Insomnia is an open-source, cross-platform API client owned by Kong Inc. — the company behind the Kong API Gateway. Originally an independent project beloved for its clean, distraction-free interface, Insomnia was acquired by Kong in 2019 and has since evolved into a full API development platform with design, testing, mocking, and CI/CD pipeline capabilities. It is MIT-licensed at its core and available on macOS, Windows, and Linux.
What sets Insomnia apart from Postman is its flexible storage model: you can keep everything 100% local via Local Vault, sync through any third-party Git repository without touching Insomnia's cloud, or use Insomnia Cloud Sync for team collaboration — and mix these per project. This makes it the middle path between Bruno's hard offline-only stance and Postman's default cloud-everything approach. Insomnia is also the strongest tool in this category for GraphQL, with first-class schema introspection, query autocompletion, and explorer built in.
Key Features
Flexible Storage Model — choose Local Vault (fully offline), Git Sync (any third-party Git provider, no cloud), or Cloud Sync per project. Private Environments are always stored locally regardless of project storage choice, so secrets never leave your machine.
Broadest Protocol Support — REST, GraphQL, gRPC, WebSockets, Server-Sent Events (SSE), and SOAP all supported natively, making it the most protocol-complete client in its class.
First-Class GraphQL — schema exploration, autocompletion, and real-time linting make it the preferred choice for GraphQL-heavy teams over both Postman and Bruno.
OpenAPI Design Mode — a dedicated Design tab with real-time OpenAPI spec linting and visual preview lets you design APIs before implementing them, with seamless hand-off to the Debug/Test workflow.
Native Test Suites & Inso CLI — write assertions in JavaScript using Chai.js syntax, run full test suites with a single click or via the
insoCLI, and plug directly into CI/CD pipelines without extra configuration.Mock Servers — create local or cloud-hosted mock servers from design documents to enable parallel frontend-backend development without a live backend.
MCP Client & AI Runner — native MCP client for testing MCP servers, plus an AI Runner that lets developers consume LLMs supported by the Kong AI Gateway directly from within Insomnia.
Plugin Ecosystem — extend functionality with community plugins; the open-source core means custom integrations are straightforward to build and maintain.
Why Choose Insomnia?
Insomnia is the strongest choice for teams that want more flexibility than Bruno's no-cloud stance but a cleaner, lighter experience than Postman's everything-platform approach. It is the go-to for GraphQL-heavy workflows, teams that want Git-native version control without being forced fully offline, and organizations already in the Kong ecosystem. The free Hobby plan covers all core features for unlimited collaborators on one project; paid plans unlock multi-project collaboration, RBAC, and enterprise SSO.
Platform & Compatibility
Architecture
Minimum macOS
macOS Big Sur 11Public Opinion
Curated highlights from Reddit and other communities, not user-submitted reviews.
“A developer who tested Insomnia extensively across three major projects praised its OpenAPI import flow — importing an 847-line YAML spec automatically generated 23 organized requests with proper parameter placeholders, saving roughly two hours of manual setup compared to other tools.”
DevDepth: Insomnia Review
“A Product Hunt reviewer described Insomnia as a must-have in their dev toolkit, highlighting its sleek interface, great environment support, and reliable performance for testing and debugging APIs.”
Product Hunt: Insomnia reviews
“A G2 reviewer praised Insomnia for being easy to install and get started with, and noted it is particularly well-suited for teams working on the Kong API Gateway — with MCP and connectivity features readily available as part of the Kong ecosystem.”
G2: Kong Insomnia Reviews
“A 2026 comparison piece positioned Insomnia as the recommended starting point for most individual developers and small teams — noting the free tier covers everything needed and the Git Sync storage model feels natural for developer teams already using Git for their code.”
The Software Scout: Postman vs Insomnia
“A Product Hunt reviewer recounted losing all their API collections after forgetting their account password — something that never happened when collections were stored locally. They criticized the shift toward mandatory account requirements and forced updates, calling it a shame given Insomnia's previously simple, account-free experience.”
“A G2 reviewer noted that Insomnia currently lacks the natural language AI capabilities found in tools like Postman — specifically, there is no conversational interface for API testing, meaning AI-assisted workflows require switching to another tool.”
“A reviewer noted that while basic environment variables are straightforward, creating dynamic request chains requires learning Nunjucks templating syntax — a non-trivial learning curve compared to Postman's more approachable JavaScript-first scripting model.”
“Multiple comparison sources noted that Insomnia has a smaller community than Postman, fewer ready-made templates and tutorials, and less polished documentation generation — making it a harder sell for non-technical team members or organizations that rely on community resources for onboarding.”
Community
