At 18:57 24-05-17, Borys Medicky wrote:

 >Pitchlab, for some reason, is marketed as a guitar tuner, but the
 >trifling cost of the Pro upgrade gets you a piano keyboard from which
 >any pitch can be selected.  It's a bit odd that a versatile tuner like
 >this is identified primarily as for guitars, but I guess the author
 >has identified the market from which the bulk of sales can be expected.

I think the author originally intended the app for guitars, and 
people then started using it for other instruments.  One can define, 
for instance, the four cello strings and these display in the same 
manner as the guitar strings.  Having chosen a temperament, one can 
use it for all 12 notes in all octaves, if one wishes.  Personally, I 
use it only to establish the basic 1/4 comma C-G-D-A-E fifths that 
are common to many tunings, either by checking what I have done or, 
if I feel tired (or lazy), setting the four pitches.  I find the 
measurement discrimination of PitchLab is finer than I can actually 
set the string, a discrepancy of half a cent from ideal often being 
the best that can be achieved, though perfectly adequate, of course. 

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