Kong Reviews
Kong Reviews

Speech and voice AI services compared: free tiers and pricing

9 speech and voice ai services, each with its free tier and lowest paid price as read from its pricing page.

ServiceFree tierLowest paid priceChecked
AssemblyAIFree: up to 185 hours pre-recorded and 333 hours streamingFrom $0.15/hour (pre-recorded); $0.21/hour for another model tier2026-10-23
CartesiaFree: $0/mo with $1 of prepaid agent usagePro $5/mo; Startup $49/mo; Scale $299/mo2026-10-23
DeepgramFree $200 creditNova-3 monolingual from $0.0048/min (pay as you go, promotional)2026-10-23
ElevenLabsFree plan$0.08 per 1K characters (v4); cheaper Flash models from $0.042026-10-23
OpenAI API—GPT-Transcribe $0.0045/min; GPT-Live-1 $0.05/min2026-10-23
Retell AI$10 in free credits, 20 concurrent calls$0.07 to $0.31 per minute, all-in2026-10-23
SpeechmaticsFree start with $100 in creditsFrom $0.12 per hour2026-10-23
Vapi$5 free credit, 1 phone numberPlatform fee from about $0.0095 per minute plus model, voice and telephony costs2026-10-23
xAI API—Voice from $0.08/min; images $0.02 each2026-10-23

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