# CM PM2.5 vs F

The clearest difference is ads: CM PM2.5 at none against F's shown. CM PM2.5 also leads on iOS requirement (11.0 vs 17.0). On price, update cadence, 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.

CM PM2.5 ships an update every 3 weeks, F every 2 weeks. The most recent releases landed on October 27, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | CM PM2.5 | F |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 33 MB | 220 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chakrit Chotamonsak](https://appshunter.io/developer/1208089430) | [TRUE CORPORATION PUBLIC COMPANY LIMITED](https://appshunter.io/developer/447041660) |

## What reviewers say

### CM PM2.5

[App page](https://appshunter.io/ios/app/cm-pm25/id1630179097)

**Features:** macOS Compatibility

**In-app purchases:** none


### F

[App page](https://appshunter.io/ios/app/f-secure-for-true/id6738036244)

**Features:** Safari Extension

**In-app purchases:** none


## Frequently asked questions

### Is CM PM2.5 free?

CM PM2.5 is free to download, with no in-app purchases.

### Is F free?

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

### Do CM PM2.5 or F have ads?

F shows ads; CM PM2.5 does not.

### Which is updated more often, CM PM2.5 or F?

CM PM2.5 ships an update every 3 weeks, and F every 2 weeks. Most recently, CM PM2.5 was updated on October 27, 2026 and F on October 26, 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.*