airAlert vs Coach Stef
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
airAlert
Read full descriptionHide 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).
Coach Stef
Read full descriptionHide 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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | airAlert | Coach Stef |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 35 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 29 MB | 418 MB |
| Age rating | 4+ | 12+ |
| Developer | Environmental Research Group-King's College London | Outperform Fitness & Marketing GmbH |
In-app purchases
airAlert
No in-app purchases
Coach Stef
No in-app purchases









