Sendloop allows you to use the free plan indefinitely. With this plan, you can:

• Create and manage an unlimited number of email lists;
• Import your contacts;
• Generate new leads using websites, blogs, and other sites.

However, to send emails to people on your email lists, you must upgrade to one of the paid subscription plans. If so, you can opt for one of two plan options:

• Pay-as-you-go: You can purchase credits for $0.01 per recipient in increments of 1500 credits. When you send a campaign, your credit total goes down one per each recipient.
• Monthly: You can pay a fixed monthly fee to send unlimited emails to a fixed number of subscribers (for example, if you have 500 subscribers, you can send an unlimited number of emails to your subscribers for $9/month).