Insomnia vs REST Assured
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
From $12 per user/month (Pro; ~17% off billed annually)
Free tierFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
Free for small teams; Pro lifts the user cap and adds RBAC, and Enterprise at $45 per user/month adds SSO/SCIM and Kong Konnect integration.
Free and open source. You pay in engineering time and CI minutes.
Free tier
Essentials is free for up to 3 users, including local and cloud projects, CLI and 1,000 mock requests a month.
Everything, self-hosted
Open source
Apache-2.0
Apache-2.0
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
Kong · since 2016
Widely used
OSS community · since 2010
Strengths
- Noticeably faster and lighter than Postman for everyday request work.
- Best-in-class GraphQL and gRPC ergonomics.
- Design-first OpenAPI workflow with linting built in.
- API tests live in the codebase, versioned and reviewed with the service.
- Readable given/when/then chains that map directly onto HTTP semantics.
- Full access to Java for setup, data and assertions.
Limitations
- A forced-account change in 2023 damaged trust; check the current model before standardising on it.
- Test scripting is less capable than Postman's.
- Smaller ecosystem of shared collections.
- Java only, and requires developers rather than manual testers.
- No GUI, so exploratory request work needs a separate client.
- Verbose for very large payload assertions.
Best for
Developers who mainly want a fast client with excellent GraphQL support.
JVM teams that want API tests in the same repository as the service.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.