صيام التطوع is a free fasting app developed by PhonApps for Android users. The app is designed to help users keep track of their voluntary fasts, as well as the recommended fasting days in Islam. The app is user-friendly and easy to navigate, making it accessible for all ages.

The app includes a comprehensive list of fasting days for the year, including the days of Ashura, Arafah, and the six days of Shawwal. The app also allows users to set reminders for their fasts and track their progress. The app is an excellent tool for those looking to increase their spiritual devotion through voluntary fasting.

Overall, صيام التطوع is a fantastic app for Muslims looking to keep track of their voluntary fasts. The app is easy to use and provides a comprehensive list of fasting days, making it an excellent resource for those looking to increase their spiritual devotion.