Comparison

Temperature Converter vs 4

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Celsius conversion
  • Fahrenheit conversion
  • Kelvin conversion
  • User-friendly interface
  • Ad removal option
Features
Read full description

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.

About

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.

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
Read full description

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

Temperature Converter4 screens
43 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Temperature Converter versus 4: the parameters behind the verdict, then further details
ParameterTemperature Converter4
PriceFreeFree
Rating4.8 (6.3K ratings) — better3.0 (2 ratings)
Positive reviews91.5% of reviews—
Number of ratings6.3K — better2
Update frequencyEvery 6 months — betterEvery 11 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size11 MB30 MB
Age rating4+4+
DeveloperArmchair EngineeringMantas Kamarauskas

Customer experience

Temperature Converter

All ratings6,260 ratings
Positive95.8%
Neutral2.7%
Negative1.6%
Written reviews47 reviews
Positive91.5%
Neutral2.1%
Negative6.4%

4

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

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

3 purchases

Temperature Converter

One-time3
  • Upgrade Reduced$0.99
  • Upgrade$1.99
  • Upgrade Hero$3.99
None

4

No in-app purchases

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 1, 2026 and 4 on November 3, 2026.

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