| Price from | €599/mo | — |
| Free plan | — | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | — |
| Plans published | 2 | 0 |
| Spec score · Voice APIs | 9.0 (#1) | 6.9 (#20) |
| Company | Callr says it was founded in 2011 and is based in Paris and New York. | The contact page names S.C. Null Team Impex SRL and gives a mailing address in Bucharest, Romania. |
| Founded | 2011 | 2004 |
| Headquarters | Paris and New York | Bucharest, Romania |
| Product | Callr provides an API-first voice and messaging platform with programmable voice, SMS, call tracking, and conversation AI. | YateClient is an instant messenger and softphone based on Yate. |
| Support | Callr describes 24/7 support as part of its service and lists premium customer support for Enterprise. | The site lists a forum, IRC channel, documentation, and mailing list for support. |
