# conV. vs 4

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.

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.

## The numbers

| Metric | conV. | 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/4-20-temperature-calculator/id1602351736/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 11 months |
| Monetization | — | Free |
| Size | 16 MB | 30 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HISANORI KAMEYAMA](https://appshunter.io/developer/683895276) | [Mantas Kamarauskas](https://appshunter.io/developer/975306268) |

## What reviewers say

### conV.

[App page](https://appshunter.io/ios/app/conv/id1393839146)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*