| Price from | €599/mo | €0.04/mo |
| Free plan | — | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Plans published | 2 | 19 |
| Spec score · Transactional SMS Software | 9.1 (#3) | 8.3 (#22) |
| Automation integrations | Callr advertises CRM connectors for Salesforce, HubSpot, Google and Microsoft plus Zapier and Make automation. | SMSLink lists Zapier, Microsoft Power Automate, Integromat, Make, UiPath, RapidAPI, BaseLinker and Integrately connections to more than 2,000 applications. |
| Coverage | Callr says its platform covers more than 220 countries. | SMSLink states coverage in Romania and more than 190 other countries. |
| Founded | 2011 | 2008 |
| Headquarters | Paris and New York | Baia Mare, Maramures, Romania |
| Integrations | Callr lists native connectors for Salesforce, HubSpot, Google Analytics, and Google Ads, plus a REST API and webhooks. | The maker lists eCommerce plugins and integrations including WooCommerce, Magento, PrestaShop, OpenCart, Shopify, Zapier, Microsoft Power Automate, Make, UiPath and RapidAPI. |
| Product | Callr provides an API-first voice and messaging platform with programmable voice, SMS, call tracking, and conversation AI. | SMSLink provides SMS marketing, Mail to SMS, SMS Gateway, 2-Way SMS, SMS Alerts and SMS Connectors through an online platform. |
| Support | Callr describes 24/7 support as part of its service and lists premium customer support for Enterprise. | The provider advertises technical support 24 hours a day, 365 days a year by email and telephone. |
| What it does | Callr provides programmable voice, SMS, call tracking, conversation intelligence and AI voice agents on its own carrier network. | SMSLink is an online SaaS platform combining SMS marketing, Mail to SMS, SMS Gateway, SMS alerts, two-way SMS and SMS connectors. |
