SPL Reference

Sound level meter & analysis

Only for iPhone

Free · In‑App Purchases

iPhone

See how bass changes across your room. Room Map reveals relative high and low pressure zones to help refine your Hi-Fi setup. Included with Lifetime Professional. Hear your system. See your room. SPL Reference combines sound-level measurement with Room Map, a new way for Hi-Fi enthusiasts to explore how bass changes across a listening room. Measure at several positions and see areas of relatively high and low sound pressure at the selected frequency, helping you investigate uneven bass and make more informed speaker and listening-position choices. EXPLORE YOUR LISTENING ROOM • Create a rectangular room and follow a guided 9- or 12-point survey, or customise your measurement positions. • Explore frequency-selectable heatmaps with 1/12- or 1/3-octave bands. • Use generated bass pink noise through your playback system, or a stable external pink-noise source. • Review individual points, capture-quality notes and a repeat measurement at the reference position. • Save maps in Sessions, organise them in projects and export the survey data. A COMPANION TO ROOM REFERENCE Use SPL Reference alongside the separately available Room Reference app to add measured spatial bass comparisons to your room investigation. We are working to integrate the two apps; direct integration is not included in this release. MEASURE WITH CONTEXT • Live A-, C- and Z-weighted measurements • Fast, Slow and Impulse time responses • LAeq, LAFmax, LCpeak and time-history views • Pause, resume, event markers and integrity evidence • Clear distinction between indicative readings and reference-calibrated chains ANALYSE AND DOCUMENT • 1/1- and 1/3-octave frequency analysis, spectrum and spectrogram history • Statistical exceedance levels from L1 to L99 • Noise-exposure assessment using NIOSH, OSHA and configurable models • Projects, notes, photographs and optional location evidence • Microphone profiles, acoustic calibration records and drift checks • Professional PDF reports for ordinary sound-level measurements Browse the public measurement archive from inside the app. Measurements are never uploaded automatically. START FREE. UPGRADE ONCE. The free tier includes the built-in microphone, five active measurement minutes per calendar month, two saved measurements and one project. Room Map and advanced features require Lifetime Professional Unlock, which removes the free limits with one purchase and no subscription. Room Map is included for existing Lifetime Professional owners. ABOUT YOUR RESULTS Room maps show the combined response of your speakers and room at one microphone height. Colours compare the selected frequency across measured positions. Uncalibrated maps display relative levels in dBFS. Results depend on the microphone, calibration, playback setup and measurement conditions. SPL Reference distinguishes indicative and calibrated workflows and does not claim that an unvalidated device is a certified sound-level meter. Occupational-noise results support assessment and documentation; they do not replace professional judgement or applicable legal requirements.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

Introducing Room Map for Hi-Fi listening rooms. • Map relative bass levels across your room to reveal areas of higher and lower sound pressure. • Explore frequency-selectable heatmaps with 1/12- and 1/3-octave bands. • Follow guided measurement points, review captures and recheck your reference position. • Save room maps in Sessions, organise them in projects and export survey data. Room Map is included with Lifetime Professional, including existing purchases. Use it alongside Room Reference today. Direct integration between the apps is in development and is not included in this release.

Version 1.2

The developer, Direct Sound Records Ltd, 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 Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Contact Info
    • User Content
    • Other Data

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

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
DIRECT SOUND RECORDS LTD
Size
6.4 MB
Category
Utilities
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
Age Rating
16+
  • 16+
  • Learn More
  • Frequent
    Medical Treatment information

    Contains
    User-Generated Content
In-App Purchases
Yes
Copyright
© 2026 DIRECT SOUND RECORDS LTD
  • Developer Website
  • Privacy Policy

    • More by Direct Sound Records Ltd

    You Might Also Like