Insomnia is Kong's open-source desktop API client for designing, debugging, and testing APIs across REST, GraphQL, gRPC, WebSocket, and SSE protocols. It helps developers and API teams move from an OpenAPI spec to tested, mocked, and automated endpoints in one workspace, with storage that can stay local, ride along in Git, or sync through Insomnia's cloud. It serves API developers who want a full design-to-test loop in a desktop client, and platform teams already invested in the Kong ecosystem.[1][2][3]
Quick verdict
Teams that design APIs from OpenAPI specs and need testing, mocking, and CI automation in the same client benefit most from Insomnia. Its unlimited collection runs, Inso CLI with pass/fail exit codes, and local/Git/cloud storage options carry one project from first request to pipeline gate. Teams that need fully offline work with no account, or that will not pay per-seat fees for Git sync and SSO, should choose something else. If spec-driven API work with Kong Konnect integration fits your team, choose Insomnia; if offline-first Git-native simplicity is the requirement, Bruno is the closer fit.[1][2][3][4]
Capabilities
Multi-protocol API client Insomnia sends HTTP/REST, GraphQL, gRPC, WebSocket, SSE, and Socket.io requests from one desktop workspace, covering event-driven and synchronous APIs alike.[1][2]
OpenAPI design-first workflow Engineers design APIs from an OpenAPI spec, preview changes in real time, and call and test the same collection without switching tools.[1][2]
Environments and auth helpers Named environments with variables switch requests between local, staging, and production targets, while authentication helpers and code generation remove repetitive request setup.[1]
Automated testing at scale Unlimited collection runs with pre- and post-request scripting validate complex scenarios and generate dynamic test data on every plan tier.[1]
Inso CLI for CI/CD The command-line runner executes test suites and collections with pass/fail exit codes, lints OpenAPI specs, and exports specs for pipeline automation.[1]
Native API mocking Cloud-hosted mock servers simulate endpoints with dynamic responses derived from collections, specs, prior responses, or plain-language descriptions, within plan quotas.[1][2]
Local, Git, and cloud storage Each project can live in a local vault on the device, sync through a Git repository, or use end-to-end encrypted cloud sync, with a no-login Scratch Pad for quick work.[1][2][3]
AI-native and extensible AI-powered testing assistance, MCP clients connecting collections to Konnect, a plugin system, and the Koh CLI for AI coding agents extend the workspace.[1][2]
Who it fits
Spec-driven API teams keep the OpenAPI contract and its verification together, from first draft through testing and mocking in one client.[1][2]
CI-driven developers can gate pipelines on API collections using the Inso CLI exit codes, spec linting, and collection runs.[1][2]
Kong platform teams benefit from native Konnect integration, MCP clients, and enterprise controls alongside their existing gateways and services.[1]
Boundaries to check
Cloud-first collaboration and account-based sync, with Git Sync beyond three users on paid plans, disappoint developers who want zero-account local work.[1][2]
Scripting, environments, and Git-backed workflows assume developer comfort, so non-technical users get less hand-holding than in a guided no-code client.[1][2]
Pro at $12 and Enterprise at $45 per user per month, with SSO and RBAC gated to paid tiers, add up fast for large teams.[1]
Reported experience
Three G2 Kong Insomnia reviews inspected October 11, 2026: QA Consultant (5/5, March 2026), Technical Project Manager (4.5/5, July 2026), Banking Senior Software Engineer (3.5/5, September 2025).
3 cited community sources. Purposive sample of three inspected G2 reviews; not representative and not independently verified. The five-review 4.6 average comes from a G2 comparison page and is reported as context, not as our own satisfaction score. No Reddit firsthand reports were found. Claims about broader user sentiment are therefore withheld.
The three inspected G2 reports praise a lightweight client that stays fast for everyday REST and GraphQL testing, while the critical report warns that developers arriving from other platforms face a learning curve from UI differences. The comparison-page 4.6 average over five reviews is context, not our own score.[1][2][3]
Migration and automation
Postman v2.0/v2.1 collections and environments import directly alongside OpenAPI, HAR, Swagger, WSDL, and cURL, so evaluating Insomnia does not require rebuilding request libraries from scratch.[1]
Collections execute in automation via the Inso CLI on Windows, macOS, and Linux, matching common desktop and CI environments.[1][2]
How people experience it
Exact excerpt
open source, security and flawless functionality
G2 Kong Insomnia review; reviewer reports using the product, praises open source, security, and functionality.
Exact excerpt
clean, lightweight interface and fast performance
G2 Kong Insomnia review; reviewer praises interface speed and REST/GraphQL testing with environment management.
Exact excerpt
new users are having difficulties
G2 Kong Insomnia critical review; reviewer reports onboarding friction from UI differences versus other platforms.
Questions worth asking
What is the best Insomnia alternative for non-technical users?
Is Insomnia really no-code?
How much does Insomnia cost per month?
Essentials is free at $0 per user per month with unlimited collection runs and environments. Pro costs $12 per user per month and Enterprise costs $45 per user per month, both billed per seat, with mock-server request quotas and a $10 per 25,000-request add-on. Pricing checked October 11, 2026.[1]
Sources and editorial review
Source research. Reviewed on October 11, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.
We have not run or tested this product.
Three G2 Kong Insomnia reviews inspected October 11, 2026: QA Consultant (5/5, March 2026), Technical Project Manager (4.5/5, July 2026), Banking Senior Software Engineer (3.5/5, September 2025). Purposive sample of three inspected G2 reviews; not representative and not independently verified. The five-review 4.6 average comes from a G2 comparison page and is reported as context, not as our own satisfaction score. No Reddit firsthand reports were found. Claims about broader user sentiment are therefore withheld.
- The Collaborative API Development Platform - Insomnia
official · Observed October 11, 2026
Official homepage: AI-native API platform by Kong; REST/GraphQL/gRPC/WSS; design, CLI, mocking, testing, local/Git/cloud storage, MCP, Konnect; free-tier contents; Insomnia 13 GA announcement.
- Pricing - Insomnia
official · Observed October 11, 2026
Official pricing checked October 11, 2026: Essentials $0, Pro $12/user/month, Enterprise $45/user/month; mock quotas and $10/25k add-on; E2EE, RBAC, SSO/SCIM plan gates.
- Insomnia documentation landing
official · Observed October 11, 2026
Official docs: open source desktop app for designing/debugging/testing APIs; auth helpers, codegen, env vars; macOS/Windows/Ubuntu installs; collections, mocks, Inso CLI, Koh CLI, storage modes, RBAC/SSO/SCIM, E2EE, capability matrix.
- Import and export reference for Insomnia
official · Observed October 11, 2026
Official import/export reference: Postman v2.0/v2.1 collection and environment import; Insomnia/HAR/OpenAPI/Swagger/WSDL/cURL formats; inso run test and inso run collection with exit codes; legacy unit tests hidden since 13.3.
- Kong/insomnia - GitHub
official · Observed October 11, 2026
Repository Kong/insomnia: public repo; open-source cross-platform client for GraphQL/REST/WebSockets/SSE/gRPC with Cloud, Local, Git storage; local-custody choice and paid premium capabilities.
- Kong/insomnia LICENSE
official · Observed October 11, 2026
LICENSE file on develop branch is the Apache License, Version 2.0.
- Kong/insomnia root package.json
official · Observed October 11, 2026
Root package.json: Kong author, cross-platform REST client on Electron, Apache-2.0, Node >=24.18, workspaces including insomnia-inso, TypeScript/ESLint/Vitest tooling with React lint plugins.
- Kong Insomnia Reviews - G2 (Yegor L., March 2026)
community · Observed October 11, 2026
G2 review by Yegor L., QA Consultant, March 11, 2026, 5/5: praises open source, security, flawless functionality.
- Kong Insomnia Reviews - G2 (Muhammed A., July 2026)
community · Observed October 11, 2026
G2 review by Muhammed A., Technical Project Manager, July 21, 2026, 4.5/5: clean lightweight interface, fast REST/GraphQL testing, environment management.
- Kong Insomnia Reviews - G2 (Banking engineer, September 2025)
community · Observed October 11, 2026
G2 review by Verified User in Banking, Senior Software Engineer, September 30, 2025, 3.5/5: UI differs from other platforms, new users have difficulties.