calc.engineer

Calc.engineer provides a free in-browser SPICE circuit simulator, PCB autorouter, and 89 engineering calculators covering RF, LoRa, solar, PCB and homelab. It offers an MCP-native REST API for AI agents without signup, aiming to empower engineers with accessible simulation tools.

calc.engineer publishes 9 API contracts indexed on the APIs.io network, including Auth API, Catalog API, Docs API, and 6 more. Tagged areas include Company, Engineering, Simulation, and Calculator.

The calc.engineer catalog on APIs.io includes 1 Spectral governance ruleset.

calc.engineer’s developer surface includes API reference and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.7/100 emerging Agent 20/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 Agent Skills

Company Engineering Simulation Calculator

Kin Score

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

Composite quality — 19.7/100 · emerging

Contract Quality 9.2 / 21

Developer Ergonomics 0.9 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 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 0 / 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/.

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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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 5.4 — up to +18.9 composite points
Contract Quality scores 43.5 — up to +14.1 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/calc-engineer/apis.yml: open an issue on github.com/api-evangelist/calc-engineer 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 →

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 9

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

calc.engineer Auth API

The auth API from calc.engineer — 2 operation(s) for auth.

calc.engineer Catalog API

The catalog API from calc.engineer — 1 operation(s) for catalog.

calc.engineer Docs API

The docs API from calc.engineer — 1 operation(s) for docs.

calc.engineer General API

The general API from calc.engineer — 23 operation(s) for general.

calc.engineer Homelab API

The homelab API from calc.engineer — 13 operation(s) for homelab.

calc.engineer Mesh API

The mesh API from calc.engineer — 10 operation(s) for mesh.

calc.engineer Pcb API

The pcb API from calc.engineer — 14 operation(s) for pcb.

calc.engineer Power API

The power API from calc.engineer — 15 operation(s) for power.

calc.engineer Rf API

The rf API from calc.engineer — 13 operation(s) for rf.

Scroll for all 9

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

calc-engineer-general-logarithm

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

calc.engineer API Rules

40 rules · 35 errors 4 warnings 1 info

SPECTRAL

Security Posture 1

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

Calc Engineer Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Calc Engineer Agentic Access

181 operations · 90 acting · 13 human-in-the-loop

181 operations · 90 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

ErrorCatalog

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: calc-engineer
name: calc.engineer
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://calc.engineer/og.jpg
description: Calc.engineer provides a free in-browser SPICE circuit simulator, PCB autorouter, and 89 engineering calculators
  covering RF, LoRa, solar, PCB and homelab. It offers an MCP-native REST API for AI agents without signup, aiming to empower
  engineers with accessible simulation tools.
url: https://artifacts.apis.io/calc-engineer/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Engineering
- Simulation
- Calculator
tags_raw:
- Company
- Engineering
- Simulation
- Calculator
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/calc-engineer-agentic-access.yml
- type: Spectral
  url: rules/calc-engineer-rules.yml
- type: Vocabulary
  url: vocabulary/calc-engineer-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: ErrorCatalog
  url: errors/calc-engineer-problem-types.yml
- type: Conformance
  url: conformance/calc-engineer-conformance.yml
- type: LLMsTxt
  url: llms/calc-engineer-llms.txt
- type: Hosts
  url: hosts/calc-engineer-hosts.yml
- type: Vendors
  url: vendors/calc-engineer-vendors.yml
- type: APIReference
  url: https://calc.engineer/api/docs
- type: DomainSecurity
  url: security/calc-engineer-domain-security.yml
- type: Website
  url: https://calc.engineer/
apis:
- aid: calc-engineer:calc-engineer-auth-api
  name: calc.engineer Auth API
  description: The auth API from calc.engineer — 2 operation(s) for auth.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - Authentication
  tags_raw:
  - auth
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-auth-api-openapi.yml
- aid: calc-engineer:calc-engineer-catalog-api
  name: calc.engineer Catalog API
  description: The catalog API from calc.engineer — 1 operation(s) for catalog.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - Catalog
  tags_raw:
  - catalog
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-catalog-api-openapi.yml
- aid: calc-engineer:calc-engineer-docs-api
  name: calc.engineer Docs API
  description: The docs API from calc.engineer — 1 operation(s) for docs.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - Docs
  tags_raw:
  - docs
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-docs-api-openapi.yml
- aid: calc-engineer:calc-engineer-general-api
  name: calc.engineer General API
  description: The general API from calc.engineer — 23 operation(s) for general.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags: []
  tags_raw:
  - general
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-general-api-openapi.yml
- aid: calc-engineer:calc-engineer-homelab-api
  name: calc.engineer Homelab API
  description: The homelab API from calc.engineer — 13 operation(s) for homelab.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - Homelab
  tags_raw:
  - homelab
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-homelab-api-openapi.yml
- aid: calc-engineer:calc-engineer-mesh-api
  name: calc.engineer Mesh API
  description: The mesh API from calc.engineer — 10 operation(s) for mesh.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - Mesh
  tags_raw:
  - mesh
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-mesh-api-openapi.yml
- aid: calc-engineer:calc-engineer-pcb-api
  name: calc.engineer Pcb API
  description: The pcb API from calc.engineer — 14 operation(s) for pcb.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - PCB
  tags_raw:
  - pcb
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-pcb-api-openapi.yml
- aid: calc-engineer:calc-engineer-power-api
  name: calc.engineer Power API
  description: The power API from calc.engineer — 15 operation(s) for power.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - Power
  tags_raw:
  - power
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-power-api-openapi.yml
- aid: calc-engineer:calc-engineer-rf-api
  name: calc.engineer Rf API
  description: The rf API from calc.engineer — 13 operation(s) for rf.
  humanURL: https://calc.engineer/api/docs
  baseURL: https://calc.engineer
  tags:
  - RF
  tags_raw:
  - rf
  properties:
  - type: OpenAPI
    url: openapi/calc-engineer-rf-api-openapi.yml
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 19
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

calc.engineer API — frequently asked questions

Does calc.engineer have an API?

Yes. APIs.io lists 9 APIs from calc.engineer, including calc.engineer Auth API, calc.engineer Catalog API and calc.engineer Docs API, and 6 more.

Is there an OpenAPI specification for the calc.engineer API?

Yes. APIs.io indexes 9 OpenAPI specifications for calc.engineer, each linked for download from this page.

Is the calc.engineer API ready for AI agents?

calc.engineer has a Kin Score of 19.7 out of 100 (emerging) and an Agent Readiness score of 20.2 (agent-aware), scored by API Evangelist on 2026-11-06.

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