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Insomnia

Insomnia is an API client and development platform website for REST, GraphQL, gRPC, SOAP, WebSockets, API design, testing, mocking, collections, and collaboration.

Official site
insomnia.rest is the main public website for Insomnia.
Core use
Developers use Insomnia to send API requests, organize collections, inspect responses, design APIs, test behavior, and collaborate on API workflows.
Protocol coverage
The official site describes Insomnia as supporting HTTP, REST, GraphQL, gRPC, SOAP, and WebSockets.
Insomnia helps developers design, debug, test, mock, and collaborate on APIs across REST, GraphQL, gRPC, SOAP, WebSockets, and related workflows.View logo on Insomnia

Who is Insomnia?

Insomnia official site presents Insomnia as a collaborative API development platform. It is best known as an API client for developers who need to design, debug, test, mock, and document API behavior across several protocols and team workflows.

API client workflows

An API client lets developers send requests, change headers and bodies, inspect responses, save examples, and repeat tests without writing one-off scripts each time. Insomnia supports this everyday debugging loop while also organizing work into collections and projects that can be shared or maintained over time.

REST, GraphQL, gRPC, SOAP, and WebSockets

Modern API work is not limited to one protocol. Insomnia's public positioning names HTTP, REST, GraphQL, gRPC, SOAP, and WebSockets, which makes it useful for teams that need a common client across different service styles. Each protocol brings different request shapes, response formats, and debugging habits.

Design, mocking, and testing

Insomnia is more than a send-button interface. The product and docs describe workflows for API specs, design, mock servers, environments, tests, plugins, and local or synced storage. These features help teams move from exploring a single endpoint to maintaining a repeatable API development process.

Collections and collaboration

Collections group related API requests, environments, variables, and examples so teams can reuse work instead of recreating requests from memory. Collaboration features matter when backend engineers, QA, product teams, support, and developer relations all need to understand the same API behavior.

Who uses Insomnia

Insomnia is relevant to backend engineers, full-stack developers, API platform teams, QA engineers, developer relations, support engineers, and teams building or consuming APIs. It is especially useful when API behavior must be explored quickly but later preserved as shared knowledge.

Limits and interpretation

An API client can reveal how an API behaves, but it does not replace API design discipline. Teams still need clear contracts, examples, authentication guidance, error messages, test coverage, documentation, and release communication. Saved requests are helpful, but they should be curated so collections do not become noisy archives.

Why it matters

APIs are easier to build and support when developers can reproduce behavior quickly. Insomnia matters because it turns repeated API exploration into shareable requests, tests, mocks, and project knowledge that can travel across a team.

WHOIS domain data

Data pulled: May 23, 2026View current WHOIS record

Domain
insomnia.rest
IP address
76.76.21.21
Registrar
Tucows Domains Inc.
WHOIS server
whois.tucows.com
Referral URL
www.tucowsdomains.com
Created
December 13, 2014
Updated
November 12, 2025
Expires
December 13, 2026
Nameservers
ns-cloud-e1.googledomains.com (216.239.32.110); ns-cloud-e2.googledomains.com (216.239.34.110); ns-cloud-e3.googledomains.com (216.239.36.110); ns-cloud-e4.googledomains.com (216.239.38.110)
Domain status
clientUpdateProhibited; clientTransferProhibited
Contact privacy
Registrant contact is listed as Contact Privacy Inc. Customer 0139001841 in Toronto, ON, CA.