Knuckle

Fingerspelling — shaping letters with a single hand — is one of the most useful things you can learn, and Knuckle makes it approachable by drawing every handshape live on screen rather than hiding it in a blurry photo. Each letter of the alphabet is rendered from a real hand model, so you can see exactly how the fingers curl, spread and where the thumb sits, with a plain-language tip for forming it and a little motion arrow for the letters that involve a movement. The alphabet grid lets you browse and drill each letter, mark the ones you've mastered, and open any of them for a big, clear view. The real fun is the word speller: type a name or a phrase and watch the hand fingerspell it letter by letter at a speed you control, step through it, or loop it until it sticks. A staged lesson path builds you up from small groups of letters to mixed practice, and quizzes test whether you can read a handshape, spell a short word in order, or recall a specific letter — keeping your best score as you improve. You can mirror the hand for left- or right-handed practice, choose a neutral hand tone, and switch freely between English and Norwegian. It works entirely offline with no account and no ads, and it's honest about its scope: this teaches the fingerspelling alphabet, a genuinely handy foundation, rather than a full signed language. Whether you're starting out, teaching a child, or just want to spell your name in the air, Knuckle puts the alphabet at your fingertips.