My KaiOS Projects:

Keep track of your menstrual cycles with Period Tracker. It tracks your periods, cycles, ovulation and the chance of conception.

Attention! This app may not be 100% accurate and for irregularities, you are advised to visit the doctor.
A menstrual cycle starts with the first day of the period and ends with the start of the next period. An entire menstrual cycle usually lasts between 24 and 38 days, but the length may vary from cycle to cycle, and may also change over the years. Cycle length changes between menarche (when periods first start during puberty) and menopause (when periods stop permanently).
Each menstrual cycle starts with menstruation (the period). A period is the normal shedding of blood and endometrium (the lining of the uterus) through the cervix and vagina. A normal period may last up to 8 days, but on average lasts about 5 or 6.
You can change this values in "Settings" page.
On "Calendar" page you can see your past and future perion (marked in red) and ovulation (marked in green).

This app calculates the phase and position of the moon for a given date. It was adapted from a BASIC program from the Astronomical Computing column of Sky & Telescope, April 1994.
The 'Moon Phase' app will initialize itself to your phone day, month, and year. The day, month, and year can be changed using the 'Date' button. 
Also, app show ecliptic latitude and longitude in degrees, the moon’s distance in Earth radii, age of moon and constellation of moon.

Check if you have Color Blindness. Our test may help you to check if you have vision problem. Each plate contain a number. To pass each test you must identify the correct number.
Preferably have mild natural light and no glare on your screen. Interior lights and glare can alter the color of the pictures.
Attempt to identify the hidden number within 5 seconds then press on the button "I see...".
Choose number that you saw.
The answer will be revealed along with an analysis explaining your condition if you got it wrong.
Continue to the next test, complete them all to help gauge your color blindness severity.
Notes:This test cannot guarantee complete accuracy. Your screen and quality loss of images may affect the original colors used. Should these tests suggest that you may be color blind, you should seek professional confirmation.

Lost? Do not know where the north, and where the south? Use your phone as a compass!

How it works:
Hold your phone face horizontal, and turn so that the top of phone (sun icon) points toward the sun.
To find where the sun is on a cloudy day, hold a pencil or stick upright over a light piece of paper or a lighter part of the ground. The stick or pencil will cast some kind of shadow, indicating the position of the sun.
This app can be used anywhere during the day (from 6:00 A.M. to 6:00 P.M.), when the sun is visible.
The Compass app works best in the fall and winter months, with the worst case behavior in the middle of the year (errors can exceed 30 degrees)

All wallpapers are hand-picked, to make each and every background looks beautiful and stunning. All backgrounds are available in "Portrait" and "Landscape" mode (selected automatically). New wallpapers every week!

Listen to radio and music from hundreds of international internet radio stations streaming live right now. Find the best free Internet radio, AM and FM stations, and live web radio.