# CM PM2.5 vs fireDNPX

The clearest difference is update cadence: fireDNPX at weekly against CM PM2.5's every 3 weeks. CM PM2.5's advantage is iOS requirement (11.0 vs 17.6). On price, ads, 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, fireDNPX weekly. The most recent releases landed on September 13, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | CM PM2.5 | fireDNPX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 33 MB | 4 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chakrit Chotamonsak](https://appshunter.io/developer/1208089430) | [Natthanon Chaiyasak](https://appshunter.io/developer/934772605) |

## What reviewers say

### CM PM2.5

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

**Features:** macOS Compatibility

**In-app purchases:** none


### fireDNPX

[App page](https://appshunter.io/ios/app/firednpx/id6505078314)

**Features:** macOS Compatibility

**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 fireDNPX free?

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

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

Neither CM PM2.5 nor fireDNPX shows ads.

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

CM PM2.5 ships an update every 3 weeks, and fireDNPX weekly. Most recently, CM PM2.5 was updated on September 13, 2026 and fireDNPX on September 8, 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.*