# Ohm vs Radiator Calculator Pro

The clearest difference is price: Radiator Calculator Pro at Free against Ohm's $2.99. Ohm's advantage is in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 3 months). On ads and device support there is nothing between them.

Radiator Calculator Pro is free to download; Ohm costs $2.99 up front. Radiator Calculator Pro sells 1 one-off in-app purchase. Ohm asks for nothing beyond the download.

Ohm ships an update every 3 weeks, Radiator Calculator Pro every 3 months. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Ohm | Radiator Calculator Pro |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | — | Paid |
| Size | 6 MB | 16 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Eric Weil](https://appshunter.io/developer/1606923123) | [DigitalKind Ltd](https://appshunter.io/developer/1557937157) |

## What reviewers say

### Ohm

[App page](https://appshunter.io/ios/app/ohm-y/id6458875414)

**Features:** macOS Compatibility

**In-app purchases:** none


### Radiator Calculator Pro

[App page](https://appshunter.io/ios/app/radiator-calculator-pro/id6743349772)

Accurately calculate the heating requirements for any room in your home. This tool supports unlimited rooms, offers precise calculations in Watts and BTU, and features a clean, intuitive design with dark mode support.

**Highlights:** Calculate heating requirements, Support for all room types, Precise Watts and BTU output, Unlimited room saving, Intuitive user interface, Dark mode support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Radiator Calculator PRO | $3.99 | one-time |


## Frequently asked questions

### Is Ohm free?

Ohm costs $2.99, with no in-app purchases.

### Is Radiator Calculator Pro free?

Radiator Calculator Pro is free to download, with in-app purchases available.

### Do Ohm or Radiator Calculator Pro have ads?

Neither Ohm nor Radiator Calculator Pro shows ads.

### Which is updated more often, Ohm or Radiator Calculator Pro?

Ohm ships an update every 3 weeks, and Radiator Calculator Pro every 3 months. Most recently, Ohm was updated on October 25, 2026 and Radiator Calculator Pro on October 28, 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.*