Retell AI alternatives

Voice-agent platform with vendor focus on sub-800ms turn latency and proprietary voice models. Y Combinator S24; raised $4.6M seed Aug 2024 (BoxGroup + others); >$1M ARR by month 6 per founders. Direct competitor to Vapi with proprietary-model focus. Full Retell AI record →

  1. 1 Pipecat (Daily) Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 17k released 2026-08-01 BSD-2-Clause Compare with Retell AI →

  2. 2 LiveKit Agents Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 13k released 2026-08-27 Apache-2.0 (framework); turn-detector models… Compare with Retell AI →

  3. 3 OpenAI Realtime API Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ? Self-host ✓ Managed ✓ MCP ✓ ★ 6.9k Compare with Retell AI →

  4. 4 Bland AI Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ? Self-host ✓ Managed ✓ MCP ✓ Compare with Retell AI →

  5. 5 Cartesia Sonic Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ? Self-host ✓ Managed ✓ MCP ✓ Compare with Retell AI →

  6. 6 ElevenLabs Conversational AI (now ElevenAgents) Voice agent platforms ⚠ renamed — now ElevenAgents

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Retell AI →

  7. 7 Vapi Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Retell AI →

  8. 8 CallRail Conversation Intelligence Voice agent platforms

    also in Voice agent platforms · same storage (kv) · same retrieval (injection) · same conflict handling (stateless) · same memory unit (turn) · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with Retell AI →

Ranked by shared memory design (storage, retrieval, conflict handling, memory unit), same section and shared must-haves (open source, self-hosting, MCP), with adoption as a tie-breaker. ✓ confirmed · — no · ? not in the catalog yet. Want picks for your own requirements? Use the chooser. Checking a whole project? Check your stack.