Noun Project website screenshot

Noun Project

The Noun Project is a visual language platform providing access to nearly 10 million royalty-free PNG and SVG icons through an OAuth 1.0a-secured REST API. The v2 API supports icon search with style and line-weight filtering, similar-icon lookup, collection browsing, custom recoloring, autocomplete, per-client blocklists, and usage telemetry. Built on AWS, it serves more than 300 million requests per month at 99.99% uptime.

Noun Project is listed with 5 APIs on the APIs.io network, including Autocomplete API, Blocklist API, Collection API, and 2 more. Tagged areas include Icons, SVG, Visual Language, Design Assets, and Public APIs.

The Noun Project catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Noun Project’s developer surface includes authentication, pricing, signup flow, support, engineering blog, and 13 more developer resources.

31.3/100 thin ▬ flat Agent 25/100 agent aware Front door AI 4/6 moderate Heartbeat 50/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
AccessFreemiumOpenFree trial⚡ Free to try
5 APIs
IconsSVGVisual LanguageDesign AssetsPublic APIsDesign

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 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.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):
  • MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
  • 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
  • Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
  • Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
8 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/noun-project/apis.yml: open an issue on github.com/api-evangelist/noun-project 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.

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.

measured — observed by APIs.io (published)

APIs 5

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

Noun Project Autocomplete API

Suggest search terms based on a query prefix.

Noun Project Blocklist API

Manage per-client blocklists for icon IDs, collection IDs, and terms.

Noun Project Collection API

Search and retrieve curated icon collections (icon sets).

Noun Project Icon API

Search, filter, retrieve, and download icons from the Noun Project library.

Noun Project Usage API

Inspect current API key usage against documented quotas.

Open Collections 6

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

Noun Project API V2

OPEN COLLECTION

Noun Project API pricing

Not yet checked against Noun Project's own pricing page. Compiled by API Evangelist on 2026-05-28 from thenounproject.com/api/; confirm before you rely on a figure. A free plan or tier is listed.

PlanPrice
Free Trial freemium Free
Pay-Per-Use usage-based $0.0025 per service call · $0.0095 per icon call
Custom Enterprise enterprise —

Plan details, limits and sources →

Rate limits

Compiled by API Evangelist, not yet checked against Noun Project's documentation. All 12 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Noun Project Rate Limits

12 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

FinOps 1

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

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Noun Project Context

16 classes · 61 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Noun Project — jsonschema rules

5 rules · 4 warnings 1 info

SPECTRAL

Noun Project API Rules

49 rules · 18 errors 24 warnings 7 info

SPECTRAL

JSON Schema 16

Standalone JSON Schema definitions for this provider's data models.

AutocompleteResponse

2 properties

JSON SCHEMA

BlocklistIdRequest

2 properties

JSON SCHEMA

BlocklistResponse

2 properties

JSON SCHEMA

Blocklist

4 properties

JSON SCHEMA

BlocklistTermRequest

2 properties

JSON SCHEMA

CollectionResponse

2 properties

JSON SCHEMA

Collection

13 properties

JSON SCHEMA

CollectionSearchResponse

5 properties

JSON SCHEMA

IconCreator

7 properties

JSON SCHEMA

IconResponse

2 properties

JSON SCHEMA

Icon

25 properties

JSON SCHEMA

IconSearchResponse

5 properties

JSON SCHEMA

Tag

2 properties

JSON SCHEMA

UsageResponse

2 properties

JSON SCHEMA

Usage

3 properties

JSON SCHEMA

UsageWindow

6 properties

JSON SCHEMA

Scroll for all 16

JSON Structure 16

JSON Structure definitions describing this provider's data shapes.

Noun Project Blocklist Response Structure

2 properties

JSON STRUCTURE

Noun Project Blocklist Structure

4 properties

JSON STRUCTURE

Noun Project Collection Response Structure

2 properties

JSON STRUCTURE

Noun Project Collection Structure

13 properties

JSON STRUCTURE

Noun Project Icon Creator Structure

7 properties

JSON STRUCTURE

Noun Project Icon Response Structure

2 properties

JSON STRUCTURE

Noun Project Icon Structure

25 properties

JSON STRUCTURE

Noun Project Tag Structure

2 properties

JSON STRUCTURE

Noun Project Usage Response Structure

2 properties

JSON STRUCTURE

Noun Project Usage Structure

3 properties

JSON STRUCTURE

Noun Project Usage Window Structure

6 properties

JSON STRUCTURE

Scroll for all 16

Examples 16

Example request and response payloads for these APIs.

Noun Project Icon Example

25 fields

EXAMPLE

Noun Project Tag Example

2 fields

EXAMPLE

Scroll for all 16

Security Posture 2

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

Noun Project Authentication

apiKey · 1 scheme

SECURITY

Noun Project Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Noun Project Agentic Access

11 operations · 2 acting

11 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Build 2

SDKs, sample code, and the tooling you integrate with

Access & Security 2

Authentication, authorization, and security posture

Operate 3

Status, limits, changes, and where to get help

Commercial 4

Pricing, plans, and the legal terms of use

Company 2

The organization behind the API

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: noun-project
name: Noun Project
description: The Noun Project is a visual language platform providing access to nearly 10 million royalty-free PNG and SVG
  icons through an OAuth 1.0a-secured REST API. The v2 API supports icon search with style and line-weight filtering, similar-icon
  lookup, collection browsing, custom recoloring, autocomplete, per-client blocklists, and usage telemetry. Built on AWS,
  it serves more than 300 million requests per month at 99.99% uptime.
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: open
  trial: true
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Freemium (free trial) · Open access
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://thenounproject.com/icon.png
url: http://api.thenounproject.com/index.html
humanURL: https://thenounproject.com/api/
baseURL: https://api.thenounproject.com
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-05-28'
x-source: public-apis/public-apis
x-type: company
x-category: Art & Design
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
tags:
- Icons
- SVG
- Visual Language
- Design Assets
- Public APIs
- Design
apis:
- aid: noun-project:noun-project-autocomplete-api
  name: Noun Project Autocomplete API
  description: Suggest search terms based on a query prefix.
  humanURL: https://api.thenounproject.com/documentation.html
  baseURL: https://api.thenounproject.com
  tags:
  - Autocomplete
  properties:
  - type: OpenAPI
    url: openapi/noun-project-autocomplete-api-openapi.yml
  - type: Documentation
    url: https://api.thenounproject.com/documentation.html
  - type: GettingStarted
    url: https://api.thenounproject.com/getting_started.html
  - type: Signup
    url: https://thenounproject.com/developers/apps/
  - type: APIExplorer
    url: https://api.thenounproject.com/explorer
  - type: Authentication
    url: https://api.thenounproject.com/getting_started.html
- aid: noun-project:noun-project-blocklist-api
  name: Noun Project Blocklist API
  description: Manage per-client blocklists for icon IDs, collection IDs, and terms.
  humanURL: https://api.thenounproject.com/documentation.html
  baseURL: https://api.thenounproject.com
  tags:
  - Blacklist
  tags_raw:
  - Blocklist
  properties:
  - type: OpenAPI
    url: openapi/noun-project-blocklist-api-openapi.yml
  - type: Documentation
    url: https://api.thenounproject.com/documentation.html
  - type: GettingStarted
    url: https://api.thenounproject.com/getting_started.html
  - type: Signup
    url: https://thenounproject.com/developers/apps/
  - type: APIExplorer
    url: https://api.thenounproject.com/explorer
  - type: Authentication
    url: https://api.thenounproject.com/getting_started.html
- aid: noun-project:noun-project-collection-api
  name: Noun Project Collection API
  description: Search and retrieve curated icon collections (icon sets).
  humanURL: https://api.thenounproject.com/documentation.html
  baseURL: https://api.thenounproject.com
  tags:
  - Collection
  properties:
  - type: OpenAPI
    url: openapi/noun-project-collection-api-openapi.yml
  - type: Documentation
    url: https://api.thenounproject.com/documentation.html
  - type: GettingStarted
    url: https://api.thenounproject.com/getting_started.html
  - type: Signup
    url: https://thenounproject.com/developers/apps/
  - type: APIExplorer
    url: https://api.thenounproject.com/explorer
  - type: Authentication
    url: https://api.thenounproject.com/getting_started.html
- aid: noun-project:noun-project-icon-api
  name: Noun Project Icon API
  description: Search, filter, retrieve, and download icons from the Noun Project library.
  humanURL: https://api.thenounproject.com/documentation.html
  baseURL: https://api.thenounproject.com
  tags:
  - Icon
  properties:
  - type: OpenAPI
    url: openapi/noun-project-icon-api-openapi.yml
  - type: Documentation
    url: https://api.thenounproject.com/documentation.html
  - type: GettingStarted
    url: https://api.thenounproject.com/getting_started.html
  - type: Signup
    url: https://thenounproject.com/developers/apps/
  - type: APIExplorer
    url: https://api.thenounproject.com/explorer
  - type: Authentication
    url: https://api.thenounproject.com/getting_started.html
- aid: noun-project:noun-project-usage-api
  name: Noun Project Usage API
  description: Inspect current API key usage against documented quotas.
  humanURL: https://api.thenounproject.com/documentation.html
  baseURL: https://api.thenounproject.com
  tags:
  - Usage
  properties:
  - type: OpenAPI
    url: openapi/noun-project-usage-api-openapi.yml
  - type: Documentation
    url: https://api.thenounproject.com/documentation.html
  - type: GettingStarted
    url: https://api.thenounproject.com/getting_started.html
  - type: Signup
    url: https://thenounproject.com/developers/apps/
  - type: APIExplorer
    url: https://api.thenounproject.com/explorer
  - type: Authentication
    url: https://api.thenounproject.com/getting_started.html
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/noun-project/overview
- type: AgenticAccess
  url: agentic-access/noun-project-agentic-access.yml
- type: DomainSecurity
  url: security/noun-project-domain-security.yml
- type: Authentication
  url: authentication/noun-project-authentication.yml
- type: Website
  url: https://thenounproject.com/
- type: Pricing
  url: https://thenounproject.com/api/
- type: Signup
  url: https://thenounproject.com/developers/apps/
- type: Support
  url: https://thenounproject.zendesk.com/
- type: HelpCenter
  url: https://help.thenounproject.com/
- type: GitHubOrganization
  url: https://github.com/TheNounProject
- type: TermsOfService
  url: https://thenounproject.com/legal/api-terms-of-use/
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
- type: Plans
  url: plans/noun-project-plans-pricing.yml
- type: RateLimits
  url: rate-limits/noun-project-rate-limits.yml
- type: FinOps
  url: finops/noun-project-finops.yml
- type: Vocabulary
  url: vocabulary/noun-project-vocabulary.yml
- type: SpectralRules
  url: rules/noun-project-rules.yml
- url: https://blog.thenounproject.com/feed/
  type: Blog
features:
- name: Icon Search
  description: Search nearly 10 million icons by query term, with optional filters for style (solid/line), line weight (1-60
    pixels at 512px rendering), public domain status, and thumbnail size.
- name: Similar Icons
  description: Discover stylistically similar icons by providing a seed icon ID, enabling consistent visual language across
    a project.
- name: Icon Download with Recoloring
  description: Download any icon in SVG or PNG format with a custom hexadecimal color and pixel size (20-1200 for PNG).
- name: Collection Browsing
  description: Search and retrieve curated icon collections (icon sets) with full metadata and member icons.
- name: Autocomplete
  description: Suggest search terms based on a query prefix, returning up to 10 matches.
- name: Per-Client Blocklist
  description: Maintain a per-API-key blocklist of icon IDs, collection IDs, terms, and phrases to filter out unwanted content
    from search results. Blocklist is cached for 10 minutes.
- name: Usage Telemetry
  description: Retrieve current API key usage against hourly, daily, and monthly limits via the /v2/client/usage endpoint.
useCases:
- name: Icon Library Integration
  description: Embed Noun Project's visual language into a design tool, no-code builder, or web/mobile application so end
    users can pick from millions of icons without leaving the host product.
- name: Branded Iconography
  description: Recolor icons to match brand palettes on the fly using the hex color parameter on the download endpoint, eliminating
    per-icon design work.
- name: Style-Consistent Design Systems
  description: Use the more-like-this endpoint to source visually consistent icon sets from a single seed icon, accelerating
    design system curation.
- name: Content Moderation
  description: Apply per-client blocklists to suppress icons that conflict with brand safety, regional, or audience-appropriate
    guidelines.
- name: Educational and Reference Tools
  description: Pair the autocomplete and icon search endpoints to power glossary-style visual references and learning tools.
integrations:
- name: OAuth 1.0a Client Libraries
  description: Compatible with any standards-compliant OAuth 1.0a library, including requests_oauthlib (Python), oauth1 (Node.js),
    Faraday-OAuth (Ruby), DotNetOpenAuth (.NET), and Guzzle OAuth Subscriber (PHP).
- name: Sketch
  description: The provider maintains Sketch plugin tooling (SketchPluginReloader) and historically distributed a Noun Project
    Sketch plugin.
- name: Microsoft Office and Google Workspace
  description: Provider-distributed plugins for Microsoft 365 and Google Slides surface the same icon catalog backed by this
    API.
solutions:
- name: Design Tool Vendors
  description: Power icon pickers, asset browsers, and template galleries inside design, presentation, and document-creation
    tools.
- name: Marketing and Brand Teams
  description: On-demand recoloring of icons to enforce brand palettes across web, print, and presentation assets.
- name: Education Platforms
  description: Add visual reference material to learning content with royalty-free, commercially-licensed icons.
- name: No-Code and Low-Code Builders
  description: Expose a curated icon library to citizen developers building dashboards, portals, and forms.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-tags-removed:
- Art And Design

Noun Project API — frequently asked questions

Does Noun Project have an API?

Yes. APIs.io lists 5 APIs from Noun Project, including Noun Project Autocomplete API, Noun Project Blocklist API and Noun Project Collection API, and 2 more.

Is there an OpenAPI specification for the Noun Project API?

Yes. APIs.io indexes 5 OpenAPI specifications for Noun Project, each linked for download from this page.

How do I authenticate with the Noun Project API?

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

How much does the Noun Project API cost?

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

Is the Noun Project API ready for AI agents?

Noun Project has a Kin Score of 31.3 out of 100 (thin) and an Agent Readiness score of 24.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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