Tone

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

Tone is ranked #4 of 31 in AI voice agents on Inferse. It runs on API, Self-hosted, Web. There is a free plan. A free trial is offered. Paid plans start at $0.09/mo.

Compared on AI voice agents

Free plan: Yestrytone.ai
Inbound calls: Yestrytone.ai
Outbound calls: Yestrytone.ai
Human handoff: Yestrytone.ai
Supported languages: 29 languagestrytone.ai
Custom phone numbers: Yestrytone.ai

Facts

What it does: Tone is an open-source voice AI platform for building, deploying, and self-hosting voice agents.trytone.ai · 30 Sept 2026
Agent channels: Agents can run inbound, outbound, web-widget, or chat experiences.trytone.ai · 30 Sept 2026
Agent composition: Agents combine prompts, tools, workflows, configurable models, voices, and speech-to-text providers.trytone.ai · 30 Sept 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 · 30 Sept 2026
Workflow builder: The visual workflow builder supports branching, loops, human handoff, TypeScript hooks, and triggers from Zapier, REST API, or HighLevel.trytone.ai · 30 Sept 2026
Testing: The test center runs simulated calls with personas, accents, and edge cases, supports parallel regression runs, and replays production calls.trytone.ai · 30 Sept 2026
Observability: Observability includes interruption rate, latency, sentiment, gibberish detection, stereo recordings, waveform inspection, custom dashboards, and real-time alerts.trytone.ai · 30 Sept 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 · 30 Sept 2026
Open-source license: Tone is MIT licensed and its agent runtime, call routing, and evaluation harness are published on GitHub.trytone.ai · 30 Sept 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 · 30 Sept 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 · 30 Sept 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 · 30 Sept 2026
Developer access: Tone provides a TypeScript-first SDK, CLI, local Docker development loop, composable runtime, and hosted API access.trytone.ai · 30 Sept 2026