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Tone
Bengaluru and San Francisco
What it is
Tone is an open-source voice AI platform for building, deploying and self-hosting voice agents. Agents can support inbound and outbound calls, web widgets or chat, combining prompts, tools, workflows, models, voices and speech-to-text providers. Its knowledge base accepts PDFs, scraped documents, Notion and Confluence content, with retrieval, re-ranking, citations and custom vocabulary. A visual workflow builder supports branching, loops, human handoff, TypeScript hooks and triggers from Zapier, REST API or HighLevel. The test center runs simulated calls and replays production calls; observability includes latency, interruption rate, sentiment, recordings, dashboards and alerts. Developers get a TypeScript-first SDK, CLI and hosted API. Self-hosting uses Docker Compose or a Kubernetes Helm chart. The MIT-licensed runtime, call routing and evaluation harness are published on GitHub. The free Self-host plan includes unlimited agents, calls and workflows. Cloud is billed at $0.09 per minute and includes $10 free credit with no card required; Enterprise pricing is custom.
For and against
For
- Supports inbound, outbound, web-widget and chat agents
- Workflow builder includes human handoff and branching
- Self-host option is free and includes unlimited calls
- MIT-licensed runtime and tools are published on GitHub
Against
- Self-host plan requires users to bring their own model, voice and telephony
- Cloud is billed at $0.09 per minute
- Enterprise pricing is custom and not listed
The verdict
Tone offers both a free self-hosted option and per-minute Cloud usage, with tools for building, testing and monitoring voice agents. Deployment choice and the required supporting services are important considerations.
Who it suits
Tone suits developers building voice agents who want hosted or self-hosted deployment, workflow controls and call monitoring. Its free Self-host plan is aimed at teams prepared to bring their own model, voice and telephony.
Plans and prices
Self-host
Unlimited agents, calls, workflows · Bring your own LLM, voice, telephony · Docker Compose & Helm chart · Community Discord support
Read 30 Sep 2026 · trytone.ai
Cloud
$10 free credit, no card required · Auto-scaling worker fleet · 99.99% uptime SLA · SOC 2 Type II
Read 30 Sep 2026 · trytone.ai
Enterprise
Single-tenant or on-prem · BAA, DPA, custom contracts · Dedicated support and Slack channel · Custom integrations and roadmap
Read 30 Sep 2026 · trytone.ai
On the record
- Agent channels
- Agents can run inbound, outbound, web-widget, or chat experiences.trytone.ai · read 30 Sep 2026
- Agent composition
- Agents combine prompts, tools, workflows, configurable models, voices, and speech-to-text providers.trytone.ai · read 30 Sep 2026
- Developer access
- Tone provides a TypeScript-first SDK, CLI, local Docker development loop, composable runtime, and hosted API access.trytone.ai · read 30 Sep 2026
- Integrations
- Listed integrations include OpenAI, Anthropic, Google Gemini, Mistral, Llama, ElevenLabs, Cartesia, PlayHT, Deepgram, Whisper, AssemblyAI, Twilio, Telnyx, Plivo, LiveKit, HubSpot, Salesforce, Zapier, n8n, Slack, Notion, Confluence, and GoHighLevel.trytone.ai · read 30 Sep 2026
- Knowledge base
- Tone ingests PDFs, scraped documents, Notion, and Confluence content and provides chunking, embeddings, retrieval, re-ranking, citations, and custom vocabulary.trytone.ai · read 30 Sep 2026
- Observability
- Observability includes interruption rate, latency, sentiment, gibberish detection, stereo recordings, waveform inspection, custom dashboards, and real-time alerts.trytone.ai · read 30 Sep 2026
- Open-source license
- Tone is MIT licensed and its agent runtime, call routing, and evaluation harness are published on GitHub.trytone.ai · read 30 Sep 2026
- Performance
- The product page states a 218 ms voice-loop p50, 120 ms time-to-first-byte, 10k+ concurrent calls per region, 29 supported languages, and a 99.99% Cloud uptime SLA.trytone.ai · read 30 Sep 2026
- Security posture
- The site states SOC 2 Type II, HIPAA-ready, and GDPR compliance, and the changelog says edge PII redaction and HMAC-SHA256 webhook signing were added.trytone.ai · read 30 Sep 2026
- Self-hosting
- Tone can be started with Docker Compose and includes a Kubernetes Helm chart, with Postgres, Redis, and ClickHouse in the example stack.trytone.ai · read 30 Sep 2026
- Support
- Self-host customers receive community Discord support, Cloud customers receive email and chat support, and Enterprise customers receive dedicated support with a Slack channel.trytone.ai · read 30 Sep 2026
- Testing
- The test center runs simulated calls with personas, accents, and edge cases, supports parallel regression runs, and replays production calls.trytone.ai · read 30 Sep 2026
- What it does
- Tone is an open-source voice AI platform for building, deploying, and self-hosting voice agents.trytone.ai · read 30 Sep 2026
- Workflow builder
- The visual workflow builder supports branching, loops, human handoff, TypeScript hooks, and triggers from Zapier, REST API, or HighLevel.trytone.ai · read 30 Sep 2026
