iStroboSoft Application for the Android Phones. In-app purchases are not available at this time. Peterson Strobe Tuner's popular StroboSoft tuning application iStroboSoft offers the unmatched accuracy of a mechanical strobe tuner for the highest degree of precision available in a software tuning application. Plug in, use the internal microphone or an external microphone and tune your instruments quickly and easily with 1/10th cent accuracy. Peterson Tuners has offered tuning solutions for over 65 years and is the only company specializing in hardware and software tuning products for all levels of musicians. FEATURES: Exclusive strobe display allows you to achieve an unmatched level of accuracy. Note/Octave window displays the correct note and octave for the note being tuned. Cents display allows you to see how far out of tune your note is in cent values. Glowing flat/sharp indicators assist when tuning a note very far from the target position and it is difficult to gauge which direction the strobe is moving. Calibration mode: iStroboSoft can be calibrated to an external source guaranteeing 1/10th cent accuracy. Drop/Capo mode: iStroboSoft will auto-transpose notes up or down to one full octave. Manual note selection mode to zero in on a particular note. Full screen mode permits the strobe display to be maximized on screen to allow better viewing from a distance. Adjustable Concert A: Change the Concert A reference of the tuner to accommodate tuning to a fixed instrument, such as a piano, or tune instruments that do not utilize the typical Western A440 reference. Compatible Operating Systems: 2. 3 and higher Gingerbread3. 1 and higher Honeycomb4. 0 and higher Ice Cream Sandwich4. 1 and higher Jelly Bean4. 4 and higher KitKat5. 0 and higher LollipopNot currently for use with Blue Tooth audio input.