# Scent Diffuser vs 航记

The clearest difference is update cadence: 航记 at every 4 days against Scent Diffuser's every 2 weeks. Scent Diffuser's advantage is iOS requirement (15.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Scent Diffuser ships an update every 2 weeks, 航记 every 4 days. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Scent Diffuser | 航记 |
| --- | --- | --- |
| Price | **Free** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 91 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [ShenZhen Lenze Technology Co,.Ltd.](https://appshunter.io/developer/1190864538) | [Beijing Jitrace Technology Co., Ltd.](https://appshunter.io/developer/6786274445) |

## What reviewers say

### Scent Diffuser

[App page](https://appshunter.io/ios/app/scent-diffuser/id1578216698)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### 航记

[App page](https://appshunter.io/ios/app/id6786274443)

This app helps aviation professionals and enthusiasts manage flight schedules, duty periods, and flight memories. It offers tools for calculating duty times, handling time zone differences, and recording flight experiences with text, photos, and voice notes. The app also tracks flight history and provides reminders for important dates.

**Highlights:** Duty period calculation with compliance reminders, Time calculator for flight duration and time zones, Flight logbook with text, photo, and voice recording, Countdown and reminders for important dates, Flight map and travel footprint tracking, Flight and schedule recording, Apple ecosystem integration (Watch, widgets, iCloud)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Scent Diffuser free?

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

### Is 航记 free?

Pricing for 航记 is not currently listed on the App Store.

### Do Scent Diffuser or 航记 have ads?

Neither Scent Diffuser nor 航记 shows ads.

### Which is updated more often, Scent Diffuser or 航记?

Scent Diffuser ships an update every 2 weeks, and 航记 every 4 days. Most recently, Scent Diffuser was updated on October 14, 2026 and 航记 on October 16, 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.*