Listnr website screenshot

Listnr

Listnr AI is a text-to-speech and AI voice platform offering 1,000+ ultra-realistic voices across 142+ languages and accents, used for voiceovers, podcasts, and text-to-video. Beyond the web app, Listnr exposes a documented public Text-to-Speech API (base https://bff.listnr.tech/api/tts/v1) that converts SSML text or article URLs into MP3/WAV audio synchronously or asynchronously, lists available voices, and reports async job status. API keys are generated from the Listnr dashboard at voices.listnr.tech and passed via an x-listnr-token header.

Listnr publishes 3 APIs on the APIs.io network: Jobs API, Text-to-Speech API, and Voices API. Tagged areas include Artificial Intelligence, Text-to-Speech, TTS, Voice, and Speech Synthesis.

Listnr’s developer surface includes authentication, documentation, signup flow, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.9/100 developing ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0
AccessFreemiumSelf serve⚡ Free to try
1 APIs
Artificial IntelligenceText-to-SpeechTTSVoiceSpeech SynthesisAudioVoiceover

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0
Composite quality — 39.9/100 · developing
Contract Quality 12.7 / 23
Developer Ergonomics 5.4 / 18
Access Clarity 8.3 / 18
Operational Transparency 4.0 / 12
Contract Governance 0.0 / 11
Discoverability 6.2 / 9
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 20/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
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/listnr: 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 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Listnr Jobs API

Poll the status of asynchronous conversion jobs.

Listnr Text-to-Speech API

Convert SSML text or an article URL into audio.

Listnr Voices API

List the AI voices available on Listnr.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Listnr Text-to-Speech Jobs API

OPEN COLLECTION

Listnr Jobs Text-to-Speech API

OPEN COLLECTION

Listnr Text-to-Speech Jobs Voices API

OPEN COLLECTION

Listnr Text-to-Speech API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Listnr Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Listnr Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Listnr Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Listnr Authentication

apiKey · 1 scheme

SECURITY

Listnr Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Listnr Agentic Access

6 operations · 4 acting

6 operations · 4 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: listnr
url: https://raw.githubusercontent.com/api-evangelist/listnr/refs/heads/main/apis.yml
name: Listnr
kind: company
description: Listnr AI is a text-to-speech and AI voice platform offering 1,000+ ultra-realistic voices across 142+ languages
  and accents, used for voiceovers, podcasts, and text-to-video. Beyond the web app, Listnr exposes a documented public Text-to-Speech
  API (base https://bff.listnr.tech/api/tts/v1) that converts SSML text or article URLs into MP3/WAV audio synchronously or
  asynchronously, lists available voices, and reports async job status. API keys are generated from the Listnr dashboard at
  voices.listnr.tech and passed via an x-listnr-token header.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - 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
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/listnr.png
tags:
- Artificial Intelligence
- Text-to-Speech
- TTS
- Voice
- Speech Synthesis
- Audio
- Voiceover
tags_raw:
- AI
- Text to Speech
- TTS
- Voice
- Speech Synthesis
- Audio
- Voiceover
created: '2026-07-11'
modified: '2026-07-11'
specificationVersion: '0.23'
apis:
- aid: listnr:listnr-jobs-api
  name: Listnr Jobs API
  description: Poll the status of asynchronous conversion jobs.
  humanURL: https://listnr.ai/text-to-speech-api
  baseURL: https://bff.listnr.tech/api/tts/v1
  tags:
  - Job
  tags_raw:
  - Jobs
  properties:
  - type: OpenAPI
    url: openapi/listnr-jobs-api-openapi.yml
  - type: Documentation
    url: https://listnr.ai/text-to-speech-api
  - type: APIReference
    url: https://github.com/team-listnr/text-to-speech-api
  - type: PostmanCollection
    url: collections/listnr.postman_collection.json
  - type: OpenCollection
    url: collections/listnr.opencollection.json
- aid: listnr:listnr-text-to-speech-api
  name: Listnr Text-to-Speech API
  description: Convert SSML text or an article URL into audio.
  humanURL: https://listnr.ai/text-to-speech-api
  baseURL: https://bff.listnr.tech/api/tts/v1
  tags:
  - Text-to-Speech
  properties:
  - type: OpenAPI
    url: openapi/listnr-text-to-speech-api-openapi.yml
  - type: Documentation
    url: https://listnr.ai/text-to-speech-api
  - type: APIReference
    url: https://github.com/team-listnr/text-to-speech-api
  - type: PostmanCollection
    url: collections/listnr.postman_collection.json
  - type: OpenCollection
    url: collections/listnr.opencollection.json
- aid: listnr:listnr-voices-api
  name: Listnr Voices API
  description: List the AI voices available on Listnr.
  humanURL: https://listnr.ai/text-to-speech-api
  baseURL: https://bff.listnr.tech/api/tts/v1
  tags:
  - Voices
  properties:
  - type: OpenAPI
    url: openapi/listnr-voices-api-openapi.yml
  - type: Documentation
    url: https://listnr.ai/text-to-speech-api
  - type: APIReference
    url: https://github.com/team-listnr/text-to-speech-api
  - type: PostmanCollection
    url: collections/listnr.postman_collection.json
  - type: OpenCollection
    url: collections/listnr.opencollection.json
common:
- type: AgenticAccess
  url: agentic-access/listnr-agentic-access.yml
- type: DomainSecurity
  url: security/listnr-domain-security.yml
- type: Authentication
  url: authentication/listnr-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/listnr
- type: GitHubOrganization
  url: https://github.com/team-listnr
- type: Website
  url: https://listnr.ai
- type: Documentation
  url: https://github.com/team-listnr/text-to-speech-api
- type: SignUp
  url: https://voices.listnr.tech
- type: Plans
  url: plans/listnr-plans-pricing.yml
- type: RateLimits
  url: rate-limits/listnr-rate-limits.yml
- type: FinOps
  url: finops/listnr-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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