# London Air vs PrepTracker

The clearest difference is review sentiment: PrepTracker at 100% against London Air's 47%. PrepTracker also leads on update cadence (every 2 days vs every 2 months). London Air's advantage is iOS requirement (9.0 vs 15.5). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

London Air ships an update every 2 months, PrepTracker every 2 days. The most recent releases landed on November 1, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | London Air | PrepTracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/preptracker-emergency-prep/id6790476379/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 46.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 179 MB | 31 MB |
| Requires iOS | **9.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Environmental Research Group-King's College London](https://appshunter.io/developer/358970520) | [Cubed Holdings LLC](https://appshunter.io/developer/6790476382) |

## What reviewers say

### London Air

[App page](https://appshunter.io/ios/app/london-air/id358970517)

Monitor air pollution in London with real-time data from over 100 stations. Get interactive maps, personalized site tracking, and push notifications for moderate or high pollution levels. Understand historical air quality trends and objectives.

**Highlights:** Real-time pollution levels, Interactive pollution maps, Push notifications for high pollution, Personalized 'My Sites' tracking, Historical air quality statistics

**Features:** macOS Compatibility

**In-app purchases:** none


### PrepTracker

[App page](https://appshunter.io/ios/app/preptracker-emergency-prep/id6790476379)

This app helps households prepare for emergencies by tracking essential supplies, identifying gaps, and providing step-by-step guides. It offers features like emergency contact lists, evacuation plans, and real-time alerts for local hazards. The app prioritizes privacy with no ads or account requirements.

**Highlights:** Supply inventory and readiness tracking, Prioritized shopping lists, Emergency contact and medical information, Family planning and evacuation routes, Live hazard alerts and seasonal warnings, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is London Air free?

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

### Is PrepTracker free?

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

### Do London Air or PrepTracker have ads?

Neither London Air nor PrepTracker shows ads.

### Which is updated more often, London Air or PrepTracker?

London Air ships an update every 2 months, and PrepTracker every 2 days. Most recently, London Air was updated on November 1, 2026 and PrepTracker on November 10, 2026.

---

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