TKBirthdayReminder is a free Android app that allows you to keep track of upcoming birthdays. The app includes a widget for the Android home screen, and once a day, you receive notifications about upcoming birthdays.

The app works only with Google Contacts, and it requires syncing with Google Contacts to function properly. Please note that Facebook birthdays are not supported.

With TKBirthdayReminder, you can set the time when you wish to be reminded, and you can choose to be reminded on the day of the birthday or in advance. Depending on the Android version, you can also choose which sound is played to remind you.

Overall, TKBirthdayReminder is a simple and straightforward app that fulfills its purpose without any advertisements or data collection.