PPI Analyzer: Measure what your ears actually hear

I'm the guy behind PPI Audio, and PPI Analyzer is a problem I built for myself first. I play guitar through a Quad Cortex — grunge distortion, post-punk overdrive, Gilmour-ish leads, clean arpeggios. Every time I recorded a new preset, I'd check the LUFS meter, see it matched my other takes, hit play back-to-back… and it still sounded louder or quieter than everything else. Drove me a little crazy. Turns out LUFS doesn't care about spectral density. A dense, distorted tone and a sparse clean tone can measure identically and still feel very different in volume — your ear weighs them differently than a standard meter does. So I built a psychoacoustic model (Bark-band loudness, sones, the whole Zwicker-principle rabbit hole) that measures perceived loudness instead of just LUFS, and spits out the exact dB correction to apply to each preset's output. It also flags whether a mismatch is a level problem or a tone problem, and gives you a cut-through score for how well a tone sits in a dense mix. It's a single HTML file — no install, no account, works fully offline in your browser. €29, lifetime updates. Two things I want to be upfront about, because I'd rather you hear them from me: It's built for guitar-in-a-mix use cases first (the EQ suggestions are tuned for that), though the loudness engine itself works for any source. I'm currently running a formal validation pass — blind ear-matching against the tool's suggestions — and I'll be publishing those numbers once they're in. Wanted to ship and get real feedback rather than wait for a perfect study. If you've ever fought with preset volumes not "feeling" right despite matching meters, I'd genuinely love to know — does this match your experience? And if you try it, tell me where it's wrong. That's more useful to me than a compliment.