Side by side
Callr vs Kamailio
Both stand on voice apis. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free trial AndroidAPIiPhone+1
Callr combines programmable communications, tracking, conversation intelligence, and AI agents for business workflows. Its Professional plan has a listed monthly price, while Enterprise requires a custom quote.
Visit Callr
Free plan APILinuxSelf-hosted
Visit Kamailio The facts
| Callr | Kamailio | |
|---|---|---|
| Free plan | A free trial | Yes |
| Open source | No | Not published |
| Runs on | Android, API, iPhone, Web | API, Linux, Self-hosted |
| Lowest paid plan | Professional: €599 a month | Free or on request |
| Plans published | 2 | 1 |
| Maker | Not published | Not published |
| Website | callr.com | kamailio.org |
| On voice apis | #8 of 52 | #4 of 52 |
Callr: what it does well
- Coverage across more than 220 countries
- AI agents support over 30 languages
- Native Salesforce and HubSpot connectors
- REST API and webhooks
- 24/7 support listed
What to know first
- Professional plan costs 599.00 EUR monthly
- No free plan
- Requires API or web integration work
Kamailio: what it does well
Alternatives to Callr Alternatives to Kamailio The whole list