Subscribers
Contact Collection is a freemium app, while still on the free package you receive 50 subscribers free, this is a perfect amount to try out the app. This amount lasts most sites about two months. With the premium package you get unlimited subscribers.
Sometimes Mailchimp lists have more required fields, not just an email address. That means Mailchimp is blocking us from adding new subscribers to your list. Please make sure your list only has the email address as a required field or simply create a new list as this is the default settings for new lists on Mailchimp.

Another possible reason, is if you turned on the double opt-in option, remember that users must first confirm that they want to join your mailing list before Mailchimp adds them.

Another possible reason, Mailchimp doesn't order your list by newest subscriber. To see the newest subscribers that joined your list, click the “Date Added” column header of the table to sort it.
Yes! If you wish to have different forms on your site, you can also use different lists and settings in each of them.
Mailchimp
You don't have to use Mailchimp to install Contact Collection.
Every new subscriber you get on your site will be sent to you via email and will also be saved in your site's contacts on the Wix platform. So, you'll also be able to contact your subscribers directly and not just through Mailchimp.
To setup Mailchimp do the following:

  1. Have a Mailchimp account ready and create a list (make sure not to use a list that requires more mandatory fields)
  2. Go to your Wix website editor and double click our widget to open the app's settings window, click to connect your Mailchimp account, enter your username and password in the newly opened window.
  3. Enter an email for notifications, so you're notified when there are new subscribers or there is a problem.
  4. Select the list you want to use from the dropdown list.
  5. You're done! You can use a different browser window to test the app. Each subscriber will be added to your Mailchimp list and to your Wix account as a "contact".
For a step by step video on how to connect Wix to Mailchimp, click here.

Welcome emails are possible.

Mailchimp has an amazing amount of features when it comes to email marketing, you can create full automation if you'd like. And they also support what they call "welcome emails" when someone new joins your list (from our widget or any other way) they will receive this pre defined email.

You can read more about it here
Yes it does.
Simply check the "Use double opt-in" option under the Mailchimp list selector and you're good to go.
General
To upgrade your account and enjoy unlimited subscribers, go to the app's settings page by double clicking the Contact Collection widget. Now look for the purple upgrade button.
To show our widget as a pop-up / lightbox, please follow the instructions we made here
Yes, you can add multiple Contact Collection forms to your site. Each one can have its own style, design and can be connected to different Mailchimp lists.