API Specifications

aid: specifications
url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/apis.yml
name: API Specifications
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- API Specifications
- Specification Languages
- API Design
- Contracts
- Schemas
- Interface Definitions
- Standards
description: Meta-index of the specification languages used to describe APIs, events, schemas, and service interfaces across
  the modern API landscape. This repo is the META layer above the topical repos that profile each individual specification
  — it catalogs every major HTTP, event-driven, schema, and service interface specification along with its current version,
  governing body, license, and tooling ecosystem.
created: '2026-05-22'
modified: '2026-05-22'
specificationVersion: '0.19'
apis:
- aid: specifications:openapi
  name: OpenAPI Specification (OAS)
  description: The OpenAPI Specification (formerly Swagger) is the dominant industry standard for describing HTTP-based RESTful
    APIs. OAS describes endpoints, operations, parameters, request/response schemas, authentication, and examples in a machine-
    and human-readable format. The active versions are 3.0.x and 3.1.0 (which is fully aligned with JSON Schema 2020-12).
    OpenAPI is governed by the OpenAPI Initiative, a Linux Foundation project, under the Apache 2.0 license.
  humanURL: https://www.openapis.org/
  baseURL: https://spec.openapis.org/oas/latest.html
  tags:
  - OpenAPI
  - REST
  - HTTP
  - Specification Language
  - OpenAPI Initiative
  - Linux Foundation
  properties:
  - type: Documentation
    url: https://learn.openapis.org/
  - type: Specification
    url: https://spec.openapis.org/oas/latest.html
    title: OpenAPI Specification (latest)
  - type: Specification
    url: https://spec.openapis.org/oas/v3.1.0
    title: OpenAPI 3.1.0
  - type: Specification
    url: https://spec.openapis.org/oas/v3.0.3
    title: OpenAPI 3.0.3
  - type: GitHubRepository
    url: https://github.com/OAI/OpenAPI-Specification
  - type: GitHubOrganization
    url: https://github.com/OAI
    title: OpenAPI Initiative GitHub Organization
  - type: Governance
    url: https://www.openapis.org/about
    title: OpenAPI Initiative / Linux Foundation
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
    title: Apache 2.0
  - type: Tools
    url: https://tools.openapis.org/
    title: OpenAPI Tools Directory
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/json-schema/specification-record-schema.json
    title: Specification Record Schema
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/openapi-example.json
    title: OpenAPI Specification Record Example
- aid: specifications:asyncapi
  name: AsyncAPI Specification
  description: AsyncAPI is the open standard for describing event-driven and message-driven APIs across protocols such as
    Kafka, AMQP, MQTT, WebSocket, NATS, and SNS/SQS. AsyncAPI 3.0 (December 2023) decoupled operations from channels, enabling
    clearer modelling of pub/sub, request/reply, and streaming patterns. AsyncAPI is governed by the AsyncAPI Initiative under
    the Linux Foundation, distributed under the Apache 2.0 license.
  humanURL: https://www.asyncapi.com/
  baseURL: https://www.asyncapi.com/docs/reference/specification/latest
  tags:
  - AsyncAPI
  - Event-Driven
  - Messaging
  - Streaming
  - Specification Language
  - Linux Foundation
  properties:
  - type: Documentation
    url: https://www.asyncapi.com/docs
  - type: Specification
    url: https://www.asyncapi.com/docs/reference/specification/latest
    title: AsyncAPI Specification (latest)
  - type: Specification
    url: https://www.asyncapi.com/docs/reference/specification/v3.0.0
    title: AsyncAPI 3.0.0
  - type: GitHubOrganization
    url: https://github.com/asyncapi
  - type: GitHubRepository
    url: https://github.com/asyncapi/spec
  - type: Governance
    url: https://www.asyncapi.com/community
    title: AsyncAPI Initiative / Linux Foundation
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
    title: Apache 2.0
  - type: Tools
    url: https://www.asyncapi.com/tools
    title: AsyncAPI Tools
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/asyncapi-example.json
    title: AsyncAPI Specification Record Example
- aid: specifications:json-schema
  name: JSON Schema
  description: JSON Schema is a declarative language for annotating and validating JSON documents. It is the foundational
    schema language for most modern API specifications (OpenAPI 3.1, AsyncAPI 3, and others embed it directly). The current
    stable dialect is Draft 2020-12. Governance is moving toward a chartered standards body (JSON Schema Foundation), with
    the IETF as the historical sponsor; reference implementations and tooling are MIT and BSD-licensed.
  humanURL: https://json-schema.org/
  baseURL: https://json-schema.org/draft/2020-12
  tags:
  - JSON Schema
  - Validation
  - Schema
  - IETF
  - Specification Language
  properties:
  - type: Documentation
    url: https://json-schema.org/learn/getting-started-step-by-step
  - type: Specification
    url: https://json-schema.org/draft/2020-12/release-notes
    title: JSON Schema Draft 2020-12 Release Notes
  - type: Specification
    url: https://json-schema.org/draft/2020-12/json-schema-core
    title: JSON Schema Core (2020-12)
  - type: GitHubOrganization
    url: https://github.com/json-schema-org
  - type: GitHubRepository
    url: https://github.com/json-schema-org/json-schema-spec
  - type: Governance
    url: https://json-schema.org/specification
    title: JSON Schema Specification Governance
  - type: License
    url: https://opensource.org/license/bsd-3-clause
    title: BSD-3-Clause (reference tooling)
  - type: Tools
    url: https://json-schema.org/tools
    title: JSON Schema Tooling Ecosystem
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/json-schema-example.json
    title: JSON Schema Specification Record Example
- aid: specifications:json-structure
  name: JSON Structure
  description: JSON Structure is an emerging open specification that extends and complements JSON Schema with a clearer, more
    code-generation-friendly type system designed for data contracts and modeling. It introduces structural primitives intended
    for cross-language model generation. The project is community-driven and Apache 2.0 licensed.
  humanURL: https://json-structure.org/
  baseURL: https://json-structure.org/meta/core/v0/
  tags:
  - JSON Structure
  - Schema
  - Data Modeling
  - Code Generation
  - Specification Language
  properties:
  - type: Documentation
    url: https://json-structure.org/
  - type: Specification
    url: https://json-structure.org/meta/core/v0/
    title: JSON Structure Core Meta-Schema v0
  - type: GitHubRepository
    url: https://github.com/json-structure/specification
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
    title: Apache 2.0
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/json-structure-example.json
    title: JSON Structure Specification Record Example
- aid: specifications:graphql
  name: GraphQL SDL
  description: GraphQL is a query language and runtime for APIs, defined by the GraphQL Specification. The GraphQL Schema
    Definition Language (SDL) is the declarative format used to define types, queries, mutations, and subscriptions on a GraphQL
    server. The spec is governed by the GraphQL Foundation, a Linux Foundation project, under the OWFa 1.0 license. The current
    spec edition is the October 2021 release with continued Working Drafts.
  humanURL: https://graphql.org/
  baseURL: https://spec.graphql.org/
  tags:
  - GraphQL
  - SDL
  - Query Language
  - Schema
  - GraphQL Foundation
  - Linux Foundation
  properties:
  - type: Documentation
    url: https://graphql.org/learn/
  - type: Specification
    url: https://spec.graphql.org/October2021/
    title: GraphQL Specification (October 2021)
  - type: Specification
    url: https://spec.graphql.org/draft/
    title: GraphQL Specification (Working Draft)
  - type: GitHubOrganization
    url: https://github.com/graphql
  - type: GitHubRepository
    url: https://github.com/graphql/graphql-spec
  - type: Governance
    url: https://graphql.org/foundation/
    title: GraphQL Foundation
  - type: License
    url: https://www.openwebfoundation.org/the-agreements/the-owf-1-0-agreements-granted-claims/owfa-1-0
    title: OWFa 1.0
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/graphql-example.json
    title: GraphQL Specification Record Example
  - url: graphql/specifications-graphql.md
    type: GraphQL
- aid: specifications:grpc-protobuf
  name: gRPC and Protocol Buffers
  description: gRPC is a high-performance RPC framework using HTTP/2 and Protocol Buffers (Protobuf) as its IDL and wire format.
    Service definitions are written in .proto files. gRPC is a CNCF graduated project; Protocol Buffers (proto2/proto3, with
    proto editions emerging) are maintained by Google. Both are Apache 2.0 / BSD-3-Clause licensed.
  humanURL: https://grpc.io/
  baseURL: https://protobuf.dev/
  tags:
  - gRPC
  - Protobuf
  - Protocol Buffers
  - RPC
  - CNCF
  - Specification Language
  properties:
  - type: Documentation
    url: https://grpc.io/docs/
  - type: Documentation
    url: https://protobuf.dev/programming-guides/proto3/
    title: Protocol Buffers Language Guide (proto3)
  - type: Specification
    url: https://protobuf.dev/reference/protobuf/proto3-spec/
    title: Protocol Buffers proto3 Specification
  - type: GitHubOrganization
    url: https://github.com/grpc
  - type: GitHubOrganization
    url: https://github.com/protocolbuffers
  - type: GitHubRepository
    url: https://github.com/grpc/grpc
  - type: GitHubRepository
    url: https://github.com/protocolbuffers/protobuf
  - type: Governance
    url: https://www.cncf.io/projects/grpc/
    title: gRPC at CNCF
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
    title: Apache 2.0
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/grpc-protobuf-example.json
    title: gRPC / Protobuf Specification Record Example
- aid: specifications:smithy
  name: Smithy
  description: Smithy is an open-source IDL and code-generation framework for defining services and SDKs, created and maintained
    by AWS. It is protocol-agnostic (HTTP REST, AWS JSON, MQTT, RPC), supports traits-based modeling, and is used to generate
    AWS service SDKs, OpenAPI, and JSON Schema. Smithy is Apache 2.0 licensed.
  humanURL: https://smithy.io/
  baseURL: https://smithy.io/2.0/
  tags:
  - Smithy
  - AWS
  - IDL
  - Service Definition
  - Specification Language
  properties:
  - type: Documentation
    url: https://smithy.io/2.0/quickstart.html
  - type: Specification
    url: https://smithy.io/2.0/spec/index.html
    title: Smithy 2.0 Specification
  - type: GitHubOrganization
    url: https://github.com/smithy-lang
  - type: GitHubRepository
    url: https://github.com/smithy-lang/smithy
  - type: Governance
    url: https://github.com/smithy-lang
    title: Smithy maintained by Smithy-Lang / AWS
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
    title: Apache 2.0
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/smithy-example.json
    title: Smithy Specification Record Example
- aid: specifications:typespec
  name: TypeSpec
  description: TypeSpec (formerly Cadl) is a language for describing API shapes developed by Microsoft. TypeSpec definitions
    emit OpenAPI 3.x, JSON Schema, Protobuf, and other artifacts, and serve as the upstream source for Azure SDK generation.
    TypeSpec is MIT licensed and maintained on GitHub under the microsoft organization.
  humanURL: https://typespec.io/
  baseURL: https://typespec.io/docs
  tags:
  - TypeSpec
  - Microsoft
  - IDL
  - API Design
  - Specification Language
  properties:
  - type: Documentation
    url: https://typespec.io/docs
  - type: Specification
    url: https://typespec.io/docs/language-basics/overview
    title: TypeSpec Language Reference
  - type: GitHubRepository
    url: https://github.com/microsoft/typespec
  - type: GitHubOrganization
    url: https://github.com/microsoft
    title: Microsoft GitHub (governing org)
  - type: Governance
    url: https://github.com/microsoft/typespec/blob/main/GOVERNANCE.md
    title: TypeSpec Governance
  - type: License
    url: https://opensource.org/license/mit
    title: MIT
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/typespec-example.json
    title: TypeSpec Specification Record Example
- aid: specifications:raml
  name: RAML (RESTful API Modeling Language)
  description: RAML is a YAML-based modelling language for RESTful APIs, originally created by Mulesoft. RAML 1.0 (2016) is
    the current stable specification. RAML governance has effectively converged with Mulesoft / Salesforce, and the broader
    industry has shifted toward OpenAPI; RAML remains in use across legacy Mulesoft / Anypoint stacks. Spec licensed under
    Apache 2.0.
  humanURL: https://raml.org/
  baseURL: https://github.com/raml-org/raml-spec
  tags:
  - RAML
  - REST
  - Mulesoft
  - Legacy
  - Specification Language
  properties:
  - type: Documentation
    url: https://raml.org/developers/raml-100-tutorial
  - type: Specification
    url: https://github.com/raml-org/raml-spec/blob/master/versions/raml-10/raml-10.md
    title: RAML 1.0 Specification
  - type: GitHubOrganization
    url: https://github.com/raml-org
  - type: GitHubRepository
    url: https://github.com/raml-org/raml-spec
  - type: Governance
    url: https://raml.org/about-raml
    title: RAML Workgroup (stewarded by Mulesoft/Salesforce)
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
    title: Apache 2.0
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/raml-example.json
    title: RAML Specification Record Example
- aid: specifications:api-blueprint
  name: API Blueprint
  description: API Blueprint is a Markdown-based specification language for describing web APIs, originally created by Apiary
    (acquired by Oracle). The spec is MIT licensed but development effectively stalled after Oracle's acquisition of Apiary;
    it is documented here for completeness as historical context for the API specification landscape.
  humanURL: https://apiblueprint.org/
  baseURL: https://github.com/apiaryio/api-blueprint
  tags:
  - API Blueprint
  - Markdown
  - Legacy
  - Historical
  - Specification Language
  properties:
  - type: Documentation
    url: https://apiblueprint.org/documentation/tutorial.html
  - type: Specification
    url: https://github.com/apiaryio/api-blueprint/blob/master/API%20Blueprint%20Specification.md
    title: API Blueprint Specification
  - type: GitHubOrganization
    url: https://github.com/apiaryio
  - type: GitHubRepository
    url: https://github.com/apiaryio/api-blueprint
  - type: License
    url: https://opensource.org/license/mit
    title: MIT
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/api-blueprint-example.json
    title: API Blueprint Specification Record Example
- aid: specifications:wsdl-soap
  name: WSDL / SOAP
  description: The Web Services Description Language (WSDL) is the historical XML-based interface definition language for
    SOAP web services. WSDL 1.1 (2001) is the most widely deployed version; WSDL 2.0 is a W3C Recommendation (2007). SOAP
    and WSDL are governed by the W3C and remain critical in legacy enterprise and government integrations. Documented here
    as the historical baseline for service interface specifications.
  humanURL: https://www.w3.org/TR/wsdl/
  baseURL: https://www.w3.org/TR/wsdl20/
  tags:
  - WSDL
  - SOAP
  - W3C
  - XML
  - Legacy
  - Historical
  - Specification Language
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/wsdl20-primer/
  - type: Specification
    url: https://www.w3.org/TR/wsdl/
    title: WSDL 1.1 Note (W3C, 2001)
  - type: Specification
    url: https://www.w3.org/TR/wsdl20/
    title: WSDL 2.0 Recommendation (W3C, 2007)
  - type: Specification
    url: https://www.w3.org/TR/soap12-part1/
    title: SOAP 1.2 Recommendation (W3C)
  - type: Governance
    url: https://www.w3.org/groups/wg/ws-desc/
    title: W3C Web Services Description Working Group
  - type: License
    url: https://www.w3.org/copyright/document-license-2023/
    title: W3C Document License
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/wsdl-soap-example.json
    title: WSDL / SOAP Specification Record Example
- aid: specifications:json-rpc
  name: JSON-RPC 2.0
  description: JSON-RPC 2.0 is a stateless, light-weight remote procedure call (RPC) protocol encoded in JSON. It is widely
    used in blockchain/Web3 APIs (Ethereum, Bitcoin), IDE language servers (LSP), and developer tooling. The 2.0 specification
    (2010) is the stable revision, maintained by the JSON-RPC Working Group. Released into the public domain.
  humanURL: https://www.jsonrpc.org/
  baseURL: https://www.jsonrpc.org/specification
  tags:
  - JSON-RPC
  - RPC
  - JSON
  - Specification Language
  properties:
  - type: Documentation
    url: https://www.jsonrpc.org/
  - type: Specification
    url: https://www.jsonrpc.org/specification
    title: JSON-RPC 2.0 Specification
  - type: Governance
    url: https://www.jsonrpc.org/
    title: JSON-RPC Working Group
  - type: License
    url: https://creativecommons.org/publicdomain/zero/1.0/
    title: Public Domain / CC0
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/json-rpc-example.json
    title: JSON-RPC Specification Record Example
- aid: specifications:tinybird
  name: Tinybird API Spec
  description: The Tinybird API specification is a vendor-defined, declarative format for describing analytics endpoints (pipes),
    data sources, and parameters backed by ClickHouse. It is documented here as a representative example of vendor-specific
    specification formats that govern modern data API products outside of the OpenAPI/AsyncAPI mainline. Maintained by Tinybird;
    SDKs and CLI are MIT licensed.
  humanURL: https://www.tinybird.co/docs
  baseURL: https://www.tinybird.co/docs/api-reference
  tags:
  - Tinybird
  - Analytics
  - Vendor Specification
  - Data API
  - Specification Language
  properties:
  - type: Documentation
    url: https://www.tinybird.co/docs
  - type: APIReference
    url: https://www.tinybird.co/docs/api-reference
    title: Tinybird API Reference
  - type: GitHubOrganization
    url: https://github.com/tinybirdco
  - type: Governance
    url: https://www.tinybird.co/
    title: Tinybird (vendor-governed)
  - type: License
    url: https://opensource.org/license/mit
    title: MIT (SDKs / CLI)
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/examples/tinybird-example.json
    title: Tinybird API Spec Record Example
common:
- type: Website
  url: https://github.com/api-evangelist/specifications
- type: GitHubRepository
  url: https://github.com/api-evangelist/specifications
- type: JSONSchema
  url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/json-schema/specification-record-schema.json
  title: Specification Record JSON Schema
- type: JSONStructure
  url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/json-structure/specification-record-structure.json
  title: Specification Record JSON Structure
- type: JSONLD
  url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/json-ld/specifications-context.jsonld
  title: API Specifications JSON-LD Context
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/specifications/refs/heads/main/vocabulary/specifications-vocabulary.yml
  title: API Specifications Vocabulary
- type: Features
  data:
  - name: HTTP Request/Response Specifications
    description: Languages for describing synchronous HTTP APIs — paths, methods, parameters, request bodies, responses, and
      security. Includes OpenAPI, RAML, API Blueprint, and historically WSDL.
  - name: Event-Driven Specifications
    description: Languages for describing message-driven and event-driven APIs across brokers and protocols. Primarily AsyncAPI
      3.x, plus protocol-specific schemas (Avro, Protobuf) used in concert.
  - name: Service Interface Definition Languages (IDLs)
    description: Languages that define language-agnostic service contracts intended for code generation across clients and
      servers. Includes gRPC/Protobuf, Smithy, TypeSpec, and historically WSDL.
  - name: Schema Languages
    description: Languages for describing data shapes independent of a specific transport. Includes JSON Schema (the de facto
      standard, embedded in OpenAPI and AsyncAPI) and the emerging JSON Structure.
  - name: RPC Protocol Specifications
    description: Specifications for remote procedure call protocols. Includes JSON-RPC 2.0 (used heavily in blockchain and
      LSP) and gRPC for high-performance RPC.
  - name: Vendor-Defined Specifications
    description: Vendor-specific specification formats that govern modern API products (e.g. Tinybird pipes). These often
      emit OpenAPI as a derived artifact while keeping a higher-level domain model as the source of truth.
- type: UseCases
  data:
  - name: Specification Discovery and Cataloging
    description: Maintaining an enterprise inventory of specifications used across internal and partner APIs, mapped to their
      governing bodies and tooling.
  - name: Multi-Format Code Generation
    description: Choosing or layering specifications (TypeSpec or Smithy as a high-level model emitting OpenAPI, JSON Schema,
      and Protobuf) to generate SDKs across protocols.
  - name: Event-Driven Architecture Contracts
    description: Using AsyncAPI alongside Avro/Protobuf to define event schemas, channels, and operations for streaming and
      message-driven systems.
  - name: Governance and Linting Across Specs
    description: Applying Spectral or other linting frameworks against OpenAPI, AsyncAPI, and JSON Schema artifacts as part
      of an API governance program.
  - name: Legacy SOAP/WSDL Modernization
    description: Migrating legacy WSDL/SOAP interfaces to OpenAPI-described REST or gRPC service contracts as part of modernization
      initiatives.
- type: Integrations
  data:
  - name: Spectral
    description: Open-source linting engine (Stoplight) for OpenAPI, AsyncAPI, and JSON Schema. The de facto governance engine
      across HTTP and event-driven specs.
  - name: Redocly CLI
    description: Open-source CLI for linting, bundling, and rendering OpenAPI specs; enforces style guides and integrates
      with CI.
  - name: AsyncAPI Generator
    description: Template-driven code and documentation generator for AsyncAPI specs across languages and brokers.
  - name: Protoc / Buf
    description: The canonical Protobuf compiler and Buf's modern toolchain for linting, breaking-change detection, and code
      generation against .proto files.
  - name: Smithy CLI
    description: AWS-maintained CLI for compiling Smithy models and generating OpenAPI, JSON Schema, and SDK artifacts.
  - name: TypeSpec Compiler
    description: Microsoft-maintained compiler that emits OpenAPI 3, JSON Schema, Protobuf, and other artifacts from TypeSpec
      sources.
- type: GitHubOrganization
  url: https://github.com/OAI
  title: OpenAPI Initiative
- type: GitHubOrganization
  url: https://github.com/asyncapi
  title: AsyncAPI Initiative
- type: GitHubOrganization
  url: https://github.com/json-schema-org
  title: JSON Schema Organization
- type: GitHubOrganization
  url: https://github.com/json-structure
  title: JSON Structure Organization
- type: GitHubOrganization
  url: https://github.com/graphql
  title: GraphQL Foundation
- type: GitHubOrganization
  url: https://github.com/grpc
  title: gRPC (CNCF)
- type: GitHubOrganization
  url: https://github.com/protocolbuffers
  title: Protocol Buffers
- type: GitHubOrganization
  url: https://github.com/smithy-lang
  title: Smithy-Lang (AWS)
- type: GitHubOrganization
  url: https://github.com/microsoft
  title: Microsoft (TypeSpec)
- type: GitHubOrganization
  url: https://github.com/raml-org
  title: RAML Workgroup
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com