Automated best-of radar
Best Free Voice agents options.
Candidates with a source-backed free tier, free endpoint, free trial, pretrained download, open weights, open-source license, or self-hosted path. Automated radar for live audio, turn-taking, telephony, and real-time voice agent platforms. Rankings use existing source-backed radar data and do not invent prices, benchmark scores, release dates, or capabilities.
Candidates
6
matched automatically
Top fit
100
Gemini Live API
Sources
10
canonical links retained
Access
Free/open
filtered automatically
Updated
Jun 26, 2026
listed in sitemap
Best overall radar pick
Gemini Live API
Highest automated fit score using source-backed task evidence and radar signals.
Best API or hosted option
Gemini Live API
Strong candidate when the source metadata indicates API or hosted-service availability.
Best open-source option
LiveKit Agents
Strong candidate when open weights, GitHub, permissive license, or self-hosting signals are visible.
Best developer momentum
Gemini Live API
Strong candidate with fresh GitHub, Hub, Product Hunt, or radar momentum.
| # | Candidate | Type | Access | Source | Fit | Updated | Why it matched | Evidence |
|---|---|---|---|---|---|---|---|---|
| 01 | Gemini Live APIGoogle API service | service | Paid API | Official service page | RDR100 | Jun 26, 2026 | Matched voice agent, realtime voice, real-time voice; 2 source links; official service signal; access model: Paid API | ai.google.dev |
| 02 | LiveKit AgentsLiveKit framework | service | Paid API | Official service page | RDR91 | Jun 26, 2026 | Matched voice agent, realtime voice, telephony agent; 2 source links; official service signal; access model: Paid API | docs.livekit.io |
| 03 | Deepgram Speech AIDeepgram API service | service | Paid API | Official service page | RDR82 | Jun 26, 2026 | Matched voice agent, voice agents, realtime voice; 2 source links; official service signal; access model: Paid API | deepgram.com |
| 04 | Gemini Live TranslationGoogle API service | service | Paid API | Official service page | RDR79 | Jun 26, 2026 | Matched live audio, speech-to-speech, speech to speech; 1 source link; official service signal; access model: Paid API | ai.google.dev |
| 05 | Google Gemini APIGoogle API service | service | Paid API | Official service page | RDR77 | Jun 26, 2026 | Matched voice agent, live audio; 2 source links; official service signal; access model: Paid API | ai.google.dev |
| 06 | Cartesia Voice APICartesia API service | service | Paid API | Official service page | RDR76 | Jun 26, 2026 | Matched voice agent, realtime voice; 2 source links; official service signal; access model: Paid API | docs.cartesia.ai |