Comparison

airAlert vs Coach Stef

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

Head to head
About

airAlert

Features
Read full description

The airAlert app allows users to see forecast air pollution and cold levels in chosen areas on the south of England. The app also currently can show coldAlert levels as well. The service, provided by the Sussex Air Quality Partnership (Sussex-air), sends free messages direct to vulnerable people informing them about air pollution or cold levels in their area. airAlert is targeted at people with respiratory health problems who may be affected by air pollution or cold. airAlert warns people the day before or on the day that elevated air pollution is expected to occur. airAlert sends a voice,text message or notification direct to you (via your mobile or home telephone, email or by notification to the airAlert app or via webpages or RSS on your PC) Current the service covers 4 areas in the south of England (Sussex, Surrey, Sevenoaks and Southampton).

About

Coach Stef

Features
Read full description

Die neue Coach Stef App. Trainingsprogramme & Challenges Entdecke vielseitige Programme und Challenges, stelle dich neuen Herausforderungen und arbeite an deinen persönlichen Zielen. Einfache, aber wirkungsvolle Ernährung Kein Schnickschnack. Nur das, was wirklich zählt – alltagstauglich und nachhaltig. Tiefgreifende Analysen Behalte den Überblick über deine Performance, Schritte, Schlaf und vieles mehr – alles an einem Ort. Nahtlose Integrationen Verbinde Apple Health, Fitbit, Garmin, MyFitnessPal und weitere Plattformen für ein vollständiges Bild deiner Fitness. Synchronisiere die Daten mit der Health-App, um deine Werte sofort zu aktualisieren. Community Tritt gegen andere Mitglieder an, feiere Erfolge und lass dich von der Community mitreißen.

Screenshots

airAlert2 screens
Coach Stef4 screens

Verdict

The call

The clearest difference is update cadence: Coach Stef at every 3 weeks against airAlert's every 35 months. airAlert's advantage is iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

airAlert ships an update every 35 months, Coach Stef every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 4 level
airAlert versus Coach Stef: the parameters behind the verdict, then further details
ParameterairAlertCoach Stef
PriceFreeFree
Update frequencyEvery 35 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better13.0
Further details — not scored
Size29 MB418 MB
Age rating4+12+
DeveloperEnvironmental Research Group-King's College LondonOutperform Fitness & Marketing GmbH

In-app purchases

None

airAlert

No in-app purchases

None

Coach Stef

No in-app purchases

Questions

Is airAlert free?
airAlert is free to download, with no in-app purchases.
Is Coach Stef free?
Coach Stef is free to download, with no in-app purchases.
Do airAlert or Coach Stef have ads?
Neither airAlert nor Coach Stef shows ads.
Which is updated more often, airAlert or Coach Stef?
airAlert ships an update every 35 months, and Coach Stef every 3 weeks. Most recently, airAlert was updated on October 24, 2026 and Coach Stef on October 25, 2026.

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