Addons are additional module which provides more accessibilities on email verifier pro features.
Extended License users get access to all email verifier pro existing and future addons for free. If you have just purchased the license recently then you have to wait 7 days to manually request them to receive.
Regular License users will only see a sample Demo Addon on this page. But they can buy SaaS Addons Pack for upgrading their existing app.
To know more about available addons and features on each addon, check Addons doc section