Be I/O

Air quality, made personal

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Be I/O makes sense of air quality in terms that apply to you. Rather than broad categories like "moderate" or "unhealthy," Be I/O estimates how much PM2.5 you'd actually take in, right now, doing what you're planning to do. Choose an activity — a 30-minute walk, or a 75-minute hard run — and see whether to Be Inside or Outside for it, and how much of your estimated daily intake it would account for. Be I/O works out your ventilation rate from optional health details: age and weight, or your resting and maximum heart rate, or — for the fitness nerds — the litres per minute you breathe in each heart rate zone, straight from a metabolic test. Connect to your own PurpleAir or AirGradient sensors over your local network for near-real-time readings, free and without an account. No sensor of your own? Subscribe to use the public monitor nearest you. A subscription adds: * Air quality from the sensor nearest you, wherever you are * What each run, ride and walk of the last 30 days cost you, from Apple Health * A week of sensor history (for public sensors) * The Apple Watch app: current air quality, your estimated breathing rate and PM2.5 intake, each optionally shown against a baseline you choose * A PM2.5 gauge Apple Watch complication Note: Be I/O estimates are fitted to adults; the app says so when it knows you're younger. Privacy Policy: https://be-io.app/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

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* Be I/O now supports indoor sensors (AirGradient and PurpleAir). Whether to Be Inside or Outside will use indoor readings if you have one, or else falls back to a rate of outdoors based on your home * A new watch complication shows the PM2.5 nearest you, or as a share of your personal daily guideline * Accessibility improvements * Profile tab is better organized, and shows details about your subscription * Adds support for devices running iOS 17 Plus a couple bugfixes: * Launching the app waits until it can find a sensor rather than showing "No reading yet" * Pull to refresh only refreshes the sensor you're viewing * Some AirGradient sensors couldn't be reached from the provided location ID

Version 1.1

The developer, Peter Compernolle, 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 Collected

    The developer does not collect any data from this app.

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

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Larger Text

      • Dark Interface

      • Differentiate Without Color Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    Seller
    • Peter Compernolle
    Size
    • 11.4 MB
    Category
    • Lifestyle
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    • Apple Watch
      Requires watchOS 11.0 or later.
    Languages
    • English
    Age Rating
    9+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Peter Compernolle
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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