The Track Runner app for Windows Phone is incredibly popular and highly-rated (4.8 out of 5 with over 600 reviews), but making so awesome of an app free of charge and free of ads means making money can be tricky. So developer The App Cauldron is offering users the option to donate to support the app, and development of version 5.0 of Track Runner.
While Track Runner includes a number of fantastic features already — like SensorCore support, interval training, and more — they're promising even more goodness for the next version. But they still want it to be free:
We are determined to keep Track Runner free of charge and without annoying banner ads while cranking out those sweet updates. The App Cauldron is invested in the Windows Phone running community – now it's your turn to invest in us!
If you want to make a donation to help support development of Track Runner and The App Cauldron's other Windows Phone apps, you can do so at the source link below. The plan for donations and taking some money from affiliate links is only for short-term revenue, though, but the team would certainly appreciate your support regardless.
Source: The App Cauldron