Callr vs JustCall

Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.

SpecialistPowerful enterprise AI agent platform for customer service, but tightly coupled to Salesforce rather than standalone like JustCall.

One API key for hundreds of AI models from every major provider

Provides robust cloud calling and AI contact center features, though with a different pricing and UI structure than JustCall.

Real-time voice AI models and agents you can build on

Real-time speech-to-text, text-to-speech and voice agents in one API platform

Build, test, and deploy production-grade voice AI agents over API

SpecialistUnifies messaging apps into a shared team inbox with AI, but lacks JustCall's advanced VoIP phone calling features.

Free / Open-sourceOne key for 4,100+ agent tools, pay per call

SpecialistStrong omnichannel messaging integration for sales and support, but less focused on traditional telephony and cloud calling than JustCall.

Enterprise-grade voice AI for complex customer service workflows, but significantly heavier and more expensive than JustCall.

Offers similar virtual phone numbers and VoIP calling features, but with stronger focus on out-of-the-box AI voice agents.