| Price from | $15.83/mo | $9.99/mo |
| Free plan | Yes | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| Plans published | 2 | 3 |
| Spec score · Sales Follow-Up Software | 8.1 (#12) | 8.0 (#16) |
| Integrations | Calm connects with Gmail and Google Calendar, or Outlook and Microsoft Calendar, using read-only access. | Rebump supports CRM workflows through sequence-specific BCC addresses, while Zapier integration and API access are listed for Unlimited Premium. |
| Product | Calm describes itself as an AI-first CRM platform that connects to email and calendar. | Rebump automates customized follow-up emails to recipients when they have not replied. |
| Support | The privacy policy directs users to contact [email protected] for privacy requests and lists technical support as a reason it collects communications. | The maker provides a contact form for questions and comments. |