Calendly vs Gmail vs ProtonMail vs Spark Mail
| Attribute | ||||
|---|---|---|---|---|
| Category | Events, Scheduling & Booking | Email & Messaging Marketing | Email & Messaging Marketing | Communication |
| Pricing | Free tier | Free tier | Free tier | Free tier |
| Starting price | $10/month | $7/month | $3.99/month | $4.99/month |
| Free tier | Yes | Yes | Yes | Yes |
| Free trial | Yes | Yes | No | Yes |
| Deployment | Cloud | — | — | — |
| API available | Yes | Unknown | Unknown | Unknown |
| Platforms | ios, android | — | — | — |
| Certifications | 4 | — | — | — |
| Integrations | 5 | — | — | — |
| Company | Founded 2013 | — | Founded 2013 | — |
| Feature attributes | ||||
| Sso Saml | ✓ Yes | — Unknown | — Unknown | — Unknown |
| Rbac | — Unknown | — Unknown | — Unknown | — Unknown |
| Mobile App | Ios And Android | — Unknown | — Unknown | — Unknown |
| Webhooks | ✓ Yes | — Unknown | — Unknown | — Unknown |
| Data Export | — Unknown | — Unknown | — Unknown | — Unknown |
| Calendar Integrations | ✓ Yes | — Unknown | — Unknown | — Unknown |
| Group Scheduling | ✓ Yes | — Unknown | — Unknown | — Unknown |
| Payment Collection | ✓ Yes | — Unknown | — Unknown | — Unknown |
| Routing Forms | ✓ Yes | — Unknown | — Unknown | — Unknown |
| Self Hosting | — Unknown | — Unknown | — Unknown | — Unknown |
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.