| Price from | $4.95/mo | $12/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 10 | 6 |
| Spec score · Business Phone Systems | 7.8 (#123) | 9.1 (#10) |
| Auto attendant | Yes | Yes |
| Business numbers | multiple | multiple |
| Call routing | custom | Calls can be sent to the right person, team, or backup. |
| Company history | The company says it transitioned to VoIP in 2005 and its owners have more than 40 years of telecom experience. | The company says two long-time friends founded KrispCall in January 2022 after more than 25 years of shared experience. |
| Desktop and mobile apps | Yes | Yes |
| Free plan | No | No |
| Product | 1-VoIP provides residential and business VoIP phone service and SIP trunking. | KrispCall describes itself as an AI-powered communication platform for business calls, messaging, coaching, and CRM workflows. |