Pay for progress, not for streaks.

The fastest tempo at which you played an exercise with at least 92% of notes right and timing within 12% of the note spacing, on an input Fretmetric trusts. It only goes up when you earn it, so it's a number you can believe.

No. Pitch and timing are analysed in your browser, on your device. Only small summaries (tempo, accuracy, timing error) are saved to your account. Recordings for then-vs-now comparisons are opt-in and stay in this browser.

Just a guitar. Without a mic you follow along: every exercise shows the fingers and strokes with a click to play to, and nothing is scored. To track your playing, any microphone works: a laptop mic is fine in a quiet room, and a USB audio interface gives the most precise timing. Wired headphones help; Bluetooth adds delay, so timed scoring is switched off on Bluetooth unless you override it.

A two-minute calibration measures your setup's delay against a click, and the noise floor of your room. Every result carries a confidence level. Low-confidence sets are shown but never count against you, in trends or in rankings.

It reads your measured skills, your goal and how many minutes you have, then builds a session: warm-up, focus work interleaved in short blocks, spaced reviews of what you've mastered, and one arcade game. Every item says why it was picked. Tempos climb only after two clean sets in a row.

Code computes every number and builds every plan. AI can write the weekly summary and answer questions, but only using numbers it is given, and a validator rejects any number that isn't in your data. Everything works fully without AI.

Yes, with Studio. Students join with a code and consent to share summaries: minutes, practice quality, Clean BPM on assigned exercises. You assign work and see who practised between lessons.

Yes, in one click from Settings, with no retention maze. Annual plans get a reminder email 7 days before renewal. There are no lifetime deals and no paid streak repairs.