EQSweep is a free, beta Android app that lets users fine-tune their headphones — including Google Pixel Buds, by listening to real-time frequency sweeps instead of guessing with sliders or presets. It’s not a Google product. It’s not bundled with any device. And it’s not on the Play Store yet. But it’s already changing how people hear their earbuds. The app works by playing a continuous sine wave that sweeps across the full audible range (20 Hz to 20 kHz). As the tone moves, users listen for frequencies that sound unnaturally loud or faint, revealing peaks and dips in their headphones’ actual frequency response. Those problem spots become editable bands: up to 10 per profile, each adjustable for gain, width, and center frequency. For Pixel Buds owners, that means fixing the default treble-forward signature without flattening vocals or gutting bass. One Android Police tester used it to tame upper-mids, then saved a second profile for bass-heavy tracks like Run The Jewels. Boosting lows and mids on demand. EQSweep doesn’t replace hardware. It won’t fix distortion at high volume or add ANC where none exists. But it does let users treat headphones as tunable tools, not static endpoints. Profiles export in standard formats (like Wavelet-compatible configs), so tweaks survive app reinstalls or even move to other equalizers. Right now, access requires signing up as a beta tester. No price. No subscription. No ads. Just a functional, community-built tool filling a gap Google’s built-in EQ leaves wide open. It’s live now. If you know where to look. And if you own Pixel Buds, or any Android-connected headphones, it’s the first real chance to hear them the way you want them to sound.