Bullerkollen

Bullerkollen is an indicative sound level meter for iOS that turns your phone's built-in microphone into a practical measurement tool for noise, acoustics and vibration.

SOUND AND NOISE MEASUREMENT Measure with A- and C-weighting according to IEC 61672-1. The app calculates LAeq, LAFmax, LCeq, LCpeak, LASmax, LAFmin, L10, L50, L90 and LAE (SEL) in real time. Choose measurement duration (5–60 seconds) and save results with a name and notes.

1/3-OCTAVE SPECTRUM View A-weighted equivalent level per 1/3-octave band (20 Hz–16 kHz) in a clear bar chart. Perfect for identifying the frequency content of a noise source.

24-HOUR LOG Measure and log LAeq and LAFmax continuously for as long as you need — hours or entire nights. Choose resolution (1 second to 15 minutes) and export a PDF report directly in the app. Ideal for night-time measurements and longer monitoring sessions.

INDICATIVE INSULATION SCREENING Estimate the sound insulation of a wall or floor (DnT and R') as a single-number value according to ISO 717-1. Use a Bluetooth speaker as the source and measure in source and receiver rooms in five steps. Import reverberation time from Akustikkollen or enter manually.

VIBRATION METER Measure linear acceleration (m/s²) using the phone's accelerometer. Shows live RMS, measurement RMS per axis (X/Y/Z) and comfort class according to ISO 2631-1 — indicative screening of whole-body vibration.

CALIBRATION • Device profiles for known phone models (based on NIOSH data) • Calibration against a reference sound level meter • Manual dB offset • Support for external measurement microphones with calibration curve (.cal / .csv)

BBR COMPARISON Compare measurement results against Swedish Public Health Agency guidelines (FoHMFS 2014:13) for bedrooms and other rooms — directly after each measurement.

SAVE & EXPORT All measurement history is stored locally. Export individual measurements as CSV. 24-hour logs and insulation measurements export as PDF reports.

IMPORTANT Bullerkollen is an indicative meter and does not meet the requirements of SS-EN 61672-1 for Class 1 or Class 2 sound level meters. Do not use this app as the basis for regulatory reports or inspection protocols — use a calibrated meter and consult an acoustics professional when required.

Bullerkollen is developed by B&L Lund AB, a consulting firm specialised in acoustics, noise and vibration.