# Flow vs Clairsense

The clearest difference is in-app purchases: Flow at none against Clairsense's 1. Clairsense's advantage is iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Clairsense sells 1 in-app purchase, starting at $29.99 per year. Flow asks for nothing beyond the download.

Flow ships an update monthly, Clairsense every 3 weeks. The most recent releases landed on August 15, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Flow | Clairsense |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (27 ratings)](https://appshunter.io/ios/app/flow-air-pollution-sensor/id1332618814/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 19.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 69 MB | 81 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Plume Labs](https://appshunter.io/developer/950289242) | [ARTEQ ARGE VE MUHENDISLIK LIMITED SIRKETI](https://appshunter.io/developer/1662256239) |

## What reviewers say

### Flow

[App page](https://appshunter.io/ios/app/flow-air-pollution-sensor/id1332618814)

This app visualizes air quality data collected by a personal sensor. It helps users understand their exposure to pollutants like PM2.5, PM10, NO2, and VOCs, offering insights to find cleaner air routes and identify pollution hotspots.

**Highlights:** Real-time pollution tracking (PM2.5, PM10, NO2, VOCs), Personal exposure reports, Air Quality Index (AQI) monitoring, Clean air route finding, Pollution hotspot identification, Daily and live data analysis

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

**In-app purchases:** none


### Clairsense

[App page](https://appshunter.io/ios/app/clairsense/id6470394555)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clairsense Pro | $29.99 | per year |


## Frequently asked questions

### Is Flow free?

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

### Is Clairsense free?

Clairsense is free to download, with in-app purchases available.

### Do Flow or Clairsense have ads?

Neither Flow nor Clairsense shows ads.

### Which is updated more often, Flow or Clairsense?

Flow ships an update monthly, and Clairsense every 3 weeks. Most recently, Flow was updated on August 15, 2026 and Clairsense on September 16, 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.*