Comparison

Clean Air in Cities vs Whenn

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Clean Air in Cities

This app provides real-time air quality data, including PM2.5 and ozone levels, and forecasts for your location. It illustrates the health impact of air pollution on populations and offers daily notifications.

Highlights
  • Real-time PM2.5 and ozone concentrations
  • Daily air pollution forecast notifications
  • Population health impact assessment
  • Short-term and long-term exposure alerts
  • WHO guideline-based alert bands
Features
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The App illustrates the health impact of short and long-term exposure to air pollution on populations as a whole and offers daily forecast notifications. It shows concentrations of dangerous airborne particles (PMโ‚‚.โ‚…) and ozone (Oโ‚ƒ) for the latest hour at your current location from the OpenWeather service together with our Air Pollution Alert Index for short-term exposure over the last and next 24 hours. The App also estimates the number of deaths attributable to long-term exposure to air pollution in England on a pro rata, calendar year-to-date basis and the time to the next attributable death as well as displaying the percentage of total deaths attributable to air pollution. It does not estimate or display the risk for an individual or the number of actual deaths from air pollution. Users can also see estimates of total population-weighted exposure to annual average concentrations of PMโ‚‚.โ‚… in different local areas and/or regions in England. The alert bands for short and long-term exposure to air pollution are based on Clean Air in London's interpretation of the World Health Organisation's air quality guidelines published in September 2021.

About

Whenn

Features
Read full description

Note and share the companies you use with your next of kin. Order the paper pack and download the app. Use the start button to quickly enter the companies you use for your home and the banks, insurers and pension providers you use. No passwords, logins or account numbers. Once you've completed your Lists, share with next of kin. Edit and update as you switch providers or move home.

Screenshots

Clean Air in Cities4 screens
Whenn4 screens

Verdict

The call

The clearest difference is update cadence: Whenn at every 8 days against Clean Air in Cities's every 3 weeks. Whenn also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

Clean Air in Cities ships an update every 3 weeks, Whenn every 8 days. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

Scorecard2 real differences ยท 6 level
Clean Air in Cities versus Whenn: the parameters behind the verdict, then further details
ParameterClean Air in CitiesWhenn
PriceFreeFree
Positive reviews100.0% of reviewsโ€”
Update frequencyEvery 3 weeksEvery 8 days โ€” better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeโ€”
DevicesiPhone, iPad, Apple Watch โ€” betteriPhone, iPod
Requires iOS17.015.1 โ€” better
Further details โ€” not scored
Size30 MB21 MB
Age rating4+17+
DeveloperClean Air in LondonWhenn Limited

In-app purchases

None

Clean Air in Cities

No in-app purchases

None

Whenn

No in-app purchases

Questions

Is Clean Air in Cities free?
Clean Air in Cities is free to download, with no in-app purchases.
Is Whenn free?
Whenn is free to download, with no in-app purchases.
Do Clean Air in Cities or Whenn have ads?
Neither Clean Air in Cities nor Whenn shows ads.
Which is updated more often, Clean Air in Cities or Whenn?
Clean Air in Cities ships an update every 3 weeks, and Whenn every 8 days. Most recently, Clean Air in Cities was updated on October 23, 2026 and Whenn on October 25, 2026.

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