Temperature Converter
4
Bugs and requests
Temperature Converter
Reported bugs
2 issues- Inaccurate Kelvin temperature conversions
- Occasional crashes or freezes
Requested features
3 requests- Add Rankine temperature scale
- Increase font size for better readability
- Provide color customization options
4
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Temperature Converter
- Upgrade Reduced$0.99
- Upgrade$1.99
- Upgrade Hero$3.99
4
No in-app purchases
Questions
Is Temperature Converter free?
Is 4 free?
Which has better reviews, Temperature Converter or 4?
Do Temperature Converter or 4 have ads?
Which is updated more often, Temperature Converter or 4?
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