SJVAir vs ForeCats
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SJVAir
Track your local air quality in real-time with hourly PM2.5 concentration data. Receive outdoor activity guidelines and get live notifications when air quality becomes hazardous. Explore a monitor map and view historical data.
- Real-time air quality monitoring
- Hourly PM2.5 concentration data
- Outdoor activity guidelines
- Hazardous air notifications
- Monitor map with historical data
- Data download for analysis
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Monitor your local air quality in real time! Keep any eye on your local air quality and receive outdoor activity guidelines based on hourly fine particle pollution (PM2.5) concentration. Going out for the day? Enable "Auto Update" in the app's settings menu and get live notifications when you enter hazardous air! Take advantage of real time data with SJVAir's Monitor Map. Utilize the full SJVAir monitor network, as well as viewing AirNow and other PurpleAir monitors that have been deployed in the San Joaquin Valley. View past trends and historical data for every monitor on the map, or download the data to start making your own analysis and infographics!
ForeCats
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A charming cat clock that tells time and feels the weather. This is a simple clock app that shows the current time and the weather at your location — but with a twist. The weather forecast comes from a cat, so please don’t rely on it too much. When rain might be coming, the cat may start washing its face. On sunny days, the cat relaxes and looks happy. Instead of numbers and charts, you can sense today’s weather through the cat’s little behaviors. Inspired by the old saying, “When a cat washes its face, it may rain.” This app is not about accuracy. It’s about enjoying time and weather in a gentle, playful way — together with a cat.
Screenshots
Verdict
The clearest difference is ads: SJVAir at none against ForeCats's shown. SJVAir also leads on update cadence (monthly vs every 5 months). ForeCats's advantage is iOS requirement (13.0 vs 15.0). On price, 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.
SJVAir ships an update monthly, ForeCats every 5 months. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.
| Parameter | SJVAir | ForeCats |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Monthly — better | Every 5 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Central California Asthma Collaborative | masahiro takei |
In-app purchases
SJVAir
No in-app purchases
ForeCats
No in-app purchases









