SwirliNyx

The app is straightforward and has lots of templates to choose from which are very customisable, the staff are super helpful and you can add extras to documents like product metafields, etc, which they will help code for you!

The app was simple to use and did exactly what I needed it to do (lock a collection with a password). I needed some help from customer service who helped me straight away with a solution. Great app, I would recommend!