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 is listed with 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 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.7/100 thin ▬ flat Agent 3/100 human only Front door AI 3/6 light Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

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 2026-11-06 · rubric v0.27.0

Composite quality — 27.7/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 4.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.5 / 10

Discoverability 7.3 / 9

Regulatory Posture 2.5 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 23.7 — up to +15.3 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/nuance/apis.yml: open an issue on github.com/api-evangelist/nuance to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Cloud Marketplaces (distribution)	regulated	43.5	-	-
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)	regulated	43.5	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

gRPC

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

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

TLSv1.3 · 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 1

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Conformance

Conformance

Build 5

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

IntegrationEdges

GitHubOrganization

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

ParentCompany

ParentCompany

Source (apis.yml)

aid: nuance
name: Nuance
x-parent: microsoft
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://www.nuance.com
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
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: low
  probe_state: covered
  source:
  - authentication
  - security
  generated: '2026-11-06'
  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
common:
- type: Hosts
  url: hosts/nuance-hosts.yml
- type: IntegrationEdges
  url: integrations/nuance-integration-edges.yml
- type: Vendors
  url: vendors/nuance-vendors.yml
- type: PrivacyPolicy
  url: https://dragon.nuance.com/en-us/privacy-policies.html
- 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.'
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/
  - type: Protobuf
    url: grpc/asr-grpc/nuance/asr/v1/recognizer.proto
  - type: Protobuf
    url: grpc/asr-grpc/nuance/asr/v1beta1/training.proto
  - type: Protobuf
    url: grpc/asr-grpc/nuance/asr/forgetme/v1/forgetme.proto
  aid: nuance:nuance-mix-asraas-grpc-api
- 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
  - gRPC
  tags_raw:
  - Natural Language Understanding
  - NLU
  - gRPC
  properties:
  - type: Documentation
    url: https://docs.nuance.com/mix/apis/nlu-grpc/
  - type: Protobuf
    url: grpc/nlu-grpc/nuance/nlu/v1/runtime.proto
  - type: Protobuf
    url: grpc/nlu-grpc/nuance/nlu/wordset/v1beta1/wordset.proto
  aid: nuance:nuance-mix-nluaas-grpc-api
- 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/
  - type: Protobuf
    url: grpc/dialog-grpc/nuance/dlg/v1/dlg_interface.proto
  aid: nuance:nuance-mix-dlgaas-grpc-api
- 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/
  - type: Protobuf
    url: grpc/tts-grpc/nuance/tts/v1/synthesizer.proto
  - type: Protobuf
    url: grpc/tts-grpc/nuance/tts/storage/v1beta1/storage.proto
  aid: nuance:nuance-mix-ttsaas-grpc-api
- 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/
  aid: nuance:nuance-mix-nraas-grpc-api
x-enrichment:
  date: '2026-11-05'
  status: enriched
  artifacts_added: 41
  pass: local-v6
x-coverage:
  state: covered
  checked: '2026-11-05'
  reason: grpc-contracts
  detail: Nuance Mix publishes its runtime APIs as gRPC services; 41 .proto contracts from docs.nuance.com/mix/apis are saved
    under grpc/. No OpenAPI is published.
  evidence:
  - url: https://docs.nuance.com/mix/apis/asr-grpc/
    status: 200

Nuance API — frequently asked questions

Does Nuance have an API?

Yes. APIs.io lists 5 APIs from Nuance, including Nuance Mix ASRaaS gRPC API, Nuance Mix NLUaaS gRPC API and Nuance Mix DLGaaS gRPC API, and 2 more.

How do I authenticate with the Nuance API?

Nuance uses bearer-token authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Nuance Authentication.

Is the Nuance API ready for AI agents?

Nuance has a Kin Score of 27.7 out of 100 (thin) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-06.

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