Choose Ryffio for markedly faster replies, a lower minute price, more included lines and knowledge without a per-base fee. Choose Retell AI for its established telephony workflows and partner network.
On the same end-to-end measure, Ryffio's median reply came 462 ms sooner than Retell's (1,278 vs 1,740 ms) and its p95 654 ms sooner (1,605 vs 2,259 ms). Ryffio's platform fee is $0.03/min against Retell's $0.055 voice infrastructure, with 25 concurrent calls included against 20. Knowledge bases and retrieval are part of the platform; Retell charges $8 per knowledge base per month after the first ten, plus $0.005/min when one is used. Roles are included; Retell lists them in Enterprise.
Ryffio also gives you a technology supplier with a focused support team. The current hosting region is US East; discuss data-location requirements before purchase.
Where Retell AI fits best
Choose based on your requirements.
Mature phone workflows, numbers sold in many countries and a solution-partner network.
If your existing setup already meets its goals, switching has a cost. Run a controlled evaluation rather than assuming a feature checklist proves a better result.
Feature and pricing summary
Measured latency and cost, and published plan differences, reviewed 24 October 2026. Method.
Dimension
Ryffio
Retell AI
Reply time, end to end with the agent (real phone calls)
1,278 ms median · 1,605 ms p95
No end-to-end figure published (“~600 ms” server-side claim) · independent: 1,740 ms median · 2,259 ms p95
Own Rust agent runtime: ≥ 1,000 calls per CPU core
Not published
Voice cloning
Custom voices: clone any license-free voice, or a voice you own the rights to; instant and private
Voice clone option in the voice selector
Team roles
Admin, editor and viewer included
Roles in Enterprise
Knowledge
Retrieval included; model usage applies
10 bases free, then $8/base/month + $0.005/min
Speech & voice choice
Choose configured providers per assistant
Retell and external voice providers
Starting point
Prepaid credits from $5; no required monthly platform subscription
Pay as you go; enterprise terms available
Platform / hosting component
$0.03/min, with speech, model, analysis and transport at cost
$0.055/min voice infrastructure + other components
Compare the full bill
One hosting rate is not the total price.
Ryffio itemises the platform, speech recognition, model, voice, post-call analysis and phone transport. Your carrier can also bill separately. Retell lists $0.055/min for voice infrastructure and additional usage components. Its pricing calculator also lists feature add-ons. Compare the same model, voice, knowledge requirements and call duration.
For 10 minutes, Ryffio’s platform component is $0.30 before other usage; on the cheapest stack a 10-minute phone call costs about $0.58 in all, carrier included. Review the full Ryffio pricing model.
How to evaluate a switch
Bring your prompts, knowledge files and test scenarios. Rebuild conversation flows and tools, configure your carrier, and compare real call outcomes before moving traffic. Existing Retell flows and call history are not automatically imported.
Choose one representative use case and capture a baseline of successful outcomes, costs and response times.
Create a Ryffio account and add credits, or agree an enterprise evaluation.
Rebuild the agent and connections. Test consent, pronunciation, interruptions, tools, failure cases and transfers.
Review call outcomes and the full cost. Move a small amount of traffic only after the results meet your criteria.
Latency is the full pipeline with the agent: the gap from the moment the caller stops speaking to the agent's first audio, measured on real phone calls with the Openbenchmarks open-source analyzer (github.com/openbenchmarks-labs/voice-agent-latency) on a dual-channel Twilio carrier recording. Ryffio ran Openbenchmarks' Northwind support agent and question sets on a dedicated-CPU host in US East on 25 October 2026, with Gemini 3.5 Transcribe Live, Gemini 3.5 Flash-Lite, Fish Audio Drama 3 and a 0.2 s end-of-speech wait. Vapi, Retell AI and ElevenLabs publish no end-to-end figure of their own; their numbers are Openbenchmarks' independent measurements (leaderboard of 1 August 2026, about 400 turns each over Plivo, endpointing tuned down). Our sample is smaller and our carrier is Twilio. Cost per minute uses each platform's cheapest published configuration for a phone call, including a carrier: Ryffio with gpt-4o-mini-transcribe, Gemini 3.5 Flash-Lite and OpenAI TTS at the usage of a measured call (about 6,750 prompt tokens, 60 completion tokens and 270 spoken characters per minute), plus Twilio inbound at $0.0085/min. Agent-runtime capacity was measured on one machine with mocked AI providers against open-source Python Pipecat. Prices are in USD and exclude tax.
“Included” means no separate Ryffio feature subscription; the underlying model, speech, analysis and transport usage can still cost money. Feature availability, provider limits and commercial terms can change. Check the linked sources before purchasing.
Ryffio is the publisher of this comparison, not an independent reviewer. Our latency sample is smaller than Openbenchmarks’ (about 400 turns per platform), and differences under about 50 ms are within its error budget. We do not claim that shared features are exclusive. Test the same scenarios and models before moving traffic.
Test your workflow before you switch.
Register, add credits and test an agent. For a larger rollout, agree an evaluation with our team.
Ryffio