conV. vs 4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
conV.
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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。
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 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | conV. | 4 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 4 months — better | Every 11 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 16 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | HISANORI KAMEYAMA | Mantas Kamarauskas |
In-app purchases
conV.
No in-app purchases
4
No in-app purchases








