Rapida AI vs Retell AI

Rapida AI is an open-source platform for building and operating voice AI agents across phone, web, WhatsApp and SIP. It supports speech processing with voice activity detection and noise cancellation, knowledge retrieval, language-model routing and live call transfer. Teams can bring their own speech-to-text, text-to-speech and language-model providers or route between them without rewriting application logic. Listed integrations include Twilio, Vonage, Exotel, Asterisk, OpenAI, Anthropic, Google Gemini, Deepgram, ElevenLabs, Azure and AWS. Agents can call HTTP endpoints during conversations and sync data from Notion, GitHub, HubSpot and Jira. Rapida provides session traces, transcripts, call monitoring, handoff visibility, request and webhook logs, and debugging context. It offers managed cloud or self-hosted deployment. The maker says self-hosting keeps audio, transcripts and customer data on the user's infrastructure; setup requires Docker and at least 4 GB RAM for Voice Only, or 8–16 GB with the knowledge base. Launch is free. Scale costs $500 a month, Grow costs $2,000 a month, and Enterprise pricing is custom.

Retell AI is a platform for building, deploying and managing AI agents that handle phone calls. Agents can also work through web and in-app chat, SMS and custom API-based communication. A visual canvas supports call flows with functions, integrations, transfers, DTMF, SMS and custom logic. Teams can simulate scenarios, turn production calls into regression tests and QA calls. Deployment options include inbound calls, outbound campaigns, web and SMS, including a website widget. Call handling includes IVR navigation, live monitoring and transfer or takeover by a person. The integrations directory names Twilio, GoHighLevel, HubSpot, Salesforce, Zapier, Make, n8n and Google Workspace. The homepage lists HIPAA, SOC 2 Type II, GDPR and ISO 27001 compliance, along with SSO, personal information redaction and module-level role permissions. Enterprise on-premise deployment is available within a customer’s infrastructure. Pay as you go is listed at $0.07 a month, with voice agents priced at $0.07-$0.31 per minute, $10 in free credits and 20 concurrent calls included. Enterprise pricing is custom.