London Air vs worldclock.today
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
London Air
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.
- Real-time pollution levels
- Interactive pollution maps
- Push notifications for high pollution
- Personalized 'My Sites' tracking
- Historical air quality statistics
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Know your air. This App displays the latest air pollution levels recorded at over 100 monitoring stations across greater London. Maps, My Sites and Push Notifications keep you up to date with London's air quality where you are. Push Notifications. Subscribe to a site to receive notifications when pollution levels change to Moderate or High. Maps. Hourly and annual 20 metre resolution interactive pollution maps give you an unparalleled view of air quality where you are. My Sites. Pin individual sites to the My Sites page for quick and easy access. Stats. See how a site has performed each year in relation to the air quality objectives. This application was designed by the Environmental Research Group at King's College London; London's leading air quality information and research group. This application is possible thanks to the continued support and participation of the boroughs of London in the London Air Quality Network.
worldclock.today
This app visualizes time zones by replacing clock hands with city names on a single dial. A white center indicates daytime and a dark outer ring signifies nighttime, allowing for quick understanding of global time and who is currently awake. It supports up to eight cities and works offline.
- Cities as clock hands
- Day/night indicator
- Real-time global time
- Supports up to 8 cities
- Offline functionality
- No account required
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The city is the hand. London at 4 o'clock means it's 4 PM there. Tokyo at 10 means 10 AM. City names replace clock hands on a single dial. They move in real time, just like hands would. White center = daytime. Dark outer ring = nighttime. One glance tells you the time in every city and who's awake right now. No lists. No math. No switching between clocks. Pick up to 8 cities. That's it. Built for remote teams, frequent travelers, and anyone tired of googling "what time is it in Dubai." Apple Watch, iPhone, iPad, Mac. No account. Works offline.
Screenshots
Verdict
The clearest difference is review sentiment: worldclock.today at 100% against London Air's 47%. London Air's advantage is iOS requirement (9.0 vs 16.0). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.
| Parameter | London Air | worldclock.today |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.0 (1 ratings) — better |
| Positive reviews | 46.9% of reviews | 100.0% of reviews — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 9.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 179 MB | 1 MB |
| Age rating | 12+ | 4+ |
| Developer | Environmental Research Group-King's College London | Luca Barberis |
Customer experience
London Air
worldclock.today
In-app purchases
London Air
No in-app purchases
worldclock.today
No in-app purchases
Questions
Is London Air free?
Is worldclock.today free?
Do London Air or worldclock.today have ads?
Which is updated more often, London Air or worldclock.today?
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