Active leads are the contacts you upload in Smartlead, similar to contacts in HubSpot; if you upload 1000 leads to a campaign, they are considered 1000 active leads. If you upload similar leads to a new campaign, they are not considered a "new active lead" as they already exist in our system.
Our lead system can act as a nice "hack" to almost infinite leads depending on your campaign length. If you upload 1k leads and start a campaign on the 1st of Jan and the length of the campaign is 7 days (with sequence delays), after 7 days, you can delete the campaign and all the leads associated with that campaign. In this case, 1k leads will be "added back" to your account, so you can recycle this as you'd like
You can view the usage of the lead credits and email credits in the Smartlead application.
Refer to the screenshot below:
Note:
The lead credits will not reset every month it will remain the same as per your plan. You will need to upgrade your plan to upload more leads.