Symbl.ai

Symbl.ai is a conversation-intelligence platform for understanding and generating insights from human conversations across voice, video, and text. Its developer platform exposed Async, Streaming, and Telephony APIs plus the Nebula LLM for real-time speech-to-text and conversational insights — action items, topics, questions, follow-ups, sentiment, and custom trackers — with first-party SDKs for JavaScript, Web (browser), Python, and Go. Symbl.ai was acquired by Invoca (announced 2025-05-28) and the standalone developer platform is decommissioned: api.symbl.ai, docs.symbl.ai, platform.symbl.ai, nebula.symbl.ai and integrations.symbl.ai all fail to resolve in DNS as of 2026-08-14, so no endpoint is callable and no account can be created. What survives is real and public — the open-sourced documentation repository (github.com/symblai/symbl-docs), first-party Postman workspaces, the client SDKs on npm, PyPI and pkg.go.dev (newest release 2024-11-18), and the live marketing, blog, pricing and SOC 2 / HIPAA / PCI / GDPR compliance pages.

Symbl.ai is profiled on the APIs.io network. Tagged areas include Company, Conversation Intelligence, Speech-to-Text, Voice AI, and Artificial Intelligence.

Symbl.ai’s developer surface includes engineering blog, pricing, support, documentation, changelog, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

35.1/100 thin ▬ flat Agent 3/100 human only Front door AI 6/6 dominant Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumOpen⚡ Free to try

0 APIs

Company Conversation Intelligence Speech-to-Text Voice AI Artificial Intelligence Machine Learning Real-Time SDK

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 35.1/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 6.1 / 17

Access Clarity 11.6 / 17

Operational Transparency 5.5 / 11

Contract Governance 1.9 / 10

Discoverability 4.7 / 9

Regulatory Posture 2.7 / 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 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics 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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

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
Developer Ergonomics scores 35.7 — up to +12.9 composite points
Contract Governance scores 18.2 — up to +9.8 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/symblai/apis.yml: open an issue on github.com/api-evangelist/symblai 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
Hugging Face Hub Organisations	builds-on	29.2	-	-

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.

Symbl.ai API pricing

Prices published by Symbl.ai. A free plan or tier is listed.

Plan	Price
Free	Free
PayG	—
Enterprise	—

Plan details, limits and sources →

Rate limits

Streaming API: 5 concurrent
Streaming API: 50 concurrent
Streaming API: 2 concurrent

All 8 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Symblai Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Symblai Rate Limits

8 limits

RATE LIMITS

Security Posture 2

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

Symblai Domain Security

TLSv1.3 · DMARC

SECURITY

Symblai Trust Center

SOC 2 Type II, HIPAA, PCI DSS, GDPR, CSA CAIQ

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Components

Components

Lifecycle

Lifecycle

Conformance

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

Postman

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Compliance

Compliance

TrustCenter

TrustCenter

Operate 3

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: symblai
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: open
  trial: false
  try_now: true
  public: true
  label: Freemium · Open access
  confidence: medium
  probe_state: none
  source:
  - plans
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/symblai.png
name: Symbl.ai
description: 'Symbl.ai is a conversation-intelligence platform for understanding and generating insights from human conversations
  across voice, video, and text. Its developer platform exposed Async, Streaming, and Telephony APIs plus the Nebula LLM for
  real-time speech-to-text and conversational insights — action items, topics, questions, follow-ups, sentiment, and custom
  trackers — with first-party SDKs for JavaScript, Web (browser), Python, and Go. Symbl.ai was acquired by Invoca (announced
  2025-05-28) and the standalone developer platform is decommissioned: api.symbl.ai, docs.symbl.ai, platform.symbl.ai, nebula.symbl.ai
  and integrations.symbl.ai all fail to resolve in DNS as of 2026-08-14, so no endpoint is callable and no account can be
  created. What survives is real and public — the open-sourced documentation repository (github.com/symblai/symbl-docs), first-party
  Postman workspaces, the client SDKs on npm, PyPI and pkg.go.dev (newest release 2024-11-18), and the live marketing, blog,
  pricing and SOC 2 / HIPAA / PCI / GDPR compliance pages.'
url: https://raw.githubusercontent.com/api-evangelist/symblai/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- techstars
x-tier: stub
x-tier-reason: portfolio-lead
x-enrichment:
  date: '2026-08-14'
  status: enriched
  artifacts_added: 7
  pass: local-v1
x-coverage:
  state: none
  reason: no-developer-program
  detail: Symbl.ai's developer program no longer exists — api.symbl.ai, docs.symbl.ai, platform.symbl.ai, nebula.symbl.ai
    and integrations.symbl.ai were all removed from DNS after the Invoca acquisition, so there is no endpoint to call and
    the Sign-up button on the still-live pricing page points at a host that does not resolve.
  evidence:
  - url: https://api.symbl.ai/
    status: 0
  - url: https://docs.symbl.ai/
    status: 0
  - url: https://platform.symbl.ai/#/signup
    status: 0
  - url: https://symbl.ai/openapi.json
    status: 404
  - url: https://symbl.ai/company/pricing/
    status: 200
  checked: '2026-08-14'
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-14'
tags:
- Company
- Conversation Intelligence
- Speech-to-Text
- Voice AI
- Artificial Intelligence
- Machine Learning
- Real-Time
- SDK
tags_raw:
- Company
- Conversation Intelligence
- Speech to Text
- Voice AI
- Artificial Intelligence
- Machine Learning
- Real Time
- SDKs
- Machine-Learning
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://symbl.ai/
- type: DeveloperPortal
  url: https://symbl.ai/developers/
- type: Blog
  url: https://symbl.ai/developers/blog/
- type: GitHubOrganization
  url: https://github.com/symblai
- type: Pricing
  url: https://symbl.ai/company/pricing/
- type: Support
  url: https://symbl.ai/service-and-support/support/support-plans/
- type: TermsOfService
  url: https://symbl.ai/termsofservice/
- type: PrivacyPolicy
  url: https://symbl.ai/privacy-policy/
- type: Packages
  url: packages/symblai-packages.yml
- type: SDKs
  url: packages/symblai-packages.yml
- type: Components
  url: components/symblai-components.yml
- type: DomainSecurity
  url: security/symblai-domain-security.yml
- type: LLMsTxt
  url: llms/symblai-llms.txt
- type: Documentation
  url: https://github.com/symblai/symbl-docs
- type: Postman
  url: https://www.postman.com/symbldotai/workspace/symbl-ai/overview
- type: Lifecycle
  url: lifecycle/symblai-lifecycle.yml
- type: ChangeLog
  url: changelog/symblai-changelog.yml
- type: Plans
  url: plans/symblai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/symblai-rate-limits.yml
- type: Conformance
  url: conformance/symblai-conformance.yml
- type: Compliance
  url: conformance/symblai-conformance.yml
- type: TrustCenter
  url: security/symblai-trust-center.yml

Symbl.ai API — frequently asked questions

How much does the Symbl.ai API cost?

APIs.io lists 3 pricing plans for Symbl.ai, with each plan's price, limits and inclusions under Pricing on this page.

Is the Symbl.ai API ready for AI agents?

Symbl.ai has a Kin Score of 35.1 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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