# SJVAir vs ForeCats

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.

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.

## The numbers

| Metric | SJVAir | ForeCats |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/sjvair/id6448961840/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 5 months |
| Monetization | Free | — |
| Size | 6 MB | 31 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Central California Asthma Collaborative](https://appshunter.io/developer/1687175572) | [masahiro takei](https://appshunter.io/developer/1798396295) |

## What reviewers say

### SJVAir

[App page](https://appshunter.io/ios/app/sjvair/id6448961840)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ForeCats

[App page](https://appshunter.io/ios/app/forecats/id6756996169)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SJVAir free?

SJVAir is free to download, with no in-app purchases.

### Is ForeCats free?

ForeCats is free to download, with no in-app purchases.

### Do SJVAir or ForeCats have ads?

ForeCats shows ads; SJVAir does not.

### Which is updated more often, SJVAir or ForeCats?

SJVAir ships an update monthly, and ForeCats every 5 months. Most recently, SJVAir was updated on November 3, 2026 and ForeCats on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*