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Head-to-head · AI Voice Agents

Tone vs Deepgram Voice Agent API

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Tone #2 in AI Voice Agents 9.3/10 Free plan Free plan✓ 4 of 4 features Visit Tone
Deepgram Voice Agent API #5 in AI Voice Agents 9.0/10 Paid ✓ 4 of 4 features Visit Deepgram

Tone leads on 1 check, Deepgram Voice Agent API on 0, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreTone · 9.3/10
  • Free planonly Tone

Tone scores higher on our rubric for ai voice agents: 9.3 against 9.0 out of 10; our editors rank them #2 and #5.

Tone offers free plan; Deepgram Voice Agent API doesn't.

Tone is the better fit for teams wanting a complete open-source voice platform. Deepgram Voice Agent API is the better fit for developers building customizable voice infrastructure.

  • Tone fits best

    Teams wanting a complete open-source voice platform

  • Deepgram Voice Agent API fits best

    Developers building customizable voice infrastructure

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Tone 9.3/10 Visit ↗ Deepgram Voice Agent API 9.0/10 Visit ↗
At a glance
Editor score 9.3 9.0
Ranking #2 in AI Voice Agents #5 in AI Voice Agents
Best for Teams wanting a complete open-source voice platform Developers building customizable voice infrastructure
Pricing model Free plan + paid Paid
Starting price $0.09 usage-based $0.06 usage-based
Free plan ✓ (best) —
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Integrations 20 integrations 11 integrations
Features Tone 4/4 · Deepgram Voice Agent API 4/4
Inbound calls ✓ ✓
Outbound calls ✓ ✓
Human handoff ✓ ✓
Custom phone numbers ✓ ✓
Specs
Supported languages 29 languages Not checked yet
Concurrent calls Not checked yet 45 calls
Our review
Pros
  • Self-hosting includes unlimited agents, calls, workflows, and integrations.
  • Visual workflows support conditional branches and human handoff.
  • Testing, call observability, and knowledge citations are built in.
  • One WebSocket pipeline combines speech recognition, LLM processing and speech output.
  • Choose LLM and TTS providers, with function calling and turn-taking controls.
  • Supports inbound and outbound telephony plus self-hosted deployment.
Cons
  • Self-hosting requires teams to bring their own LLM, voice, and telephony.
  • Cloud usage is billed per minute rather than through a fixed plan.
  • Enterprise pricing is not specified in the published plan details.
  • Requires development work to configure and build voice-agent applications.
  • Per-minute pricing varies by tier and provider choices.
  • Custom - BYO LLM + TTS has no listed per-minute rate.
Our verdict

Tone is an open-source platform for teams building phone and other conversational agents. It supports inbound and outbound calls, web widgets, chat, and SMS, with a runtime, workflow builder, knowledge base, testing tools, and…

Read the review →

Deepgram Voice Agent API gives developers a streaming foundation for real-time voice applications, combining speech-to-text, LLM orchestration and text-to-speech over a single WebSocket connection. It is aimed at developers and enterprises…

Read the review →
  1. ToneAI Voice Agents 9.3Free plan
  2. Deepgram Voice Agent APIAI Voice Agents 9.0Paid

Strengths and trade-offs

  • Tone — where it wins

    • Self-hosting includes unlimited agents, calls, workflows, and integrations.
    • Visual workflows support conditional branches and human handoff.
    • Testing, call observability, and knowledge citations are built in.

    Where it doesn't

    • Self-hosting requires teams to bring their own LLM, voice, and telephony.
    • Cloud usage is billed per minute rather than through a fixed plan.
    • Enterprise pricing is not specified in the published plan details.

  • Deepgram Voice Agent API — where it wins

    • One WebSocket pipeline combines speech recognition, LLM processing and speech output.
    • Choose LLM and TTS providers, with function calling and turn-taking controls.
    • Supports inbound and outbound telephony plus self-hosted deployment.

    Where it doesn't

    • Requires development work to configure and build voice-agent applications.
    • Per-minute pricing varies by tier and provider choices.
    • Custom - BYO LLM + TTS has no listed per-minute rate.
  • Tone9.3/10 · Free plan

    A full voice-agent toolkit with free self-hosting and cloud usage priced per minute.

    Visit ToneFull verdict →
  • Deepgram Voice Agent API9.0/10 · Paid

    A configurable voice-agent stack with provider choice, telephony and self-hosting.

    Visit DeepgramFull verdict →

More comparisons

All AI voice agents comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update