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"The basic idea behind open source is very simple. When programmers on the Internet can read, redistribute, and modify the source for a piece of software, it evolves. People improve it, people adapt it, people fix bugs. And this can happen at a speed that, if one is used to the slow pace of conventional software development, seems astonishing...
...The Open Source pages exist to make this case to the commercial world."    - Introduction to Open Source -

* Pitcha

market download Pitcha is an open-source ( pitch detector for Android smartphones.

It uses the McLeod Pitch Method to estimate the fundamental frequency of the raw sound data that is being recorded by the microphone.

It works with all recorded sound, such as human voices, whistling, and musical instruments - try it out.


Due to the nature of smartphone microphones, the frequency range isn't very large. It has trouble with frequencies lower than the low E on a guitar. I have not found the high limit yet.


Place phone near audio source and make sure the sound is sustained and clear. For example, with a guitar, pick the string hard, and let it ring for ~2 seconds.

Recent changes:
* Overhauled and tested on API 21/Lollipop

Content rating: Everyone

Author: Sevag Hanssian
Version: 2.0
Market link: com.sevag.pitcha
Web site:

Source code:
Code license:
Market downloads: <50
Market rating: 3.0 / 5.0
Category: Top:/Applications/Music & Audio

Added: 2015-03-31
Updated: 2015-06-01
Hits: 503

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