7 alternatives to Retell AI (6 free)
7 alternatives to Retell AI, picked out of 4 saved Instagram reels and 3 liked tweets, from creators like @airesearches, @haroonkhaans, @ElevenLabsDevs. 6 of them are free, freemium or open source.
Bland is a voice AI infrastructure platform that builds, tests, and deploys natural-sounding phone agents. It provides ultra-low latency, handles realistic speech quirks like interruptions and pauses, and operates with enterprise compliance including SOC 2 and HIPAA.
ElevenLabs Conversational AI lets users build natural-sounding, low-latency voice agents for inbound and outbound calling. It integrates customizable system prompts, voice models, and knowledge bases to handle customer service and appointments without code.
A setup guide for routing ElevenLabs Conversational AI voice agents through custom LLMs hosted on GroqCloud, including Llama 4 Scout and Maverick. It replaces the default ElevenLabs language model to achieve faster text generation speeds and reduce conversational latency. The configuration requires specifying a Groq API key and model endpoint inside ElevenLabs' agent settings.
LiveKit Agents is an open-source framework designed to build programmable, server-side voice and multimodal AI participants. It coordinates real-time audio transport with plug-and-play speech-to-text, LLM, and text-to-speech providers alongside voice activity detection. It solves the hard parts of conversational AI, including low latency, interruption handling, and room-level media routing.
This recipe pairs LiveKit's VoicePipelineAgent with Groq-hosted Whisper and Llama 3.3-70B, using self-hosted Kokoro TTS for speech generation. It provides a drop-in, significantly cheaper alternative to commercial voice APIs like ElevenLabs while maintaining low latency.
OpenHome is an operating system and voice SDK for creating conversational AI agents on the web and hardware devices. It lets users configure custom agent personalities, clone voices, choose underlying LLMs like GPT-4o, and tune real-time conversation dynamics like auto-interruption. Developers can also deploy agents to local Linux hardware, dev kits, and smart home appliances.
Synthflow is a voice AI platform that lets businesses create and deploy custom telephone agents for inbound and outbound calls. It features a visual flow designer, native telephony integration with low latency, and a marketplace for licensing pre-built agent templates.