iPad · iPhone · iOS Apps

loudness METER PRO

Loudness metering per EBU R128 / ITU-R BS.1770-4, full engine on iPad, compact loudness METER on iPhone for the road. Two distinct apps, one shared DSP truth.

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By an experienced sound engineer
Built by an active broadcast engineer for broadcast engineers. Same DSP engine as the plugin/standalone version, nothing simplified, nothing dropped.
Buy once
No in-app purchases, no ads. Apple Family Sharing for up to 5 additional people. Updates through your Apple account.
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Support emails go straight to the developer's inbox, not into a ticket system. Usually within 24 hours on working days.
iPad full version · iPadOS 16+

loudness METER PRO for iPad

The full broadcast meter engine in touch format. Silero VAD, live forecast, RTW PPM, goniometer, radar, FFT, histograms, everything you know from the desktop, plus MIDI remote for control.

pegelWERK loudness METER PRO on iPad
EBU R128

Loudness engine

Momentary, short-term and integrated loudness with proper 400 ms gating at 75 % overlap. Power-domain double precision, no LUFS drift on hour-long programs. LRA per EBU Tech 3342.

True Peak

4x polyphase TP

Inter-sample peak detection with a 4x oversampling polyphase FIR filter. Compatible with every R128 limiter. 200 ms update rate, smooth, not jittery.

Speech AI

Speech clarity in real-time

Silero VAD v5 detects speech even under music. wespeaker ResNet34-LM with speaker-lock detects speaker changes. Traffic light: Good · Fair · Poor, tells you whether your voice lands before the phone rings.

Forecast

Live forecast to programme end

Prediction of integrated loudness and LRA at programme end based on history. Programme-duration panel with remaining time, 4-field banner with loudness trend, LRA trend and reserve.

RTW-Style

Full visualisation

PPM bars on the broadcast scale (-59...-5) with cyan/green/red zones, goniometer with correlation, FFT spectrum, loudness radar and three histograms (loudness, LRA, R128 gating). Familiar look for experienced engineers.

Remote

MIDI Learn + Bluetooth

OPTIONS MIDI: start, stop and reset via external controllers. Bluetooth-MIDI pairing straight from the app, no adapter, no cable, no setup. Perfect for control rooms.

01

Launch the app

Plug in an external audio interface or work with the built-in mic. The audio session detects the interface and prefers it automatically.

02

Measure

All values in real-time: LUFS-I/S/M, TP, LRA, speech clarity, correlation. Histograms document the run as you work.

03

Correct

Predictive readout shows before the end whether you're in the R128 corridor. Forecast banner with loudness trend and reserve helps you adjust early.

04

Remote

Start, stop and reset via MIDI controller or Bluetooth footswitch. OPTIONS dialog for MIDI Learn, assign once, stored permanently.

Standards & DSP

  • Standards EBU R128 · ITU-R BS.1770-4
  • LRA EBU Tech 3342
  • Gating 400 ms · 75 % Overlap
  • True Peak 4x polyphase FIR
  • Sample-Rates 44.1 / 48 kHz
  • Update 200 ms (LUFS)

AI & Visualisation

  • VAD Silero v5 (ONNX, lokal)
  • Speaker wespeaker ResNet34-LM
  • Speaker-Lock Cosine-Sim 0.25
  • Median 1.5 s Smoothing
  • PPM-Skala -59 / -41 / -29 / -23 / -17 / -11 / -5
  • Histogramme Loudness · LRA · Gating

Platform & I/O

  • OS iPadOS 16+ (iPad-only)
  • Bundle com.satk.broadcastmeter
  • Modi All / Live / Analytics
  • MIDI Learn + Bluetooth Pairing
  • Audio externe Interfaces (RME, UA, ...)
  • UI Dark, Sprache English
iPhone compact · iOS 16+

loudness METER

Loudness check on the go. Two swipe pages, Meters and Spectrum, same DSP engine as the iPad version, in your pocket.

loudness METER on iPhone, meters page
Page Meters
loudness METER on iPhone, spectrum page
Page Spectrum
Engine

Same DSP as iPad

LUFS-I/S/M, 400 ms gating at 75 % overlap, 4x polyphase true peak, identical DSP truth to the full version. No "lite" mode, just a reduced surface.

Swipe

Two pages, one swipe

Page 1: PPM bars and LUFS values. Page 2: FFT spectrum. Dots bottom-right show the active page; swipe to switch, no hidden menus.

Background

Lock the screen, keep measuring

Background audio mode active: metering continues even when the iPhone locks. Ideal for long-run measurements in the studio.

Format

Portrait and landscape

Portrait for a quick level check on the platform, landscape for detailed reading at the table. The layout adapts automatically.

Not in loudness METER

Deliberately omitted to keep the app lean and fast: Silero VAD and speaker engine (no ONNX runtime on iPhone), MIDI Learn, GPI, live forecast, histograms, loudness radar. Want all that in one app? Get loudness METER PRO for iPad.