We are looking for a photo review app that can do the following
1. Send reminders to customers for reviews
2. Automatically generate a unique code and send it to customers once they have done the review
3. Be able to set a function to automatically restrict uniquely generated code to one collection
4. Be able to upload old reviews from a previous app.
Let us know as no.3 is a huge problem for us and we would like to switch to an app which can fulfill all these functions.
I use a combo of 2 apps for this:
1) Bulk Discounts to generate bulk discounts, pretty sure you can do #3 of your requirements.
2) Judge.me for reviews. You can set auto emails, allow photo upload, send unique discount codes (you upload the bulk discount codes from Bulk Discounts app). You can also share reviews on social media (like, share all 5 star reviews), import reviews from another app. They also have performance features and regularly update the app. One of my key apps, I wrote about the details + setting up in this blog post.