Speko vs Retell AI
Speko and Retell AI both help teams ship voice agents. Retell AI is a voice agent platform for phone AI. Speko is a voice AI platform that includes speech-to-text, the language model, text-to-speech, telephony and routing through one API for $0.09 per connected minute.
Retell assembles a phone-agent rate from selected components. Speko includes the full voice stack in one connected-minute rate.
Speko vs Retell AI, side by side
| Speko | Retell AI | |
|---|---|---|
| What it is | Voice AI platform for developers and in-house enterprise voice teams | a voice agent platform for phone AI |
| Voice stack | STT, LLM, TTS, telephony and routing through one API | A bundled voice engine with a supported set of provider combinations |
| Provider setup | Managed behind one API | Components are selected from Retell-supported options |
| Pricing | $0.09/min, all-in (STT, LLM, TTS, telephony and routing) | Base voice infrastructure is $0.055/min. TTS and LLM charges are added by model choice. The published $0.07-$0.31/min range is composite, not a platform fee. Custom SIP is $0; the listed US carrier option is about $0.015/min. 20 concurrent calls included, then $8/additional concurrent call/month. |
| Billing | One invoice | Component pricing for infrastructure, models, telephony and add-ons |
| Hosting | Fully managed | Fully managed |
| Public research | Publishes public STT and TTS provider benchmarks | See the vendor documentation and evaluation tools |
| Designed for | Developers and in-house voice teams that want the full stack behind one API | Teams building managed phone agents with component pricing |
What Retell AI offers
- Component pricing calculator
- 20 concurrent calls included
- Custom SIP option listed at $0 per minute
Cost and setup details
- TTS, LLM and telephony depend on the selected configuration
- Optional features can add to the per-minute rate
- Additional concurrency is $8 per call per month
Retell AI pricing and product details checked against Retell AI pricing , verified 2026-07-23.
One API for the full voice stack
Speko includes STT, LLM, TTS, telephony and routing in one connected-minute rate. Public benchmarks help teams evaluate provider performance while they build.
FAQ
Is Speko a Retell AI alternative?
Yes. Speko and Retell AI are options for building voice agents, with different product scope and billing structures. Retell assembles a phone-agent rate from selected components. Speko includes the full voice stack in one connected-minute rate.
How much does Retell AI cost compared to Speko?
Speko is $0.09 per connected minute, all-in (STT, LLM, TTS, telephony and routing), with the first 100 minutes free. Retell AI pricing: Voice Infra starts at $0.055/min. TTS, LLM, telephony, and optional features vary by configuration. Billing model: Component pricing for infrastructure, models, telephony and add-ons. Sources: Retell AI pricing, verified 2026-07-23.
What is included in Speko pricing?
Speko includes STT, LLM, TTS, telephony and routing for $0.09 per connected minute. The first 100 minutes are free, and phone numbers are $2 each per month.
Where can I compare voice AI pricing line by line?
See speko.ai/voice-ai-alternatives-pricing-comparison for a dated comparison of platform, model, telephony, subscription and other charges with first-party source links.