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.
FreeTTS publishes 1 API on the APIs.io network. Tagged areas include Text-to-Speech, Speech Synthesis, AI-voice, Audio, and Media.
FreeTTS’s developer surface includes pricing, signup flow, support, engineering blog, and 10 more developer resources.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/freetts: open an issue to ask a question, or submit a pull request to add artifacts.
Submit an artifact on GitHub — free →Manage your own listing — the Influence plan, $499/mo →
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}...
name: FreeTTS
aid: freetts
description: '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.'
url: https://raw.githubusercontent.com/api-evangelist/free-tts/refs/heads/main/apis.yml
deliveryModel:
model: saas
open_source: false
commercial: true
callable_host: false
label: Hosted service · you call their endpoint
confidence: medium
source:
- pricing
generated: '2026-08-28'
method: derived
accessModel:
pricing: freemium
onboarding: self-serve
trial: false
try_now: true
public: false
label: Freemium · Self-serve signup
confidence: high
source:
- plans
- authentication
- rate-limits
- security
generated: '2026-09-02'
method: derived
created: '2026-08-28'
modified: '2026-08-28'
specificationVersion: '0.21'
image: https://freetts.org/images/og-image.webp
tags:
- Text-to-Speech
- Speech Synthesis
- AI-voice
- Audio
- Media
- Accessibility
- Speech-to-Text
- Content Creation
- Developer Tools
tags_raw:
- Text-to-Speech
- Speech Synthesis
- AI Voice
- Audio
- Media
- Accessibility
- Speech-to-Text
- Content Creation
- Developer Tools
apis:
- name: FreeTTS REST API
description: '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}, GET /api/srt/{file_id}, GET /api/voices.
Submitted 2026-08-28 from shubham@telenow.ai with a NAME ONLY -- no apis.json, no docs URL, no provider. telenow.ai is
a HubSpot page unrelated to freetts.org, and nothing on freetts.org links the two, so this is a third-party submission.
freetts.org itself is healthy and serves an llms.txt; no apis.json and no OpenAPI resolve. The gate''s own research notes
the backend proxies Microsoft Azure Neural TTS -- recorded as provenance, not as a policy problem: building a product
on Azure TTS is that service''s intended use, unlike the model relays refused this week, which documented redirecting
first-party CLI clients. Verified 2026-08-28.
ENRICHMENT PASS 2026-08-28: contract discovery ran against the API host root, the docs host and every well-known path
and found no machine-readable contract. /openapi.json, /swagger.json, /openapi.yaml, /api-docs, /docs and /redoc all return
the Next.js catch-all 404; /api/openapi.json, /api/v1/openapi.json, /api/docs, /api/redoc and /api/schema all return the
API application''s own JSON 404 {"detail":"Not Found"}, so the FastAPI-style app that serves this API has its interactive
docs and schema routes disabled. No GraphQL, no MCP endpoint, no agent card, no WSDL, no .proto. The endpoint set is larger
than first recorded: POST /api/v1/tts, POST /api/tts-pro (expressive styles, named only in llms.txt, existence confirmed
by a live 405 on GET), GET /api/audio/{file_id}, GET /api/srt/{file_id}, GET /api/voices and an undocumented GET /api/health
returning 200 {"status":"ok","timestamp":<epoch>}. GET /api/voices is fully open - it returned 585,024 bytes and 1,410
voice objects with no credential. The /developers hero markets the API as "No Key Required" while the same page''s FAQ,
all four code samples and the live 401 ({"detail":"Missing x-api-key header"}) require an x-api-key header. Free-tier
limits are published at three different values (10, 15 and 20 requests/minute) and the per-request character cap at two
(1,000 and 5,000) across two of the provider''s own pages, and no rate-limit response headers are emitted at all. The
documented embed widget loader https://freetts.org/widget.js returns 404.'
humanURL: https://freetts.org/developers
baseURL: https://freetts.org/api
tags:
- Text-to-Speech
- Speech Synthesis
- AI-voice
- Audio
- Media
- Accessibility
- Speech-to-Text
- Content Creation
- Developer Tools
tags_raw:
- Text-to-Speech
- Speech Synthesis
- AI Voice
- Audio
- Media
- Accessibility
- Speech-to-Text
- Content Creation
- Developer Tools
properties:
- type: Documentation
url: https://freetts.org/developers
- type: APIReference
url: https://freetts.org/developers#endpoints
- type: GettingStarted
url: https://freetts.org/developers#quickstart
- type: LLMsTxt
url: https://freetts.org/llms.txt
- type: Authentication
url: authentication/freetts-authentication.yml
- type: ErrorCatalog
url: errors/freetts-problem-types.yml
- type: RateLimits
url: rate-limits/freetts-rate-limits.yml
- type: Conventions
url: conventions/freetts-conventions.yml
- type: DataModel
url: data-model/freetts-data-model.yml
- type: JSONSchema
url: json-schema/freetts-voice.json
maintainers:
- FN: FreeTTS
url: https://freetts.org
email: info@freetts.org
generated:
by: apis.io/add
model: claude-opus-4-8
confidence: 85
at: '2026-08-28T07:30:05.533Z'
common:
- type: DomainSecurity
url: security/freetts-domain-security.yml
- type: DeveloperPortal
url: https://freetts.org/developers
- type: Pricing
url: https://freetts.org/pricing
- type: SignUp
url: https://freetts.org/login
- type: TermsOfService
url: https://freetts.org/terms
- type: PrivacyPolicy
url: https://freetts.org/privacy
- type: Support
url: https://freetts.org/contact
- type: Blog
url: https://freetts.org/blog
- type: LLMsTxt
url: llms/freetts-llms.txt
- type: Packages
url: packages/freetts-packages.yml
- type: Plans
url: plans/freetts-plans-pricing.yml
- type: Lifecycle
url: lifecycle/freetts-lifecycle.yml
- type: Conformance
url: conformance/freetts-conformance.yml
- type: Components
url: components/freetts-components.yml
x-enrichment:
date: '2026-08-28'
status: enriched
artifacts_added: 15
pass: local-v1
Kin Score
How this is scored →