CTRL by Napbak — Free Online LUFS Meter & Loudness Penalty Checker
CTRL is a free, browser-based audio mastering analyzer built by Napbak Studio. Measure integrated loudness (LUFS) using the EBU R128 standard, detect true peak levels (dBTP) with 4x oversampling, analyze dynamic range (LRA), and simulate how your music sounds across streaming platforms and playback devices — all in real-time, 100% in your browser.
Features
- EBU R128 / ITU-R BS.1770 compliant integrated loudness measurement (LUFS)
- True Peak detection with 4x oversampling (dBTP)
- Dynamic Range analysis (LRA — Loudness Range)
- Real-time streaming platform loudness penalty preview: Spotify, Apple Music, YouTube, Tidal, Amazon Music, SoundCloud, Beatport, Deezer, Pandora
- Device speaker simulation: iPhone, Car, Laptop, Headphones, AirPods, Bluetooth Speaker, Gaming Headset, Tablet
- Mono compatibility check
- Real-time spectrum analyzer visualization
- 100% client-side — no audio data leaves your browser
Pricing
- Free: 3 analyses per day, LUFS & True Peak, Platform & Device Simulation
- Pro Monthly ($4.99/mo): Unlimited analyses, Dynamic Range (LRA)
- Lifetime ($29.99 one-time): Unlimited analyses, Dynamic Range (LRA), all features forever
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Contact: hello@napbak.studio | Instagram