# FreeTTS

**Canonical:** https://apis.io/providers/freetts/  
**Website:** https://freetts.org/developers  
**APIs profiled:** 1

Cloud text-to-speech / AI voice service (freetts.org) offering neural voices across 75+ languages via a small REST/JSON API, plus speech-to-text, AI video and voiceover, audiobook generation, an SRT subtitle surface, and first-party Chrome, Edge and Firefox extensions. Built and operated by Outline Technologies (outline.ad), bootstrapped, founded 2025, hosted on Hetzner in Falkenstein DE behind Cloudflare. The API is a proxy over third-party neural TTS: the live GET /api/voices catalogue probed 2026-08-28 returned 1,410 voices across 152 locales sourced from Google (788), Microsoft Edge (318) and Microsoft Azure (304), of which the 318 Edge voices are the free tier. FreeTTS publishes no OpenAPI, no apis.json, no MCP server and no agent card.

## Kin Score — 42.6 / 100 (developing)

Scored 2026-09-02 under rubric 0.18.0. Trend: flat (+0.0 from 42.6).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 8.0 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 57.1 |
| Commercial Clarity | 76.3 |
| Access Clarity | 76.3 |

## Agent readiness — 7.9 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (1)

- **FreeTTS REST API** — REST/JSON API for text-to-speech synthesis, audio and SRT subtitle download, and voice listing. Uses x-api-key header auth. Endpoints: POST /api/v1/tts, GET /api/audio/{file_id}...

## Security (2)

- **Freetts Authentication** — 2 schemes
- **Freetts Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Freetts Plans Pricing**

## Tags

Text-to-Speech, Speech Synthesis, AI-voice, Audio, Media, Accessibility, Speech-to-Text, Content Creation, Developer Tools

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/freetts/). Scores are computed from the provider's own public artifacts under a published rubric.