Retell gives developers low-latency voice infrastructure with itemized pricing — voice infra at $0.055/min plus TTS, LLM, and telephony add up to ~$0.11/min typical. SpeechifyAI rolls it into one all-in rate from $0.07/min with LLM included, plus deterministic workflows, tool calling + webhooks, and governance, and 60 free minutes a month.
| Capability | Speechify | Retell |
|---|---|---|
| Pricing | From $0.07/min all-in — LLM included · 60 free min/mo | ~$0.11/min typical ($0.055 infra + TTS + LLM + telephony) |
| What's included | LLM + STT + TTS + orchestration in one rate | Itemized add-ons (KB +$0.005, PII +$0.01, AI QA +$0.10/min) |
| Billing | Per second of talk time | Per second, but charged during silence/hold |
| Free tier | 60 min/mo, commercial use | $10 free credits + 20 free concurrent calls |
| Workflow design | Visual + code, deterministic branching | Drag-and-drop builder + real-time function calling |
| Integrations | Tool calling + webhooks | Build-your-own via custom functions |
| Compliance | SOC 2 Type II | SOC 2 |
| Support model | Forward-deployed engineers on Enterprise | Email / Slack community |
Retell bills you for every second the websocket is open, so silence, hold music, and the caller fumbling for a confirmation number all count against the rate. SpeechifyAI bills per second of talk time instead, so the quiet moments cost nothing, and a long call with hold music or a transfer wait costs noticeably less at the end of the month.
Retell itemizes the bill with $0.055 for infra plus TTS plus telephony plus per-minute add-ons like Knowledge Base, PII redaction, and AI QA stacking on top. SpeechifyAI folds the same compliance posture (SOC 2 Type II, SSO, RBAC, encryption) into the platform fee on a single per-minute rate from $0.07 on Pro, with the visual workflow editor, tool calling, webhooks, and simulated test callers all included instead of priced as line items.
SpeechifyAI covers a production voice agent at one rate from $0.07 a minute, billed on talk time instead of connection time, with the LLM, telephony, workflows, tool calling, and SOC 2 Type II compliance already in the platform fee instead of stacked as separate per-minute line items.