BelAir vs Celtix
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BelAir
Provides real-time and forecasted air quality scores across Belgium. It uses a comprehensive index based on various pollutants and offers insights into long-term air quality trends and health impacts.
- Real-time air quality scores
- Air quality forecasts
- Long-term air quality evolution
- BelAQI index explanation
- Pollutant concentration data
- Health impact insights
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BelAIR air quality app The BelAIR app gives a score, ranging from "very good" to "horrible", of the current air quality everywhere in Belgium. The app also makes a forecast of the air quality for the next few days and gives an idea of the long-term evolution of air quality. Measuring and modelling The three regions in Belgium have a network of more than 100 automatic measuring stations that measure the air quality very accurately. However, it is impossible to deploy these expensive devices everywhere. Using computer programmes, we calculate the air quality in places where no measurements are made. Together with the available measurements, an estimate of the air quality at each location in Belgium can then be made. BelAQI air quality index How good or bad the current air quality is depends on the concentrations of different substances in the air. The BelAQI air quality index is used to assess the air quality. It gives the air quality a rating from "very good" to "horrible". To calculate the BelAQI, the concentrations of various substances (nitrogen dioxide, particulate matter and ozone) are taken into account. For these substances, an individual assessment is made based on the short-term health effects. The worst assessed determines the overall BelAQI. Air quality in the long term The BelAIR app not only gives an idea of the day-to-day (or sometimes even hour-to-hour) variation in air quality at a location at the moment, but also gives an idea of the air quality in the long term. The annual average concentrations for a location are compared with the European limit values and the World Health Organisation's health advisory values. This gives an idea of the long-term impact of air pollution on health.
Celtix
Track your fitness activities, monitor progress, and access a vast library of 3D exercise demonstrations. This app helps you achieve your health goals with pre-made or custom workouts, motivating achievements, and integration with Apple Health.
- Track daily fitness activities
- Monitor weight and progress
- Access over 2000 3D exercise demonstrations
- Use pre-made or custom workouts
- Earn achievements
- Sync with Apple Health
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LET OP: JE HEBT EEN Celtix ACCOUNT NODIG OM IN TE LOGGEN IN DEZE APP. Sporten is nog leuker met onze Celtix Fitness app. Gratis te gebruiken voor al onze leden! De ideale App voor een fit én gezond leven. Bereik je doelen en blijf gemotiveerd met de nieuwe Celtix app. Houd je workouts en vooruitgang bij en laat ons je op weg helpen. Met de Celtix app kun je: De lesroosters en de openingstijden van jouw club bekijken Je dagelijkse fitnessactiviteiten bijhouden Je gewicht en andere statistieken invoeren en je voortgang bijhouden Duidelijke 3D demonstraties bekijken (er staan meer dan 2000 oefeningen in!) Vele kant-en-klare workouts gebruiken Zelf workouts samenstellen Meer dan 150 achievements verdienen Kies de workout die bij jou past en start met jouw ideale training: in de sportschool of thuis. Houd je fitnessprestaties bij van conditie tot kracht, van afvallen tot groepsles: deze App is jouw eigen Personal Trainer en geeft je de motivatie die je nodig hebt! Je kunt deze app syncen met de Apple Gezondheid App. Wanneer je deze connectie activeert, worden je workouts in de Gezondheid app automatisch toegevoegd aan je activiteitenkalender.
Screenshots
Verdict
The clearest difference is iOS requirement: Celtix at 8.0 against BelAir's 13.0. 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.
BelAir ships an update every 2 months, Celtix every 6 weeks. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.
| Parameter | BelAir | Celtix |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 12.2% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 60 MB | 119 MB |
| Age rating | 4+ | 12+ |
| Developer | Belgian Interregional Environment Agency (IRCEL - CELINE) | Celtix BVBA |
Customer experience
BelAir
Celtix
In-app purchases
BelAir
No in-app purchases
Celtix
No in-app purchases









