Open-source API client and web debugger for building, testing, and mocking APIs.
Intercepts and modifies network requests, headers, and API responses in real-time.
Offers both a browser extension and a desktop app with collaboration and enterprise security features.

Pros

Free and open-source, offering a cost-effective solution.
Lightweight and fast, designed for quick operations.
Comprehensive features for both API testing and web debugging.
Strong emphasis on security and compliance for enterprise use.
Supports collaboration with team workspaces and Git sync.

Cons

Requires a desktop and desktop browser for full functionality.
Desktop app currently only explicitly mentioned for Mac, implying limited cross-platform desktop support.
May require some learning curve for users accustomed to other API tools.

What is Requestly?

Requestly is an open-source, lightweight API client and web proxy designed for modern developers to build, test, and debug APIs efficiently. It offers both a browser extension for instant, in-browser functionality and a more powerful desktop application for Mac (with other platforms implied) to handle web, mobile, and desktop app API interactions. Beyond just an API client, Requestly functions as a robust HTTP interceptor and web debugger. It allows developers to intercept and modify network requests, headers, and API responses in real-time. This includes injecting custom scripts (JavaScript/CSS), mocking API responses to build frontends without a backend, simulating edge cases, and redirecting requests. It aims to streamline development workflows by providing a comprehensive tool for API development, testing, and debugging, reducing the need to juggle multiple tools. Requestly also emphasizes collaboration and enterprise-readiness with features like team workspaces, Git synchronization for API collections, role-based access control, and robust security measures including SOC-II compliance, SSO, and data encryption. It positions itself as a powerful, open-source alternative to more 'bloated' closed-source solutions, offering a fast, flexible, and secure environment for API development and debugging.

Available on: macOS, Chrome

Data compiled by Toolradar How we evaluate

Source requestly.io

Ratings Across the Web

4.7 (5 reviews)

Requestly holds an aggregate rating of 4.7 out of 5 from 5 reviews across G2, last checked October 18, 2026.

G2 5 reviews

4.7/5

Ratings aggregated from independent review platforms. Learn more

Preview

Key Features

API Client (Rest API Playground)
HTTP Interceptor and Web Debugger
Modify API Responses and Mock Servers
Inject Custom JavaScript and CSS
Pre & Post Request/Response Scripts
GraphQL Support with Schema Introspection
Easy Import/Export (cURL, Postman, OpenAPI)
Environment Variables

Pricing

Freemium

Requestly offers a generous free tier with optional paid upgrades for advanced features.

View pricing

Requestly by the numbers

Toolradar data: It is listed as an alternative to 6 other tools on Toolradar, ranking #2 of 33 in Browser DevTools. As of Oct 2026.

#2 most-listed alternative in Browser DevTools, out of 33 tools in Browser DevTools. Source: Toolradar data, Oct 2026.

Requestly compared with 33 Browser DevTools tools on Toolradar, as of Oct 2026
Metric	Requestly	Peer median	Position (1 is best)
Free plan	Yes	33 of 33 have one	n/a
Listed as an alternative to	6 tools	1	#2 of 33

Each position is counted among the tools that have data for that row, as noted under it. All Browser DevTools data · How we compute this. Advertising and placement fees are not inputs to any position.

Cite this: Toolradar, “Requestly by the numbers”, Oct 2026.

Reviews

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4.7/5

Across 5 verified user reviews on G2

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Best Requestly Alternatives

Top alternatives based on features, pricing, and user needs.

Apidog Freemium

API design, testing, and documentation in one platform

4.8

OWASP ZAP Free

Open-source web application security scanner

4.7

Paw Paid

Native Mac API client for beautiful, powerful API testing

4.5

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Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

Requestly vs Apidog Head-to-head: features, pricing, who wins Requestly vs OWASP ZAP Head-to-head: features, pricing, who wins Requestly vs Paw Head-to-head: features, pricing, who wins

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Requestly FAQ

How does Requestly facilitate collaboration among team members?

Requestly offers team workspaces where members can collaborate on a common set of APIs. It also supports Git Sync, allowing API collections to be kept in sync with a Git repository for version control and collaborative development.

Can Requestly handle GraphQL API testing, and what specific features support this?

Yes, Requestly provides intelligent GraphQL support with features like schema introspection and auto-completion. For debugging, it allows precise response manipulation using operation name filters, which is particularly useful given GraphQL's single-endpoint design.

What security and compliance standards does Requestly adhere to for enterprise users?

Requestly is enterprise-ready with SOC-II compliance, ensuring rigorous security standards for data protection and privacy. It also offers Single Sign-On (SSO) integration and role-based access control for secure, centralized authentication and precise user permission management.

How can developers use Requestly to modify or mock API responses without a backend?

Developers can use Requestly to modify and mock API responses in real-time. This allows them to build frontends without a live backend or simulate API edge cases like missing parameters or incorrect data types, ensuring robust error handling during development.

Does Requestly allow for the injection of custom scripts into web pages?

Yes, Requestly enables users to inject custom JavaScript and CSS snippets onto any webpage without altering the original source code. This feature is useful for testing new features, debugging issues, or personalizing content efficiently, and it supports the execution of multiple scripts simultaneously.

How does Requestly assist in migrating existing API collections from other tools?

Requestly simplifies migration by offering one-click import functionality for API contracts and collections from various sources. Specifically, users can import their Postman Collections and Environments with a single click.

Source: requestly.io

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