Meter and Halo
Read the current, minimum, average, maximum, and peak levels with a clear Halo, weighting choices, LAeq, and plain-language context.
Private sound awareness
Understand the sound around you
dB Halo turns your iPhone, iPad, and Apple Watch into an approachable sound-level companion. See the current level at a glance, explore live frequency detail, estimate noise exposure, and keep useful records—all with on-device processing.
- No account
- No ads or tracking
- On-device audio processing
- One-time Lifetime Pro
What dB Halo does
Simple at first glance, detailed when you need it
Spectrum, RTA, and spectrogram
Inspect frequency energy through synchronized FFT, octave-band RTA, and spectrogram views without breaking the active analysis session.
Noise dose
Follow estimated exposure, remaining time, and NIOSH or OSHA guidance. The result is informational, not a workplace compliance decision.
Sleep sound events
Log recognized event categories, their times, and sound levels on the device. Sleep mode does not save raw audio.
History and exports
Keep local history and calibration profiles, then create user-requested CSV, PDF, AAC, photo, or video outputs when a supported workflow calls for them.
Watch, widgets, and shortcuts
Use the dedicated Apple Watch experience, glanceable widgets, and App Intents while the paired devices share only the local data needed for each action.
01
Quick start
- Open Meter and allow microphone access when iOS asks.
- Place the device where it will not be covered or rubbing against clothing, then tap Start.
- Use the Halo and current dB value for a quick reading; open Spectrum or Dose when you need more detail.
- Tap Stop before leaving the workflow, then save the result to History if you want to keep it.
02
Permissions stay under your control
- Microphone access is required for sound measurement and analysis. Raw Meter, Spectrum, and Dose audio is processed in memory and not saved.
- Photos and videos are accessed only after you choose specific items through the system Photos picker; dB Halo processes those selected items locally.
- Health access is optional. With permission, dB Halo writes environmental audio exposure samples and does not read Health data.
03
Lifetime Pro and Restore
Lifetime Pro is a single non-consumable purchase, not a subscription. The App Store shows the localized price before you confirm. To restore an earlier purchase, open dB Halo → Settings → Lifetime Pro → Restore Purchases and use the same Apple Account that bought it.
04
Troubleshooting
- No reading: confirm microphone permission in iOS Settings, disconnect an unintended audio route, and make sure another app is not occupying the microphone.
- Unexpected values: remove any case or obstruction near the microphone, avoid handling noise, select the intended input, and review your calibration profile.
- Watch or widget looks old: keep the iPhone and Watch paired and nearby, open dB Halo on the iPhone once, then allow the system a moment to refresh.
- Purchase not restored: verify that the device is online, use the original Apple Account, and run Restore Purchases again from Lifetime Pro.
Important measurement note
An informed estimate, not a certified instrument
Phone and watch microphones vary by model, placement, case, environment, and calibration. dB Halo is useful for awareness and personal records, but it is not a certified sound-level meter and does not replace medical advice, hearing assessment, occupational hygiene monitoring, or a legally required workplace instrument.
Need more help?
Contact dB Halo support
Include your device model, iOS or watchOS version, the screen or feature involved, and what you expected to happen. Please do not attach private recordings, photos, health information, or export files unless they are essential to your request.