# Cereb IoT vs AirSize

The clearest difference is in-app purchases: Cereb IoT at none against AirSize's 1. Cereb IoT also leads on iOS requirement (11.0 vs 15.0). AirSize's advantage is update cadence (weekly vs every 12 months). On price, ads and device support there is nothing between them.

Both are free to download. AirSize sells 1 one-off in-app purchase. Cereb IoT asks for nothing beyond the download.

Cereb IoT ships an update every 12 months, AirSize weekly. The most recent releases landed on September 29, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Cereb IoT | AirSize |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Weekly** |
| Size | 42 MB | 8 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cereb Intelligence Limited](https://appshunter.io/developer/1442054685) | [孝龙 刘](https://appshunter.io/developer/1855768857) |

## What reviewers say

### Cereb IoT

[App page](https://appshunter.io/ios/app/cereb-iot/id6446927491)

**Features:** macOS Compatibility

**In-app purchases:** none


### AirSize

[App page](https://appshunter.io/ios/app/airsize/id6755718658)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 妙测 Pro | $0.99 | one-time |


## Frequently asked questions

### Is Cereb IoT free?

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

### Is AirSize free?

AirSize is free to download, with in-app purchases available.

### Do Cereb IoT or AirSize have ads?

Neither Cereb IoT nor AirSize shows ads.

### Which is updated more often, Cereb IoT or AirSize?

Cereb IoT ships an update every 12 months, and AirSize weekly. Most recently, Cereb IoT was updated on September 29, 2026 and AirSize on October 9, 2026.

---

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