Fiddler

Fiddler by Telerik (Progress Software) is a suite of HTTP debugging proxy tools for capturing, inspecting, modifying, and replaying HTTP and HTTPS traffic between computers. The product family includes Fiddler Everywhere (cross-platform), Fiddler Classic (Windows), and Fiddler Jam (browser-based collaboration tool) for API debugging, performance testing, and web development workflows.

Fiddler publishes 3 APIs on the APIs.io network. Tagged areas include API Debugging, HTTP Debugging, HTTP Proxy, Performance Testing, and Traffic Inspection.

Fiddler’s developer surface includes documentation, engineering blog, pricing, support, signup flow, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

26.9/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemium

3 APIs

API DebuggingHTTP DebuggingHTTP ProxyPerformance TestingTraffic InspectionWeb Development

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 26.9/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.0 / 20

Commercial Clarity 12.6 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 6.5 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fiddler: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

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

Rate Limits 1

Documented rate limits and quota policies.

Fiddler Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Get Started 2

Portal, sign-up, and the first successful call

Login

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

Videos

Videos

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 4

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Twitter

Twitter

Other 1

Properties that don't map to a standard resource type

Download

Download

Source (apis.yml)

aid: fiddler
name: Fiddler
description: Fiddler by Telerik (Progress Software) is a suite of HTTP debugging proxy tools for capturing, inspecting, modifying,
  and replaying HTTP and HTTPS traffic between computers. The product family includes Fiddler Everywhere (cross-platform),
  Fiddler Classic (Windows), and Fiddler Jam (browser-based collaboration tool) for API debugging, performance testing, and
  web development workflows.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fiddler.png
tags:
- API Debugging
- HTTP Debugging
- HTTP Proxy
- Performance Testing
- Traffic Inspection
- Web Development
url: https://raw.githubusercontent.com/api-evangelist/fiddler/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-03-26'
specificationVersion: '0.19'
apis:
- aid: fiddler:fiddler-everywhere
  name: Fiddler Everywhere
  description: Fiddler Everywhere is a cross-platform web debugging proxy for macOS, Windows, and Linux. It captures HTTP
    and HTTPS traffic, provides API composition capabilities, and includes collaboration features for team debugging and API
    testing workflows.
  humanURL: https://www.telerik.com/fiddler/fiddler-everywhere
  tags:
  - API Testing
  - Cross Platform
  - HTTP Debugging
  - Traffic Capture
  properties:
  - type: Documentation
    url: https://docs.telerik.com/fiddler-everywhere/introduction
  - type: GettingStarted
    url: https://docs.telerik.com/fiddler-everywhere/get-started/quickstart
  - type: Download
    url: https://www.telerik.com/download/fiddler-everywhere
- aid: fiddler:fiddler-classic
  name: Fiddler Classic
  description: Fiddler Classic is the original free Windows-based HTTP debugging proxy for logging all HTTP and HTTPS traffic
    between a computer and the Internet. It supports traffic inspection, breakpoints, and extensibility through FiddlerScript
    and extensions.
  humanURL: https://www.telerik.com/fiddler/fiddler-classic
  tags:
  - Free Tool
  - HTTP Debugging
  - Traffic Logging
  - Windows
  properties:
  - type: Documentation
    url: https://docs.telerik.com/fiddler/configure-fiddler/tasks/configurefiddler
  - type: Download
    url: https://www.telerik.com/download/fiddler
- aid: fiddler:fiddler-jam
  name: Fiddler Jam
  description: Fiddler Jam is a browser-based troubleshooting solution that enables non-technical users to capture HTTP traffic
    logs and share them with development teams for collaborative debugging of web issues and API problems.
  humanURL: https://www.telerik.com/fiddler/jam
  tags:
  - Browser Extension
  - Collaboration
  - Support
  - Troubleshooting
  properties:
  - type: Documentation
    url: https://docs.telerik.com/fiddler-jam/introduction
common:
- type: VulnerabilityDisclosure
  url: security/fiddler-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/fiddler-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/fiddler-labs
- type: LinkedIn
  url: https://www.linkedin.com/company/fiddler-ai
- type: Website
  url: https://www.telerik.com/fiddler
- type: Documentation
  url: https://docs.telerik.com/fiddler-everywhere/introduction
- type: Blog
  url: https://www.telerik.com/blogs/fiddler
- type: Pricing
  url: https://www.telerik.com/purchase/fiddler
- type: Download
  url: https://www.telerik.com/download/fiddler-everywhere
- type: Support
  url: https://www.telerik.com/support/fiddler-everywhere
- type: Login
  url: https://www.telerik.com/login
- type: Signup
  url: https://www.telerik.com/login#register
- type: Videos
  url: https://www.youtube.com/c/progresssw
- type: Twitter
  url: https://twitter.com/anthropaboroshi
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Fiddler

Kin Score

APIs 3

Fiddler Everywhere

Fiddler Classic

Fiddler Jam

Pricing Plans 1

Fiddler Plans Pricing