Cleartune
My cleartune app is proving useless for harp. I get wildly inaccurate and inconsistent readings. Side by side with my korg tuner, I can see there is no problem with the harp or my ears :) is it just mine? I dumped and reinstalled it but no change. No big deal, my korg works, but the iPhone app would have been very handy and rechargeable
Have you tried the 'needle damping' option? Click on the 'i' (info) icon and increase the 'needle damping' option. Also holding the harp right up to the iPhone mic helps.
I also still prefer my korg though.
I have a similar experience with Cleartune. It will get the note eventually, but mostly the dial just spins wildly. It does work and I have used it but I'm sure there are better programs than this one. If I try to blow a 3-6 octave on a C harp, it will get the G note eventually but too slowly to be really useful.