Paku | Air Quality App 4+

Real-time AQI from PurpleAir

Pitou Technologies, LLC

    • 4.8 • 173 Ratings
    • Free
    • Offers In-App Purchases


Paku is the best app for PurpleAir, allowing you quickly check air quality and more:

→ Best-in-Class Air Quality Monitoring
Paku is fast and lightweight. View hyperlocal, real-time air quality, temperature and humidity from PurpleAir sensors, and enable AirNow stations for additional information.

→ Gorgeous and Versatile Widgets
Configure widgets to show you the nearest sensor, any public sensor, or your own private sensor. Widgets are available for your Home Screen, Lock Screen, Apple Watch, and Mac Desktop.

→ Real-time Air Quality Alerts
Configure alerts for sensors and get real-time push notifications when the AQI exceeds your specified threshold - and when it improves. Whether you live somewhere with frequent wildfires or strong inversions, these notifications can be invaluable.

→ Private Sensors
Add your private sensors to Paku, and view them on the map, in widgets, or use them with alerts.

→ iCloud Sync
Paku is available on iPhone, Apple Watch, iPad, and Mac for seamless monitoring wherever you are. Your favorites and settings sync to all your devices.

→ Privacy First Design
Your location never leaves the app, and Paku collects no personal information.

What’s New

Version 5.3.7

→ Fixes an issue with chart scaling that was especially obvious at lower values.
→ Fixes an issue where the current value for the data point in a chart was not always shown in the chart.
→ AQI charts with small ranges will now have smoother curves.
→ Fixes an issue where charts could display inaccurate AQI values for indoor sensors.
→ Fixes an issue where sensors reporting a low confidence would appear offline if “Hide Inaccurate Sensors” was enabled.

Ratings and Reviews

4.8 out of 5
173 Ratings

173 Ratings

Mike276437832 ,

Atmospheric chemist here, this is a pretty good app

Good connectivity and the widget apps for the pro option are very nice. Interface is very user friendly and the updates are quite quick. The ~$1/month membership for an annual price seems very fair. I think my colleagues and I would really enjoy seeing an option to display both PM 1 and PM 2.5 data (especially as a widget option!). Purple air offers this publicly but AQI tends to be the preferred public option for good reason. I think as indoor air quality becomes more prevalent as an issue, things will get more nuanced.

Usage of indoor air quality sensors have been increasing quite rapidly, the new IKEA ones are going to further this even more. In one of our recent papers, I think the number of indoor sensors doubled every two years. I would suggest looking to eventually incorporate a user friendly page on the app (or as a widget) that can incorporate multiple air sensors in one location (outdoor, kitchen, bedroom, etc). And possibly even other sensor companies. Very nice app! Great job on it.

@Magnuson ,

Finally an app to view PurpleAir data!

I love how Paku lets me avoid the clunky PurpleAir website. The app is wonderfully simple and looks good.

However, the app is a little too simple. For example, the app never refreshes data. If I leave the app open and want to see the current air quality, I have to quit and relaunch the app. Ideally the app would refresh data automatically every 5-10 minutes. However, a manual refresh option is an absolute requirement for an app like this. Having to quit and relaunch the app just to refresh the data available is super obtuse and cumbersome.

Another issue is that PurpleAir sensors grab lots more data than only the AQI. I find PurpleAir sensors even more useful for their temperature readings than their AQI readings. The sensor saturation is so high in the San Francisco Bay Area that they make it really easy to see what all the microclimates are like around the bay. I can then use this to plan my outdoor activities. It would be fantastic if Paku allowed us to view temperature data from PurpleAir sensors.

All said, it's fantastic that Paku exists at all. I'd gladly pay $10 for this app as it exists today. Add auto-refresh and temperature data and I'd more than willingly pay $20. This app has huge value potential for my daily life. I hope to see it reach that potential one day.

Developer Response ,

Thanks for the great feedback! Since your review, the app has had all the features you've requested added. Hopefully you find it useful - I would really appreciate an updated rating if you have time!

Nickscave ,

Everything I want for air quality monitoring

Seriously impressed by this app. It’s the perfect companion to my PurpleAir outdoor sensor.

With the addition today of subscription push alerts when air quality exceeds a defined level at a sensor, I’m struggling to think of any other features that I’m really missing. The quality of the app easily justifies the small subscription cost. I love the widgets on my Lock Screen too.

The only missing feature that springs to mind is a list view of sensors rather than the map view. The map view is great for panning around my area but I have family and friends spread around the country and it would be nice to see air quality/temp/humidity for a list of locations at a glance.

Developer Response ,

Thank you so much for your wonderful review! A favorites list would be a great addition, I'll look into that.

Update: you can now add sensors as favorites, and view your favorites in a list!

App Privacy

The developer, Pitou Technologies, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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