Retell AI vs ZenMic

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	Retell AI Audio	ZenMic Audio
Tagline	Build, test and deploy production-grade AI voice agents for inbound and outbound calls.	Text-to-podcast generator with multi-speaker AI voices and RSS publishing.
Category	Audio	Audio
Pricing	Freemium· Pay-as-you-go: $0.07-$0.31/minute · Enterprise: Custom Pricing	Freemium· Monthly: $19 · Yearly: ≈ $8.25/mo · Early Adopter Tier: ?
Model	LLM-agnostic (OpenAI, Anthropic, Google and others selectable per agent); proprietary turn-taking model and voice pipeline in-house	—
Editorial score	—	7.0 / 10
Use cases	AI inbound call answeringOutbound lead qualificationAppointment scheduling and remindersCollections and payment dialers24/7 customer support triageIVR replacementHealthcare intake and follow-up callsInsurance claims first-notice-of-lossVoice-enabled RAG knowledge assistantsChat and SMS agents sharing a voice knowledge base	text-to-podcastcontent-repurposingai-voiceovermulti-speaker-audiorss-publishing
Pros	Sub-second end-to-end latency (~600 ms) with a purpose-built turn-taking model — conversations feel natural rather than walkie-talkie. Batteries-included telephony: bring Twilio/Vonage/Telnyx/Amazon Connect or use Retell-provisioned numbers with SIP trunking. Real function calling for booking, transfers, payments and CRM writes, with pre-built HubSpot, Salesforce, Cal.com, n8n, Zapier and Make integrations. Streaming RAG knowledge base with auto-sync, plus simulation testing and continuous QA — the operational glue most DIY voice stacks skip. Enterprise compliance out of the box: HIPAA, SOC 2 Type II, GDPR, PII removal and safety guardrails as toggleable add-ons. Genuinely transparent pay-as-you-go pricing with a $10 starter credit, so you can benchmark cost per call before committing.	Editable scripts and per-speaker voice assignment, not a black-box generator Built-in RSS feed for Apple Podcasts and Spotify distribution Flat, transparent pricing with commercial rights included API access available on the paid plan Generous free tier with no credit card required
Cons	Per-minute costs stack quickly once you enable QA ($0.10/min), knowledge base, denoising and premium LLMs — a 'cheap' agent can land near $0.30+/min. The specific LLMs are pluggable but Retell doesn't publish a default recommendation, so cost/quality tuning is on you. Not open source and there is no self-hosted option — regulated buyers who need on-prem inference are out of scope. Voice/telephony focus means it is overkill (and overpriced) for pure text chatbots you could run on a generic LLM API. True enterprise features (unlimited concurrency, custom compliance, dedicated support) require a sales conversation, not a self-serve upgrade.	100 minutes/month cap with no higher tier published Underlying TTS model isn't disclosed Single-plan pricing leaves heavy producers stranded
Website	www.retellai.com	zenmic.com

Pick Retell AI if

✅ Sub-second end-to-end latency (~600 ms) with a purpose-built turn-taking model — conversations feel natural rather than walkie-talkie.
✅ Batteries-included telephony: bring Twilio/Vonage/Telnyx/Amazon Connect or use Retell-provisioned numbers with SIP trunking.
✅ Real function calling for booking, transfers, payments and CRM writes, with pre-built HubSpot, Salesforce, Cal.com, n8n, Zapier and Make integrations.
✅ Streaming RAG knowledge base with auto-sync, plus simulation testing and continuous QA — the operational glue most DIY voice stacks skip.

Pick ZenMic if

✅ Editable scripts and per-speaker voice assignment, not a black-box generator
✅ Built-in RSS feed for Apple Podcasts and Spotify distribution
✅ Flat, transparent pricing with commercial rights included
✅ API access available on the paid plan

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