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Your presets lie to your LUFS meter. Two tones at the same LUFS can sound very different in loudness — dense distortion and clean sparkle weigh differently on the ear. PPI Analyzer measures perceived loudness with a Bark-band psychoacoustic model and gives you the exact dB correction for each preset. Works with Quad Cortex, Helix, Kemper, any amp sim. Runs in your browser — offline, no account, no install. One file, lifetime updates
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.
Finally something that shows my Kemper patches are all hot in the same way. Loved that it runs in the browser with no signups, just opened the file and was measuring presets within a minute.
About PPI Analyzer on Product Hunt
“Measure what your ears actually hear”
PPI Analyzer was submitted on Product Hunt and earned 4 upvotes and 2 comments, placing #147 on the daily leaderboard. Your presets lie to your LUFS meter. Two tones at the same LUFS can sound very different in loudness — dense distortion and clean sparkle weigh differently on the ear. PPI Analyzer measures perceived loudness with a Bark-band psychoacoustic model and gives you the exact dB correction for each preset. Works with Quad Cortex, Helix, Kemper, any amp sim. Runs in your browser — offline, no account, no install. One file, lifetime updates
PPI Analyzer was featured in Music (53.5k followers) on Product Hunt. Together, these topics include over 9.7k products, making this a competitive space to launch in.
Who hunted PPI Analyzer?
PPI Analyzer was hunted by Denis Azzellini. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Denis Azzellini