Insomnia
Replaceable in one session with an AI coding agent.
An API client for REST, GraphQL and gRPC with a design tab for OpenAPI specifications, plus cloud sync of your collections across machines.
Keep collections as files, and lint the specification in CI. STACK - Bruno for the collections, Spectral for the specification, both in the repository COLLECTIONS - One directory per service, one file per request, committed - Environments as separate files, with secrets read from the environment and never written down THE SPECIFICATION - A single OpenAPI file as the source of truth - Spectral with a ruleset in the repository, run in CI: every operation needs a description, an operationId and a documented error response - Fail the build on a rule violation, so the specification cannot rot GENERATED FROM IT - The client types, the mock server and the documentation all generated from that one file - Nothing hand-written twice GRPC AND WEBSOCKETS - grpcurl and websocat cover both from a shell script; there is no need for a graphical client Include the ruleset, the generation step and the CI job.
What you lose
- gRPC and WebSocket support in the same client as REST, which few alternatives cover
- Cloud sync and team sharing of collections
- An OpenAPI design view with linting against your own rules
If you would rather not build
- Hoppscotch, self-hosted
The escape hatch
open source · no votes, no paid placement
Why this verdict
our own opinion · changed only by a person
78/100
Verdict yes at 78. A linted OpenAPI file in CI does more for an API than any client, and it removes the reason to sync collections at all.
History
tracked since 10 Aug 2026 · nothing is ever overwritten
Nothing recorded yet. This chart fills in once the page has visitors, votes or prompt copies — it will not draw a flat line to look busy.
Questions about Insomnia
answered from the record above
Is Insomnia free?
No — the plan we track is $12 a month. Individual at around $12 per user per month billed monthly, cheaper annually; a free tier exists.
Can you replace Insomnia by building your own?
YES. Replaceable in one session with an AI coding agent. Replacement score 78 out of 100, build time one session. Read what you lose before you decide.
How much does Insomnia cost?
$12 a month on Individual — $144 a year. Recorded 10 Aug 2026.
What do you lose by replacing Insomnia?
gRPC and WebSocket support in the same client as REST, which few alternatives cover; Cloud sync and team sharing of collections; An OpenAPI design view with linting against your own rules. If any of those carry weight for you, keep paying.
Is there an open-source alternative to Insomnia?
Yes: Bruno, Spectral. The prompt on this page is for when you want it your way instead.
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