Yaak website screenshot

Yaak

Yaak is an open-source desktop API client for organizing and executing REST, GraphQL, WebSockets, Server Sent Events, and gRPC requests. Built with Tauri, Rust, and React, it is a privacy-first, fast desktop client with no telemetry and no cloud lock-in.

Yaak is listed with 1 API on the APIs.io network. Tagged areas include API Client, Clients, Developer Tools, GraphQL, and gRPC.

Yaak’s developer surface includes documentation, engineering blog, and 9 more developer resources.

🌐 Visit website📡 Profile data on GitHub
13.9/100 emerging ▬ flat Agent 28/100 agent aware Front door AI 4/6 moderate Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
AccessFreemium
1 API 1 MCP Servers
API ClientClientsDeveloper ToolsGraphQLgRPCREST

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Composite quality — 13.9/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 4.0 / 17
Access Clarity 1.3 / 17
Operational Transparency 1.2 / 11
Contract Governance 0.0 / 10
Discoverability 5.7 / 9
Regulatory Posture 1.8 / 15
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
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 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 6 / 6
Protected Resource Metadata 5 / 5
Registration Without a Human 6 / 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 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 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/.
Show this score on your site. Kin Score badge preview for Yaak It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/yaak/"><img src="https://apis.io/badge/yaak/card.svg" alt="Yaak on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • 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
  • Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
7 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/yaak/apis.yml: open an issue on github.com/api-evangelist/yaak 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 →

What adopting Yaak moves on the Kin Score 1

Yaak is an area vendor: providers adopt it to run part of their developer surface. This is the Kin Score checks its features can move for a provider that adopts it, what each one really earns, and what it earns nothing for.

api collectionscapability map3 features checked 2026-09-25 · rubric v0.22.0

Yaak is a client for the people calling an API, and nothing it produces is something the Kin Score reads on a provider. It exports a single JSON file of workspaces, not a Postman collection or an OpenAPI document, so postman_present and contract_present are out of reach; its CLI and MCP plugin let agents work in Yaak, not call the provider. The only conditional route is a public repo of Yaak request files declared as examples.

Contract Quality4.0 of 211 pts
CheckEarnsThrough
Published example corpusconditional
Contract QualityOnly if the provider publishes a repo of Yaak request files that covers real calls with real payloads and declares it as Examples; request files are not a contract or a Postman collection.		 4.0 of 4 Filesystem storage and built-in Git
Across 8977 providers that publish a contract, adopting Yaak would move 0. Median lift: composite +0.0 (90th percentile +0.0), agent readiness +0.0 (+0.0). Conditional rows excluded.
What Yaak ships that earns nothing (2)
  • Workspace export — Yaak exports only its own JSON (Postman output needs third-party converters); the check reads Postman-typed pointers only.
  • Agent-friendly CLI and MCP server plugin — The plugin exposes the user’s Yaak workspace to an agent; it is not an MCP server for the provider’s API.

A model, not a score. Adopting this vendor changes a provider's Kin Score only when the provider publishes the resulting artifacts on its own surface; nothing here writes a score, and no sponsorship or partnership can. The rating is not for sale → · Full vendor facets artifact

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.

MarketPositionDepthRegistered MCP serverDeclares compatibility
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers) undeclared - - -

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 6

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.

GraphQL
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified
gRPC
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified
REST
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified
Model Context Protocol (MCP)
measured — observed by APIs.io (verified)
OAuth 2.0 Protected Resource Metadata
measured — observed by APIs.io (verified)
Dynamic Client Registration
measured — observed by APIs.io (published)

APIs 1

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

Yaak

Yaak is an open-source desktop API client for organizing and executing REST, GraphQL, WebSockets, Server Sent Events, and gRPC requests. Built with Tauri, Rust, and React, it is...

MCP Servers 1

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

Yaak MCP Server

Remote MCP server at api.yaak.app over HTTP.

MCP SERVER

GraphQL 1

GraphQL schemas published by this provider.

Yaak GraphQL API

Yaak is an open-source desktop API client for organizing and executing REST, GraphQL, WebSockets, Server Sent Events, and gRPC requests. Built with Tauri, Rust, and React, it is...

GRAPHQL

Yaak API pricing

Not yet checked against Yaak's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

PlanPrice
Free freemium Free
Professional paid Free
Enterprise enterprise —

Plan details, limits and sources →

Rate limits

Compiled by API Evangelist, not yet checked against Yaak's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Yaak Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Yaak Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Yaak Finops

FINOPS

Security Posture 1

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

Yaak Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

VendorFacets
VendorFacets

Source (apis.yml)

apis.yml Raw ↑ 
aid: yaak
name: Yaak
description: Yaak is an open-source desktop API client for organizing and executing REST, GraphQL, WebSockets, Server Sent
  Events, and gRPC requests. Built with Tauri, Rust, and React, it is a privacy-first, fast desktop client with no telemetry
  and no cloud lock-in.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/yaak.png
tags:
- API Client
- Clients
- Developer Tools
- GraphQL
- gRPC
- REST
url: https://raw.githubusercontent.com/api-evangelist/yaak/refs/heads/main/apis.yml
created: '2026-03-16'
modified: '2026-03-27'
specificationVersion: '0.23'
apis:
- aid: yaak:yaak
  name: Yaak
  description: Yaak is an open-source desktop API client for organizing and executing REST, GraphQL, WebSockets, Server Sent
    Events, and gRPC requests. Built with Tauri, Rust, and React, it is a privacy-first, fast desktop client with no telemetry
    and no cloud lock-in.
  humanURL: https://yaak.app
  tags:
  - API Client
  - Clients
  - GraphQL
  - gRPC
  - REST
  properties:
  - type: Documentation
    url: https://yaak.app/docs
  - type: GettingStarted
    url: https://yaak.app/docs
  - url: graphql/yaak-graphql.md
    type: GraphQL
common:
- type: Plans
  url: plans/yaak-plans-pricing.yml
- type: RateLimits
  url: rate-limits/yaak-rate-limits.yml
- type: FinOps
  url: finops/yaak-finops.yml
- type: VendorFacets
  url: vendor-facets/yaak-vendor-facets.yml
- type: DomainSecurity
  url: security/yaak-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/yaak-io
- type: Website
  url: https://yaak.app
- type: Documentation
  url: https://yaak.app/docs
- type: GitHubOrganization
  url: https://github.com/mountain-loop/yaak
- type: LlmsText
  url: https://yaak.app/llms.txt
- url: https://yaak.app/rss.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Yaak API — frequently asked questions

Does Yaak have an API?

Yes. APIs.io lists 1 API from Yaak, including Yaak.

How much does the Yaak API cost?

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

Does Yaak have an MCP server?

Yes. APIs.io lists 1 MCP server for Yaak: Remote MCP server at api.yaak.app over HTTP.

Is the Yaak API ready for AI agents?

Yaak has a Kin Score of 13.9 out of 100 (emerging) and an Agent Readiness score of 28.0 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/yaak"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/yaak/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/yaak/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.