| Price from | €3/mo | €599/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 5 | 2 |
| Spec score · Voice APIs | 8.7 (#3) | 9.0 (#1) |
| Spec score · Transactional SMS Software | 8.7 (#8) | 9.1 (#3) |
| Company | The maker is 46elks AB, with its listed company address in Uppsala, Sweden. | Callr says it was founded in 2011 and is based in Paris and New York. |
| Founded | 2011 | 2011 |
| Headquarters | Uppsala, Sweden | Paris and New York |
| Integrations | Listed integrations include Zapier, GitHub Actions, Homey, Sigfox, Laravel, Node-RED, Flow XO, FileMaker, WordPress, and Google Sheets. | Callr lists native connectors for Salesforce, HubSpot, Google Analytics, and Google Ads, plus a REST API and webhooks. |
| Product | 46elks describes itself as a telecom API for applications to send SMS, receive MMS photos, and make automatic phone calls. | Callr provides an API-first voice and messaging platform with programmable voice, SMS, call tracking, and conversation AI. |
| SMS | The API supports sending SMS and forwarding incoming SMS to a backend with webhooks. | The platform supports inbound and outbound SMS, custom sender IDs, short codes, long numbers, delivery reports and GSM or Unicode text. |
| Support | Standard support is available by phone and email on workdays from 09:00 to 16:00 CET, with best-effort response typically within 60 minutes and 24/7 failure reporting. | Callr describes 24/7 support as part of its service and lists premium customer support for Enterprise. |
