| Price from | $69/mo | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 3 | 1 |
| Spec score · Cold Email Software | 8.2 (#12) | 7.6 (#30) |
| Integrations | Slack, Zapier and the Chrome extension are listed as basic integrations; HubSpot and Pipedrive are included on Growth, and Salesforce on Enterprise. | It supports Gmail, Microsoft 365/Outlook, and SMTP relays such as Amazon SES and Brevo, with optional IMAP reply sync. |
| Intended users | Overloop describes Starter as for individuals, Growth for growing teams and Enterprise for large teams. | The README describes it as designed for sales teams, agencies, and indie hackers doing cold outreach. |
| Product | Overloop helps find B2B prospects, get contact details and run personalized email and LinkedIn outreach sequences. | Quickly is a free, open-source cold email platform designed for self-hosted cold outreach. |
| Security | Overloop says it encrypts data in transit with TLS and uses Cloudflare for DDoS protection. | The listed stack uses JWT HS256, bcrypt, HMAC API keys, and Fernet token encryption. |
