SpecFlow website screenshot

SpecFlow

SpecFlow was an open-source BDD (Behavior-Driven Development) testing framework for .NET that allowed teams to write executable specifications in natural language using the Gherkin syntax. Originally developed by TechTalk, it was acquired by Tricentis in 2020 and reached end-of-life on December 31, 2024. The community continuation is Reqnroll, a fork maintaining full backward compatibility.

SpecFlow is listed with 2 APIs on the APIs.io network. Tagged areas include .NET, BDD, Cucumber, Gherkin, and Testing.

The SpecFlow catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

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

13.2/100 emerging ▬ flat Agent 1/100 human only Front door AI 1/6 silent Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →
AccessFreemium
2 APIs 14 Features
.NETBDDCucumberGherkinTesting

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0
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 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 Ask about this →
  • MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
  • Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
  • 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) Ask about this →
  • 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) Ask about this →
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
12 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.
Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →
Ask about:
Specflow · a person reads this and replies by email.
or email info@apis.io
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/specflow/apis.yml: open an issue on github.com/api-evangelist/specflow 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 →

APIs 2

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

SpecFlow

SpecFlow is a BDD framework for .NET that bridges the communication gap between domain experts and developers by enabling natural language specifications (Gherkin) to be execute...

Reqnroll

Reqnroll is the open-source community continuation and fork of SpecFlow, maintaining full backward compatibility while supporting .NET 8.0 and .NET 9.0. Created in 2024 after Tr...

SpecFlow API pricing

Not yet checked against SpecFlow'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 SpecFlow's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

SpecFlow Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Features 14

Notable capabilities this provider offers.

Gherkin Syntax

BDD Scenarios

.NET Integration

NUnit Support

xUnit Support

MSTest Support

Visual Studio Integration

Step Definitions

Scenario Outlines

Data Tables

Hooks

Context Injection

Parallel Execution

Living Documentation

Scroll for all 14

Semantic Vocabularies 1

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

Specflow Context

4 classes · 14 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

SpecFlow — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

SPECTRAL

JSON Schema 2

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

SpecFlow Feature

6 properties

JSON SCHEMA

SpecFlow Scenario

7 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

SpecFlow Feature Structure

0 properties

JSON STRUCTURE

Examples 1

Example request and response payloads for these APIs.

SpecFlow Feature Example

5 fields

EXAMPLE

Security Posture 1

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

SpecFlow Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Build 1

SDKs, sample code, and the tooling you integrate with

Access & Security 1

Authentication, authorization, and security posture

Operate 1

Status, limits, changes, and where to get help

Commercial 2

Pricing, plans, and the legal terms of use

Company 2

The organization behind the API

Other 3

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: specflow
url: https://raw.githubusercontent.com/api-evangelist/specflow/refs/heads/main/apis.yml
name: SpecFlow
description: SpecFlow was an open-source BDD (Behavior-Driven Development) testing framework for .NET that allowed teams to
  write executable specifications in natural language using the Gherkin syntax. Originally developed by TechTalk, it was acquired
  by Tricentis in 2020 and reached end-of-life on December 31, 2024. The community continuation is Reqnroll, a fork maintaining
  full backward compatibility.
type: Index
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - repository-unlicensed
  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: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/specflow.png
access: 3rd-Party
tags:
- .NET
- BDD
- Cucumber
- Gherkin
- Testing
created: '2024-01-01'
modified: '2026-05-02'
position: Consuming
segments:
- Testing
- .NET
apis:
- aid: specflow:specflow
  name: SpecFlow
  tags:
  - .NET
  - BDD
  - Cucumber
  - Gherkin
  - Testing
  humanURL: https://github.com/SpecFlowOSS/SpecFlow
  properties:
  - url: https://github.com/SpecFlowOSS/SpecFlow
    type: GitHubRepo
  - url: https://docs.specflow.org
    type: Documentation
  - url: https://www.nuget.org/packages/SpecFlow/
    type: NuGet
  - url: https://reqnroll.net/
    type: Successor
  description: SpecFlow is a BDD framework for .NET that bridges the communication gap between domain experts and developers
    by enabling natural language specifications (Gherkin) to be executed as automated tests. It supports NUnit, xUnit, and
    MSTest as underlying test runners. Reached end-of-life December 31, 2024; succeeded by the community-driven Reqnroll project.
- aid: specflow:reqnroll
  name: Reqnroll
  tags:
  - .NET
  - BDD
  - Cucumber
  - Gherkin
  - Open Source
  - Testing
  tags_raw:
  - .NET
  - BDD
  - Cucumber
  - Gherkin
  - Open Source
  - Testing
  - Open-Source
  humanURL: https://reqnroll.net/
  properties:
  - url: https://reqnroll.net/
    type: Website
  - url: https://reqnroll.net/documentation/
    type: Documentation
  - url: https://github.com/reqnroll/Reqnroll
    type: GitHubRepo
  - url: https://www.nuget.org/packages/Reqnroll/
    type: NuGet
  description: Reqnroll is the open-source community continuation and fork of SpecFlow, maintaining full backward compatibility
    while supporting .NET 8.0 and .NET 9.0. Created in 2024 after Tricentis announced SpecFlow end-of-life, Reqnroll has over
    5,000 active projects and a growing contributor base.
common:
- type: Plans
  url: plans/specflow-plans-pricing.yml
- type: RateLimits
  url: rate-limits/specflow-rate-limits.yml
- type: FinOps
  url: finops/specflow-finops.yml
- type: ParentCompany
  url: https://apis.io/providers/tricentis/
  name: Tricentis
  x-relationship: acquired
  x-evidence: Originally developed by TechTalk, it was acquired by Tricentis in 2020 and reached end-of-life on December 31,
    2024.
- type: DomainSecurity
  url: security/specflow-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/specflow
- url: https://github.com/SpecFlowOSS/SpecFlow
  name: SpecFlow GitHub Repository
  type: GitHubRepo
  description: 'null'
- url: https://docs.specflow.org
  name: SpecFlow Documentation
  type: Documentation
  description: 'null'
- url: https://www.nuget.org/packages/SpecFlow/
  name: SpecFlow on NuGet
  type: NuGet
  description: 'null'
- url: https://reqnroll.net/
  name: Reqnroll - SpecFlow Successor
  type: Successor
  description: 'null'
- url: https://reqnroll.net/news/2025/01/specflow-end-of-life-has-been-announced/
  name: SpecFlow End-of-Life Announcement
  type: Blog
  description: 'null'
- name: Features
  type: Features
  data:
  - name: Gherkin Syntax
  - name: BDD Scenarios
  - name: .NET Integration
  - name: NUnit Support
  - name: xUnit Support
  - name: MSTest Support
  - name: Visual Studio Integration
  - name: Step Definitions
  - name: Scenario Outlines
  - name: Data Tables
  - name: Hooks
  - name: Context Injection
  - name: Parallel Execution
  - name: Living Documentation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
specificationVersion: '0.23'

SpecFlow API — frequently asked questions

Does SpecFlow have an API?

Yes. APIs.io lists 2 APIs from SpecFlow, including SpecFlow and Reqnroll.

How much does the SpecFlow API cost?

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

Is the SpecFlow API ready for AI agents?

SpecFlow has a Kin Score of 13.2 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-13.

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