# F vs Calotech

The clearest difference is price: Calotech at Free against F's $2.99. Calotech also leads on in-app purchases (none vs 4). F's advantage is update cadence (every 4 weeks vs every 2 months) and iOS requirement (12.0 vs 16.0). On ads and device support there is nothing between them.

Calotech is free to download; F costs $2.99 up front. F sells 4 one-off in-app purchases. Calotech asks for nothing beyond the download.

F ships an update every 4 weeks, Calotech every 2 months. The most recent releases landed on October 13, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | F | Calotech |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Paid | — |
| Size | 30 MB | 27 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Radu Dominte](https://appshunter.io/developer/1242111237) | [Calorie Fluor](https://appshunter.io/developer/1693605712) |

## What reviewers say

### F

[App page](https://appshunter.io/ios/app/f-gas-tool/id1242111238)

This tool calculates the Global Warming Potential (GWP) of greenhouse gases, aiding compliance with EU regulations. It helps track gas inventory, calculate leak detection frequency, and manage gas phase-out and retrofitting. The app also provides gas composition and flammability data.

**Highlights:** GWP calculation for greenhouse gases, Leak detection frequency calculation, Gas phase-out and retrofit management, Cloud-based Gas Manager for inventory tracking, Gas composition and flammability data, Supports multiple languages

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ads Removal | $0.99 | one-time |
| +30 Gas Insertions | $0.99 | one-time |
| +60 Gas Insertions | $1.99 | one-time |
| +120 Gas Insertions | $3.99 | one-time |


### Calotech

[App page](https://appshunter.io/ios/app/calotech/id6450924301)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is F free?

F costs $2.99, and also offers in-app purchases.

### Is Calotech free?

Calotech is free to download, with no in-app purchases.

### Do F or Calotech have ads?

Neither F nor Calotech shows ads.

### Which is updated more often, F or Calotech?

F ships an update every 4 weeks, and Calotech every 2 months. Most recently, F was updated on October 13, 2026 and Calotech on October 27, 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.*