That's awesome. It's a shame that most apps are charging a non-trivial amount of money. If they think that mindfulness could change people's lives, why don't they make it free so that they can help everyone.
Also, mindfulness is always the same gimmick:
breathe
if you get distracted, it's totally normal, acknowledge the thought and let it go
If you want a concise expansion on meditation, check out Buddha in Blue Jeans by Tai Sheridan. That book will pretty much set you up with a solid meditation and life balance foundation.
I first learned how to meditate using headspace for a few months with a code then after i got the basics i shifted to medito's unguided meditation.
Recently i got a free year subscription for Balance app(you can still claim it), so im using it to learn a few more advanced techniques but most probably i will be back to medito , because its the best ad free open source Android option out there.