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LudyMeter - Sound Level Meter
by Ludy Ankas, LLC
Description
LudyMeter measures sound levels with professional accuracy — and does two things no other app can: track your noise exposure under EU workplace safety rules and detect musical notes from frequency peaks.
No subscription. No ads. No data leaves your device.
--- WHAT YOU GET FOR FREE ---
The free tier is genuinely useful, not a teaser. You get a real-time A-weighted decibel meter with min, max, and average tracking. See how loud your environment is compared to everyday sounds ("As loud as a vacuum cleaner" or "Hearing damage risk after 2 hours"). Save your last 7 days of measurements and share beautiful sound level cards with friends. Works entirely offline.
--- PRO ($14.99 one-time) ---
Unlock the full frequency analyzer: real-time FFT spectrum, 1/1 and 1/3 octave band display, and musical note detection that translates raw frequencies into note names like A4, E3, or Bb2 — with cent deviation. Compare before and after with A/B measurement snapshots. View spectrograms and get EQ recommendations for your room. Export unlimited measurement history to CSV. Supports A, C, and Z frequency weighting plus Fast, Slow, and Impulse time constants.
Perfect for musicians, sound engineers, and audio enthusiasts who want a professional spectrum analyzer without a professional price tag.
--- SAFETY ($49.99 one-time) ---
The first and only iOS app with EU Directive 2003/10/EC noise exposure tracking. Calculate LEX,8h (daily noise exposure normalized to 8 hours), track LCpeak, and monitor your dose percentage in real time. A three-zone warning system turns green, amber, or red at the EU action values of 80, 85, and 87 dB(A). Get haptic alerts when you cross a threshold. Run full-shift background monitoring without keeping the screen on. Generate PDF screening reports with timestamps, location, and exposure status for workplace documentation.
Also includes NIOSH and OSHA dosimeter modes for US workplace standards.
Note: LudyMeter is a screening and awareness tool. It does not replace certified Class 1 or Class 2 sound level meters required for legally binding workplace noise assessments.
--- WHY LUDYMETER ---
PRIVACY FIRST
Zero data collection. Zero analytics. Zero server calls. Your microphone audio is processed entirely on your iPhone and never recorded or transmitted. Works in airplane mode. App Store privacy label: Data Not Collected.
BUILT FOR iOS 26
Designed from scratch with Liquid Glass, Dynamic Island, Live Activity, and home screen widgets. Dark mode optimized. 60fps animations driven by real audio input.
TRANSPARENT CALIBRATION
Three-tier calibration system: automatic per-device offset profiles, user single-point calibration against a reference, and external measurement microphone support with .cal file loading. We tell you exactly how accurate your readings are.
ONE-TIME PURCHASE
We believe utility apps should not charge monthly rent. Pay once for Pro or Safety, use forever. Free updates included.
--- TECHNICAL SPECIFICATIONS ---
- Frequency weighting: A, C, Z (flat)
- Time weighting: Fast (125ms), Slow (1s), Impulse (35ms rise / 1500ms decay)
- FFT: 4096-point Hann window, 50% overlap, 20 Hz update rate
- Octave bands: 1/1 (10 bands) and 1/3 (33 bands), IEC 61260-1 centers
- Pitch detection: YIN algorithm, +/-0.5 cent accuracy
- Audio engine: AVAudioEngine in .measurement mode (no AGC, no noise suppression)
- EU thresholds: 80/85/87 dB(A) LEX,8h, 135/137/140 dB(C) LCpeak
- US standards: NIOSH REL (85 dBA/8h, 3dB exchange), OSHA PEL (90 dBA/8h, 5dB exchange)
- Minimum device: iPhone with iOS 17+
- Designed for: iOS 26 Liquid Glass
From the makers of Ludy apps. Questions? ludy@ludy.app
No subscription. No ads. No data leaves your device.
--- WHAT YOU GET FOR FREE ---
The free tier is genuinely useful, not a teaser. You get a real-time A-weighted decibel meter with min, max, and average tracking. See how loud your environment is compared to everyday sounds ("As loud as a vacuum cleaner" or "Hearing damage risk after 2 hours"). Save your last 7 days of measurements and share beautiful sound level cards with friends. Works entirely offline.
--- PRO ($14.99 one-time) ---
Unlock the full frequency analyzer: real-time FFT spectrum, 1/1 and 1/3 octave band display, and musical note detection that translates raw frequencies into note names like A4, E3, or Bb2 — with cent deviation. Compare before and after with A/B measurement snapshots. View spectrograms and get EQ recommendations for your room. Export unlimited measurement history to CSV. Supports A, C, and Z frequency weighting plus Fast, Slow, and Impulse time constants.
Perfect for musicians, sound engineers, and audio enthusiasts who want a professional spectrum analyzer without a professional price tag.
--- SAFETY ($49.99 one-time) ---
The first and only iOS app with EU Directive 2003/10/EC noise exposure tracking. Calculate LEX,8h (daily noise exposure normalized to 8 hours), track LCpeak, and monitor your dose percentage in real time. A three-zone warning system turns green, amber, or red at the EU action values of 80, 85, and 87 dB(A). Get haptic alerts when you cross a threshold. Run full-shift background monitoring without keeping the screen on. Generate PDF screening reports with timestamps, location, and exposure status for workplace documentation.
Also includes NIOSH and OSHA dosimeter modes for US workplace standards.
Note: LudyMeter is a screening and awareness tool. It does not replace certified Class 1 or Class 2 sound level meters required for legally binding workplace noise assessments.
--- WHY LUDYMETER ---
PRIVACY FIRST
Zero data collection. Zero analytics. Zero server calls. Your microphone audio is processed entirely on your iPhone and never recorded or transmitted. Works in airplane mode. App Store privacy label: Data Not Collected.
BUILT FOR iOS 26
Designed from scratch with Liquid Glass, Dynamic Island, Live Activity, and home screen widgets. Dark mode optimized. 60fps animations driven by real audio input.
TRANSPARENT CALIBRATION
Three-tier calibration system: automatic per-device offset profiles, user single-point calibration against a reference, and external measurement microphone support with .cal file loading. We tell you exactly how accurate your readings are.
ONE-TIME PURCHASE
We believe utility apps should not charge monthly rent. Pay once for Pro or Safety, use forever. Free updates included.
--- TECHNICAL SPECIFICATIONS ---
- Frequency weighting: A, C, Z (flat)
- Time weighting: Fast (125ms), Slow (1s), Impulse (35ms rise / 1500ms decay)
- FFT: 4096-point Hann window, 50% overlap, 20 Hz update rate
- Octave bands: 1/1 (10 bands) and 1/3 (33 bands), IEC 61260-1 centers
- Pitch detection: YIN algorithm, +/-0.5 cent accuracy
- Audio engine: AVAudioEngine in .measurement mode (no AGC, no noise suppression)
- EU thresholds: 80/85/87 dB(A) LEX,8h, 135/137/140 dB(C) LCpeak
- US standards: NIOSH REL (85 dBA/8h, 3dB exchange), OSHA PEL (90 dBA/8h, 5dB exchange)
- Minimum device: iPhone with iOS 17+
- Designed for: iOS 26 Liquid Glass
From the makers of Ludy apps. Questions? ludy@ludy.app
