TrueLoyal

Pros: friendly technical support, functionalities (if you have the professional plan)
Cons: price, limited functionalities (if you use the free or starter plan)

This app offers a lot of functionalities, it allows you to set up custom rules through API as well as customize pre-built rules. It also allows for customization of rewards (% off, $ discount, free shipping). One of my favorite functions is the email notification, it not only notifies members when they earn or redeem points, but it can also send out a notification when members are close to earning their next reward. Furthermore, they have a friendly support staff who are there to answer any of your questions regarding the app. Unfortunately, they are not currently integrated with MailChimp which can limit the personalization of email notifications. Currently, I am still in the process of testing out the app, but it has been quite satisfactory, and a lot more can be done it you know a bit of coding to help you further personalize the app.