Network & API

Free Api Client — MyDevToolsAPI Client on MyDevTools

MyDevTools API Client is a free, offline desktop API client: REST, GraphQL with schema introspection, WebSocket and native gRPC, a local mock server built from saved examples, a collection runner with CSV/JSON data files and JUnit export, pre-request/test scripts (pm.* API), environments and response chaining, OAuth 2.0, AWS SigV4, Hawk, Digest and JWT auth, Postman/OpenAPI/HAR/cURL import, and secrets resolved from an encrypted local vault. No account — a Postman, Insomnia or Bruno alternative.

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About API Client

Offline desktop API client for REST, GraphQL, WebSocket and gRPC with a mock server, collection runner, scripting and vault-backed secrets. Free, no account. Part of MyDevTools — an all-in-one desktop toolkit that runs offline and processes your data locally on your machine.

Common API Client use cases

Use API Client when you need a fast, dedicated way to work with api client. It is useful during API debugging, code reviews, documentation cleanup, test data preparation, and quick checks. Because MyDevTools keeps related utilities together in one offline desktop app, you can move from API Client into nearby tools like formatters, converters, generators, encoders, decoders, and API helpers without leaving the same toolkit.

Example workflow

A typical workflow starts by pasting or typing your input into API Client. Review the result, copy the cleaned or generated output, then continue with a related task such as validating a payload, decoding a token, parsing a URL, generating an identifier, or testing an API request. This makes API Client part of a practical developer workflow instead of a one-off utility page.

Key Features

API Client supports api client workflows in one all-in-one desktop toolkit.
API Client supports http client workflows in one all-in-one desktop toolkit.
API Client supports rest api tester workflows in one all-in-one desktop toolkit.
API Client supports graphql client workflows in one all-in-one desktop toolkit.
API Client supports grpc client workflows in one all-in-one desktop toolkit.
API Client supports websocket client workflows in one all-in-one desktop toolkit.
API Client supports mock server workflows in one all-in-one desktop toolkit.
API Client supports offline api client workflows in one all-in-one desktop toolkit.
Runs offline on your desktop
Free to use, always

API Client FAQ

Is API Client free to use?

Yes. API Client is part of MyDevTools, the all-in-one developer desktop app, and is free to use.

Do I need to install anything for API Client?

API Client is one of 80+ tools in the MyDevTools desktop app. Install MyDevTools once and every tool works offline, with your data processed locally.

What is API Client best for?

What should I use with API Client?

Most developers pair API Client with related MyDevTools utilities such as formatters, parsers, encoders, generators, API tools, and security helpers.

How to Use API Client

01
Open the tool
Open API Client in the MyDevTools desktop app — no account required to start.
02
Enter your data
Paste or type your input directly. Processing happens locally on your device.
03
Copy the result
Get your output instantly. Copy it, download it, or keep working in the same tab.

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Learn

How to Test a REST API Offline Without Postman

Learn how to send API requests, inspect responses, set headers, use authentication tokens, and debug REST endpoints from your desktop with the offline API client in MyDevTools.

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API Client comparisons and alternatives

Postman Alternative — Free Offline Desktop API ClientCompare MyDevTools as a free, offline Postman alternative: REST, GraphQL, WebSocket and gRPC, mock server, collection runner, scripting and vault-backed secrets.MyDevTools vs PostmanCompare MyDevTools with Postman: a free offline desktop API client with REST, GraphQL, WebSocket, gRPC, mock server, runner and scripting versus a cloud API platform.Insomnia Alternative — Free Offline Desktop API ClientCompare MyDevTools with Insomnia: a free, offline desktop API client with REST, GraphQL, WebSocket, gRPC, mock server, runner and vault-backed secrets, plus 80+ developer tools.MyDevTools vs BrunoCompare MyDevTools with Bruno: two open-source desktop API clients. Every MyDevTools feature is free with no paid tier, no account, 27 UI languages and 80+ developer tools in one app.Bruno Alternative — Free Offline API Client with No Paid TierLooking for a Bruno alternative with no Pro tier? MyDevTools is a free, open-source offline desktop API client: REST, GraphQL, WebSocket, gRPC, mock server, runner and vault-backed secrets.