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Tone review

Freemium#2 of 32 in AI Voice Agents

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

9.3/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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 observability in one product. Its mix of self-hosted and managed-cloud deployment makes it relevant to teams that want control over infrastructure as well as those that prefer hosted access.

The self-host plan costs nothing and includes unlimited agents, calls, and workflows, along with all integrations. Teams supply their own language model, voice, and telephony services, and can deploy with Docker Compose or a Kubernetes Helm chart. Community support is provided through Discord. The cloud plan charges $0.09 per minute and includes a free credit without requiring a card, an auto-scaling worker fleet, a 99.99% uptime SLA, and SOC 2 Type II and HIPAA-ready posture. Enterprise adds dedicated infrastructure, single-tenant or on-premises deployment, custom SLAs and contracts, dedicated support, audit logs, SSO/SAML, and RBAC.

Tone’s feature set extends beyond call handling: visual flows can route through conditional branches or hand off to a human, while its knowledge base ingests documents and provides citations. The test center supports simulated calls, personas, and replay; observability covers latency, interruptions, sentiment, and recording metrics. TypeScript and Python SDKs, hosted API access, and integrations spanning OpenAI, Anthropic, Google Gemini, speech providers, and telephony services such as Twilio, Telnyx, Plivo, LiveKit, and SIP broaden deployment choices. Teams comfortable operating their own stack may favor the free self-host option; those seeking managed usage can start with per-minute cloud billing. Organizations needing dedicated deployment controls can consider Enterprise, while teams seeking fixed cloud pricing may prefer another model.

Tone pros and cons

  • 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.

Tone fact sheet, pricing and score →

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