GuitarTunePro is a free, browser-based chromatic tuner for musicians tired of ad-cluttered or inaccurate tuning apps. What stands out: audio processing happens 100% locally in your browser - nothing is ever sent to a server, unlike most tuner apps. It offers ±1 cent accuracy with auto string detection, 10+ tuning presets (Drop D, Open G, DADGAD, Half-Step Down), and bass/ukulele support. No download, no sign-up, no paywall - just open the page and tune.