Simple Banjo Tuner

Really a must-have: this chromatic banjo tuner is very fast, accurate and recognizes all strings using the built-in mic! Easy and perfect fine-tuning for all 4-, 5- and 6-strings banjo types ...
This app is developed by a musician and electrical engineer, thus it combines high usability and cutting-edge signal processing.
Simple Banjo Tuner is easy to use and provides an aesthetic and customizable user interface.
Features:
+ Default banjo: G4-D3-G3-B3-D4 tuning
+ Tone accuracy: +/- 1.0 cents
+ Large frequency range (22 Hz to 1000 Hz).
+ Gauge view of the detected tone (semitone) and octave.
+ Tuning by ear.
+ Detailed user manual.
+ Free user support.
+ Developed for the iPhone and iPad.
In-App-Purchase:
+ Extension for all kinds of banjos and tunings (Tenor, Open G, Double C, Sawmill, etc.)
+ Calibration: 430 – 480 Hz (1 Hz-steps)
+ Display of exact frequency (in Hz)
+ Display of frequency deviation (in Hz, marked by up/down arrow)
+ Spectral view (FFT – visualization of overtones)
+ Time-domain view (amplitude)
+ Configurable user interface (color picker)

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MORE:
In the case that you experience crashes (or other inconveniences) with this app, please contact me (before you give a low rating to this app) - you may use the following contact form:
http://www.simpleukuleletuner.com/support.html
where you can describe the issue.
Thanks in advance!