Hey there Kevin!
Wesley here from the Shopify Guru team. So my favourite app for newsletter popups is Privy: https://apps.shopify.com/privy. Privy has te best free option of any newsletter pop up in my opinion, and they have a great paid version as well.
Pop up window: https://apps.shopify.com/pop-up-window is also another great option.
Just though I'd throw my two cents in here!
I second the use of Privy - we installed it last month and more than doubled our email sign ups (from 14 to 32) in one month.
We have also found a few other positive side effects, which I can't blame entierly on Privy... but thats the only thing I can think of that we have changed!
We've reduced our bounce rate from 49% to... 6.79% Yes, you read that right! Plus, our pageviews have trippled - We have it set up for exit intent, so I think when people see we are offering a 10% discount if they sign up people go back to our site and browse some more.
Can't say for definate that Privy caused this of course, so I'd love to hear if anyone else has had similar results. I even looked to see if Google had changed how they calculate bounce rate I was that shocked!
Hope this helps :)
Hi Janice, Aweber is an itegration partner of ours and you can easily sync your new emails with their app integration in Justuno. Jenna is on live chat and can help with any questions etc too.
How to sync Aweber: https://justuno.zendesk.com/hc/en-us/articles/217477818-Aweber-Integration