Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 AssemblyAIVoice AI infrastructure for builders, with pre-recorded and real-time speech-to-text and voice agent APIs | ReviewsNone yetWrite one for AssemblyAI | Lowest paid plan$0.21per hour of audio for Universal-3.5 Pro pre-recorded transcriptionPay as you go, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 CartesiaVoice agents that answer and make calls, and the speech models behind them, in one API | ReviewsNone yetWrite one for Cartesia | Lowest paid plan$5per monthPro, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 DeepgramSpeech-to-text, text-to-speech and voice agent APIs for real-time, enterprise voice AI | ReviewsNone yetWrite one for Deepgram | Lowest paid planSee plans | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features |
 ElevenLabsCreate lifelike speech with an AI voice generator and voice agents platform, in 90+ languages | ReviewsNone yetWrite one for ElevenLabs | Lowest paid plan$99per monthPro, as of October 19, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 Murf AIBuild AI voice experiences that are natural, scalable and efficient | ReviewsNone yetWrite one for Murf AI | Lowest paid plan$0.01per 1000 characters for Falcon 2.1Pay as you go, as of October 23, 2026 | Free planNot confirmed | Free trialYes | Public APIYes | ||
 Retell AIBuild, deploy, and manage AI voice agents that sound human, execute tasks, and scale | ReviewsNone yetWrite one for Retell AI | Lowest paid plan$0.07per minute for AI voice agents, from $0.07 to $0.31 by modelPay as you go, as of October 20, 2026 | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs on | |
 SpeechmaticsSpeech APIs powering Voice AI | ReviewsNone yetWrite one for Speechmatics | Lowest paid plan$0.12per hour of pre-recorded audioMelia 1, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 VapiBuild, test and deploy voice AI agents. The platform for developers creating conversational voice AI | ReviewsNone yetWrite one for Vapi | Lowest paid plan$29per month, plus usageCore, as of October 19, 2026 | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onNot confirmed |
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a public API. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed