TabDSP: EQ + Dynamics by John Kessler

TabDSP brings a professional audio-plugin workflow to every browser tab. It applies broadcast-quality DSP to the audio you hear — in real time — using the same algorithms found in high-end studio plugins.

Unlike simple "bass boost" add-ons, TabDSP gives you surgical EQ, transparent dynamics control, and ITU-compliant true-peak limiting. The kind of processing that separates amateur hour from broadcast-ready.

▶ FREE TIER — genuinely useful, not a trial demo:
• 8-band parametric Graphic EQ
• Real-time constant-Q spectrum analyzer
• Linear Phase mode (511-tap FIR, phase-coherent)
• Mid/Side processing
• RMS metering + input/output gain
No time limits, no ads. Many users will find it covers their needs entirely.

▶ UPGRADE (Enthusiast / Professional) to unlock:
• Single-band & multiband compression (Linkwitz-Riley crossovers)
• True Peak limiter — 4× oversampling, 15 compliance presets (EBU R128, Apple Music, Spotify…)
• LUFS metering (Momentary / Short-term / Integrated) + LUFS Stack: target validator, scrolling histogram, LRA
• Drag-and-drop module reordering with glitch-free 50 ms crossfades

▶ WHO IT'S FOR:
Podcast listeners taming inconsistent recordings · music enthusiasts restoring dynamics · livestream viewers fixing harsh audio · audio engineers referencing browser playback with real spectrum + LUFS metering · students learning DSP hands-on.

▶ WHAT TABDSP DOESN'T DO (we believe in transparency):
• Doesn't processes your microphone, calls, or recordings - only the audio you HEAR.
• On Firefox, DRM-protected streams (e.g. Netflix, Disney+) can't be processed due to browser API limits.
• Doesn't record, export, or permanently modify any audio.

▶ PRIVACY:
All audio processing happens locally in your browser via the Web Audio API. TabDSP never records, uploads, or transmits your audio, and collects no personal data or browsing history.

Firefox, desktop only. Version 1.0.0.