Working out the shot
The most common question here is how you calculate shutter speed with an ND filter, and the ND Filter Calculator works out how long an exposure runs behind a 10 stop filter. The Depth of Field Calculator sets hyperfocal distance, the Print Size and DPI Calculator checks whether a 24 megapixel file holds up at 300 DPI, the Crop Factor Calculator translates a full frame focal length, and the Time-Lapse Interval Calculator and 500 Rule Calculator plan frame counts and star exposures.
Answers mid rehearsal
Mid rehearsal the Chord Finder, Scale Generator and the interactive Circle of Fifths answer the questions that come up on the spot, the Chord Chart Transposer moves a whole chart into the singer's key, and the Delay and Reverb Time Calculator gives millisecond values for the tempo you are actually playing. The Capo Position Calculator, Note Frequency Chart, Chord Progression Generator and Interval Ear Trainer fill in the rest, whether you are writing, tuning or training your ear.
Nothing leaves your phone
Every calculation happens right on your own phone or computer, so nothing here is sent to us. No photo or audio file is uploaded, there is no sign up and no account to create, and nothing tracks you. That matters most where the signal is worst, which is often exactly where you need the numbers: a dark hillside with the 500 Rule Calculator open, or a studio with one bar of signal and the Note Frequency Chart on screen.