Comparison

conV. vs 4

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

Head to head
About

conV.

Features
Read full description

概要+++++++++++++++++++++++++++++++ 天気予報などで、 「明日は風速20m/sの強風が吹くでしょう」と、 よく言われます。 しかし、風速20m/sと言われても、 どのくらいの風速なのか なかなかピンとこないものです。 また、大リーグの放送を見ていて、 ピッチャーが投げたボールの速度が 95mileと言われて、 時速でないと感動も一歩遅れてしまうもの。 そんな時、このアプリ「Convert」を お使いください。 よく使う単位の変換から、 あまりお目にかからない単位の変換まで、 このアプリにおまかせください。 操作方法++++++++++++++++++++++++++ アプリを起動するとすぐに、 各単位変換の選択画面が表示されます。 その中から目的の単位変換を選択してください。 各単位変換画面では、 1.変換元となる数値を入力し、 2.その数値の単位を選択し、 3.画面下部の変換ボタンをタップ してください。 なお、数値入力時には、数値以外が入力された場合、 再度正しい数値を入力するメッセージが表示されます。

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

conV.4 screens
43 screens

Verdict

The call

The clearest difference is ads: 4 at none against conV.'s shown. conV.'s advantage is update cadence (every 4 months vs every 11 months) and iOS requirement (12.0 vs 15.6). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

conV. ships an update every 4 months, 4 every 11 months. The most recent releases landed on October 12, 2026 and September 29, 2026 respectively.

Scorecard3 real differences · 6 level
conV. versus 4: the parameters behind the verdict, then further details
ParameterconV.4
PriceFreeFree
Rating—3.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 4 months — betterEvery 11 months
AdsYesNo — better
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.6
Further details — not scored
Size16 MB30 MB
Age rating4+4+
DeveloperHISANORI KAMEYAMAMantas Kamarauskas

In-app purchases

None

conV.

No in-app purchases

None

4

No in-app purchases

Questions

Is conV. free?
conV. is free to download, with no in-app purchases.
Is 4 free?
4 is free to download, with no in-app purchases.
Do conV. or 4 have ads?
conV. shows ads; 4 does not.
Which is updated more often, conV. or 4?
conV. ships an update every 4 months, and 4 every 11 months. Most recently, conV. was updated on October 12, 2026 and 4 on September 29, 2026.

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