CBG Tuner - Cigar Box Guitar

CBG Tuner is a precision instrument tuner built specifically for cigar box guitars — the 3 and 4-string instruments played by blues, folk, and DIY musicians everywhere. Most tuner apps are built for standard 6-string guitar and treat everything else as an afterthought. CBG Tuner starts from the opposite direction: every tuning in this app is a real cigar box guitar tuning, and nothing else got in the way of making the tuner itself as accurate and easy to read as possible. FEATURES • Analog needle gauge with a digital Hz and cents readout, so you can tune by eye at a glance or confirm the exact frequency • Every common 3-string tuning: Open G, Open D, Open A, Open E, Open C, modal/jazz voicings, Seasick Steve's "Trance Wonder" (G-G-B), and standard fretted tuning • Every common 4-string tuning: Open G, Open D (both voicings), Open C, Open A, G-D-G-B, "Chicago Tenor," "Arkansas Tenor," and more • Custom tuning builder — enter any string as a note name (like G2) or an exact frequency in Hz, and save it for next time • Tap any string to lock the tuner onto it, instead of relying purely on auto-detect — useful when a string is badly out of tune • Adjustable A4 reference pitch (calibration) for players who tune slightly off standard concert pitch • Suggested string gauges for each tuning, as a starting point when restringing • Save your favorite tunings for one-tap access • Works offline once installed — no signal needed in the garage, on stage, or around the campfire Whether you're tuning a cigar box guitar, a diddley bow, or any other homemade 3 or 4-string instrument, CBG Tuner gives you a real analog-style tuning experience without digging through six-string presets that don't apply to you.