Harpwren

Your lever harp, set for any key in seconds.

You choose a key and a mode → Harpwren shows which levers to raise, and which to leave down, on your own strings.
You choose a key your tuning cannot reach → Harpwren shows which note is missing a half step, and the base tuning where it would play.
You choose two keys for a change mid-piece → Harpwren shows the letters to flip and how many levers that is across your range, lowest string first.
You choose your strings, lowest note and base tuning → Harpwren shows the harp on its side, every string with its letter, octave and lever, C and F strings in your colours.
You choose a string and tap Replace → Harpwren shows its material, age and earlier strings, and marks strings older than the threshold you set.
You choose a string that buzzes or sounds off → Harpwren shows it in your regulation notes with a status (ok, check, adjust), ready for the next technician visit.
You choose your tuning → Harpwren shows every key and mode it plays: major, natural minor, Dorian, Mixolydian, Lydian, Phrygian, Locrian, harmonic and melodic minor, and both pentatonics.

What it is not
Harpwren is not a tuner. It never uses the microphone, never records or plays sound, and asks for no permissions. It does not know string lifetimes either: the age thresholds are yours. There is no account and no network use; everything stays on your iPhone.

Free and Pro
Free: one harp from 22 to 40 strings in E-flat or C tuning, the string chart, the key finder for every key and mode, key changes, the list of playable keys, the string log and regulation notes. Nothing is time-limited.
Pro, a one-time purchase: several harps, printing the chart with levers set and the sheet of keys for your tuning (PDF), CSV export of the string log, custom base tunings with per-string exceptions, and set lists that count lever flips between pieces and find the order with the fewest.