Amai PreOrder Manager + Notify

I have just started using this app 1 month ago and I find it to be the best one currently available, just note that it will take time to get it set up proper. I added pre-orders to 1000 products and it took about 12 hours to set up. Settings can only be edited on 50 products at a time so it can take awhile but I feel it's worth it for the benefits of managing pre-order separately.

Also in case of ...

Easy to set up and use. It's the best solution if you don't want to miss any sales when you are out of stock. Responsive support. Highly recommended.

Fantastic app.

Easy setup.

Awesome support!

It was way easier to use than I thought it would be! Pretty nice integration! Thanks team!

Great app, does exactly what I needed it to do. One little hiccup and the support jumped on it and helped me right away!! Awesome :)

Great product. Great customer service. No complain at all. This is the best pre order manager across the shopify app store.

Update, 12-31-16: They've made that change (below) due to my suggestion. Good job guys! Thank you for valuing your customer's feedback.
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Update, 12-26-2016: Many thanks to P.Z. from support for helping me install the id for my add to cart button in my liquid files. It was a tedious task and I only hope Pre-Order Manager can automatically make this change once you switch over to a new theme ...

Works very well, simple and effective.

Great and simple app, that is free and does what it says it does. So grateful to not have to pay for this feature, when these days any added funciton in Shopify requires more $$.

The app is awesome that help me generate plenty of sales. Had an issue with the app but their customer service is first class. Got it solved within the day.