I have been using JudgeMe and Loox. Both are great. if you want to start with a free plan Judgeme might fit your needs. As for Loox they are fully on paid plans.
If you are interested in something new I suggest you take a look on new app Reviify.
I guarantee you will be delighted.
Reviify is an all-in-one app for Ecommerce Review Management.
COPMPLETE ALL JUST A CLICK. FREE VERSION IS AVAILABLE.
Reviify is the fastest way to get your shop up and running with minimal frustration. Simply sign up, add your details, and let the app handle your review management.
Install the app and choose your package. You can easily import reviews, set up notifications and popups for future reviews, and import everything you need from Aliexpress easily.
As per your concern, you might find a Review app in our all-in-one marketing platform. We do have a free version to start off, once your business grows, you can also upgrade if you need extra functionality.
The best thing is that our platform is not only about Review app, but free version also comes with Social Login and Wishlist, you might check our website in order to understand the value you get for the amount of money spent