| Price from | Free | $8.25/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 3 | 3 |
| Spec score · Personal Email Services | 8.8 (#12) | 8.7 (#18) |
| Ad-free inbox | No | Yes |
| Email aliases | Yes | No |
| Authentication | AT&T recommends OAuth apps, which it says encrypt the username and password; apps without OAuth require a 16-character secure mail key. | HEY requires two-factor authentication for paying customers and supports TOTP and WebAuthn. |
| Free plan | Yes | No |
| Mailbox storage | 5120 | 100 |
| Platform access | web_mobile_desktop | web_mobile_desktop |
| Support | AT&T provides self-service setup, troubleshooting, security, password, and account recovery help, plus support videos. | HEY directs customers with questions to [email protected]. |
