# airx智能 vs Scent Memo

The clearest difference is price: airx智能 at Free against Scent Memo's $0.99. airx智能 also leads on iOS requirement (14.0 vs 17.0). Scent Memo's advantage is update cadence (every 5 weeks vs every 19 months) and chart position (#199 vs unranked). On ads, in-app purchases and device support there is nothing between them.

airx智能 is free to download; Scent Memo costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

airx智能 ships an update every 19 months, Scent Memo every 5 weeks. The most recent releases landed on October 23, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | airx智能 | Scent Memo |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 5 weeks** |
| Best chart rank | — | **#199** |
| Size | 218 MB | 7 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Beijing AIERSHI Technology Co., Ltd](https://appshunter.io/developer/1625854625) | [骏豪 马](https://appshunter.io/developer/6784085669) |

## What reviewers say

### airx智能

[App page](https://appshunter.io/ios/app/airx/id1625854623)

**Features:** macOS Compatibility

**In-app purchases:** none


### Scent Memo

[App page](https://appshunter.io/ios/app/scent-memo/id6784158541)

**Currently charting:** #199 Top Paid · Lifestyle (US App Store)

**In-app purchases:** none


## Frequently asked questions

### Is airx智能 free?

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

### Is Scent Memo free?

Scent Memo costs $0.99, with no in-app purchases.

### Do airx智能 or Scent Memo have ads?

Neither airx智能 nor Scent Memo shows ads.

### Which is updated more often, airx智能 or Scent Memo?

airx智能 ships an update every 19 months, and Scent Memo every 5 weeks. Most recently, airx智能 was updated on October 23, 2026 and Scent Memo on September 23, 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.*