What are some alternatives?
When comparing Karrot Fit and Zero, you can also consider the following products
iRewardHealth - Motivating healthy behavior change
Privacy.com - Get a new virtual card for every transaction
Optimity: Live.Work.Play - Get rewarded for your healthy habits
CleanEmail - Clean Email is an online service that empowers you to take control of your mailbox.
SQRL - Save $1 for every 1000 steps you take
Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.