Tune Lab — Simple, accurate guitar tuner that works instantly. Just pluck a string. Tune Lab listens through your microphone and shows you exactly how in tune you are — no buttons to press, no setup needed. FEATURES • Real-time pitch detection via microphone • Visual needle dial showing deviation in cents • All 6 guitar strings: E2 · A2 · D3 · G3 · B3 · E4 • Reference tone for each string to tune by ear • Clean dark interface, easy to read in any lighting • No internet required · No account needed · Completely free