Nuance

Nuance Communications (NASDAQ: NUAN) is a conversational-AI and speech-recognition pioneer, acquired by Microsoft in 2022. Its self-service developer platform, Nuance Mix, provides tooling and runtime services for building conversational applications: Automatic Speech Recognition (ASRaaS), Natural Language Understanding (NLUaaS), Dialog management (DLGaaS), Text-to-Speech (TTSaaS) and grammar-based recognition (NRaaS) — all exposed as gRPC/protobuf runtime services secured with OAuth 2.0 client-credentials. Design-time tooling (Mix.nlu, Mix.dialog) and a first-party CLI (@nuance-mix/mix-cli) round out the platform. Nuance also ships Dragon speech solutions, including Dragon Medical SpeechKit for healthcare voice capture.

Nuance publishes 5 APIs on the APIs.io network. Tagged areas include Company, Speech Recognition, Conversational AI, Natural Language Understanding, and Text to Speech.

Nuance’s developer surface includes documentation, API reference, getting-started guide, signup flow, authentication, CLI, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
26.8/100 emerging ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
5 APIs 1 MCP Servers
CompanySpeech RecognitionConversational AINatural Language UnderstandingText to SpeechSpeech SynthesisVoiceDialoggRPCHealthcare AI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 26.8/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 13.5 / 20
Commercial Clarity 2.6 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 21/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/nuance: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

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

Nuance Mix ASRaaS gRPC API

Automatic Speech Recognition as a Service — convert speech to text in real time over a gRPC streaming API (Recognizer service), with wordsets, training and ForgetMe operations. ...

Nuance Mix NLUaaS gRPC API

Natural Language Understanding as a Service — interpret user input against NLU models built in Mix.nlu, over a gRPC Runtime service.

Nuance Mix DLGaaS gRPC API

Dialog as a Service — execute conversational dialog flows authored in Mix.dialog over a gRPC Dialog service.

Nuance Mix TTSaaS gRPC API

Text-to-Speech as a Service — turn text into synthesized speech (including neural voices) over a gRPC Synthesizer service.

Nuance Mix NRaaS gRPC API

Grammar-based recognition as a Service — grammar-driven speech recognition over a gRPC runtime service.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

nuance-mcp.yml

MCP SERVER

Security Posture 2

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

Nuance Authentication

oauth2 · 1 scheme

SECURITY

Nuance Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Conformance
Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: nuance
name: Nuance
description: 'Nuance Communications (NASDAQ: NUAN) is a conversational-AI and speech-recognition pioneer, acquired by Microsoft
  in 2022. Its self-service developer platform, Nuance Mix, provides tooling and runtime services for building conversational
  applications: Automatic Speech Recognition (ASRaaS), Natural Language Understanding (NLUaaS), Dialog management (DLGaaS),
  Text-to-Speech (TTSaaS) and grammar-based recognition (NRaaS) — all exposed as gRPC/protobuf runtime services secured with
  OAuth 2.0 client-credentials. Design-time tooling (Mix.nlu, Mix.dialog) and a first-party CLI (@nuance-mix/mix-cli) round
  out the platform. Nuance also ships Dragon speech solutions, including Dragon Medical SpeechKit for healthcare voice capture.'
url: https://raw.githubusercontent.com/api-evangelist/nuance/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://github.com/nuance-communications.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- mayfield
x-tier: profiled
x-tier-reason: enriched-from-public-developer-surface
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Speech Recognition
- Conversational AI
- Natural Language Understanding
- Text to Speech
- Speech Synthesis
- Voice
- Dialog
- gRPC
- Healthcare AI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Nuance Mix ASRaaS gRPC API
  description: Automatic Speech Recognition as a Service — convert speech to text in real time over a gRPC streaming API (Recognizer
    service), with wordsets, training and ForgetMe operations. Secured with OAuth 2.0 client-credentials.
  humanURL: https://docs.nuance.com/mix/apis/asr-grpc/
  baseURL: https://mix.nuance.com
  tags:
  - Speech Recognition
  - Speech to Text
  - gRPC
  properties:
  - type: Documentation
    url: https://docs.nuance.com/mix/apis/asr-grpc/
- name: Nuance Mix NLUaaS gRPC API
  description: Natural Language Understanding as a Service — interpret user input against NLU models built in Mix.nlu, over
    a gRPC Runtime service.
  humanURL: https://docs.nuance.com/mix/apis/nlu-grpc/
  baseURL: https://mix.nuance.com
  tags:
  - Natural Language Understanding
  - NLU
  - gRPC
  properties:
  - type: Documentation
    url: https://docs.nuance.com/mix/apis/nlu-grpc/
- name: Nuance Mix DLGaaS gRPC API
  description: Dialog as a Service — execute conversational dialog flows authored in Mix.dialog over a gRPC Dialog service.
  humanURL: https://docs.nuance.com/mix/apis/dialog-grpc/
  baseURL: https://mix.nuance.com
  tags:
  - Conversational AI
  - Dialog
  - gRPC
  properties:
  - type: Documentation
    url: https://docs.nuance.com/mix/apis/dialog-grpc/
- name: Nuance Mix TTSaaS gRPC API
  description: Text-to-Speech as a Service — turn text into synthesized speech (including neural voices) over a gRPC Synthesizer
    service.
  humanURL: https://docs.nuance.com/mix/apis/tts-grpc/
  baseURL: https://mix.nuance.com
  tags:
  - Text to Speech
  - Speech Synthesis
  - gRPC
  properties:
  - type: Documentation
    url: https://docs.nuance.com/mix/apis/tts-grpc/
- name: Nuance Mix NRaaS gRPC API
  description: Grammar-based recognition as a Service — grammar-driven speech recognition over a gRPC runtime service.
  humanURL: https://docs.nuance.com/mix/apis/nr-grpc/
  baseURL: https://mix.nuance.com
  tags:
  - Speech Recognition
  - Grammars
  - gRPC
  properties:
  - type: Documentation
    url: https://docs.nuance.com/mix/apis/nr-grpc/
common:
- type: DomainSecurity
  url: security/nuance-domain-security.yml
- type: Website
  url: https://www.nuance.com
- type: DeveloperPortal
  url: https://mix.nuance.com
- type: Documentation
  url: https://docs.nuance.com/mix/
- type: APIReference
  url: https://docs.nuance.com/mix/apis/
- type: GettingStarted
  url: https://github.com/nuance-communications/mix-quickstart-projects
- type: GitHubOrganization
  url: https://github.com/nuance-communications
- type: SignUp
  url: https://mix.nuance.com
- type: Authentication
  url: authentication/nuance-authentication.yml
- type: Packages
  url: packages/nuance-packages.yml
- type: SDKs
  url: packages/nuance-packages.yml
- type: CLI
  url: cli/nuance-cli.yml
- type: Conventions
  url: conventions/nuance-conventions.yml
- type: Conformance
  url: conformance/nuance-conformance.yml
- type: MCPServer
  url: mcp/nuance-mcp.yml
- type: LLMsTxt
  url: llms/nuance-llms.txt
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 9
  pass: local-v1