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 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

24.9/100 emerging ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessSelf serve

5 APIs

Company Speech Recognition Conversational AI Natural Language Understanding Text-to-Speech Speech Synthesis Voice Dialog gRPC Healthcare AI

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 24.9/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 2.2 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.5 / 10

Discoverability 6.9 / 9

Regulatory Posture 3.2 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 0 / 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

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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/nuance: 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 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.

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

X-MCPServerCandidate

X-MCPServerCandidate

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

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

ParentCompany

ParentCompany

Source (apis.yml)

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
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: 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: '0.23'
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
tags_raw:
- 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
  tags_raw:
  - 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
  tags_raw:
  - 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: ParentCompany
  url: https://apis.io/providers/microsoft/
  name: Microsoft
  x-relationship: acquired
  x-evidence: 'Nuance Communications (NASDAQ: NUAN) is a conversational-AI and speech-recognition pioneer, acquired by Microsoft
    in 2022.'
- 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: X-MCPServerCandidate
  url: mcp/nuance-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/nuance-llms.txt
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 9
  pass: local-v1

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