Can I implement my email collector manually on platforms other than Magento?

Yes! It's really easy actually. Our collector is initialized with this script tag:

<script type="text/javascript" src="//cdn.recapture.io/sdk/v1/ra-queue.min.js"></script>
<script type="text/javascript">
  ra('init', ['YOUR_API_KEY']);
  ra('page');
</script>

Simple add that JavaScript to every page where you want to potentially show your email collector, and replace YOUR_API_KEY with your API key (you can find it in your  account settings, at the top of the page under Account Identification).

For Shopify and WooCommerce, you can just enable it directly like Magento.