Postman vs Insomnia in 2025: Which API Client Should Developers Use?

In late 2023, Insomnia’s parent company, Kong, announced that it would require user accounts and cloud sync for the free version of the tool. The backlash was immediate and loud. Within days, a fork called Bruno appeared, and thousands of developers publicly reconsidered their API client choices for the first time in years. Two years later, the dust has largely settled—but the question of Postman versus Insomnia is more interesting than ever, because both tools have changed significantly.

Here’s where each one stands in 2025, and how to decide which belongs in your workflow.

The State of Play in 2025

Postman remains the market leader by a wide margin. It’s used by more than 30 million developers according to Postman’s own figures, and it has evolved from a simple HTTP client into a full API platform: design, documentation, testing, mocking, monitoring, and governance. Its enterprise footprint is substantial, particularly in organizations with dedicated QA and platform teams.

Insomnia (now branded “Insomnia by Kong”) has settled into a niche. After the 2023 account controversy, Kong walked back some of the strictest requirements and eventually open-sourced the core client under the MIT license in 2024. Insomnia today is a leaner, more focused tool—excellent at what it does, but with a smaller ecosystem than Postman.

A third player worth acknowledging: Bruno, the open-source, offline-first client that emerged from the Insomnia backlash. It’s not the subject of this comparison, but its existence has pushed both Postman and Insomnia to emphasize local-first workflows and data portability.

Interface and Day-to-Day Usability

Postman’s interface is dense. A typical workspace includes collections, environments, a request builder, a response viewer, tabs for tests and scripts, and a sidebar that can show history, collections, or the API catalog. For newcomers, this is overwhelming; for power users, it’s a productivity engine. The learning curve is real, but the payoff is a tool that can handle nearly any API workflow without leaving the app.

Insomnia takes a simpler approach. The layout is cleaner, requests open in tabs, and the mental model is straightforward: environments on one side, requests in the middle, responses below. Many developers find it faster to get started with, especially for ad-hoc testing or debugging a single endpoint.

Verdict: Insomnia wins on simplicity; Postman wins on depth. If you spend more time in the client than in your IDE, Postman’s density becomes an asset. If you just need to poke an endpoint, Insomnia’s minimalism is a relief.

Collaboration and Team Features

This is where the gap is widest.

Postman’s collaboration story is mature. Shared workspaces, collection-level permissions, comments, change history, and API versioning are all built in. Postman also offers a public API Network, letting teams publish and discover APIs. For organizations where API collections are shared artifacts—reviewed, versioned, and maintained like code—Postman’s tooling is hard to match.

Insomnia offers team workspaces and cloud sync, but its collaboration features are more limited. There’s no equivalent to Postman’s API Network or the same depth of governance controls. For solo developers or small teams, this is fine. For a 50-person engineering org that needs role-based access and audit trails, Insomnia will feel thin.

Verdict: Postman, decisively, for teams.

Testing and Automation

Postman’s testing capabilities are substantial. You can write JavaScript-based tests using the pm API, chain requests with pre-request scripts, run collections via the Collection Runner or Newman (the CLI), and integrate with CI/CD pipelines. Postman also offers monitoring—scheduled collection runs that alert you when an API breaks—and mock servers generated from your API schema.

Insomnia supports scripting too, using its own plugin and template tag system, and it can run request chains. But its testing ecosystem is smaller, its scripting API is less documented, and there’s no first-party equivalent to Newman or Postman Monitors. Insomnia’s CLI (inso) exists and supports CI integration, but the community and documentation around it are thinner.

Verdict: Postman, especially if API testing is part of your CI/CD pipeline.

Pricing in 2025

Both tools have free tiers, and both have moved more features behind paid plans over time.

  • Postman Free covers basic usage with limits on collection runs and collaboration. Postman Basic is around $14 per user per month (billed annually), and Professional is around $29 per user per month. Enterprise pricing is custom.
  • Insomnia Free covers most individual use. Insomnia Pro is around $12 per user per month, and Enterprise is custom.

Prices change, so check current rates, but the pattern is clear: Insomnia is somewhat cheaper, while Postman charges more for its broader platform. For individuals, both free tiers are workable. For teams, the cost difference is real but usually secondary to feature fit.

Data Ownership and the Local-First Question

The 2023 Insomnia controversy wasn’t really about accounts—it was about control. Developers who had stored years of API collections locally suddenly faced a tool that wanted their data in the cloud.

Both companies have responded. Insomnia open-sourced its core client and improved local storage options. Postman, meanwhile, has long supported local workspaces and export/import of collections in open formats. Neither tool is fully offline-first in the way Bruno is, but both now respect that many developers want their data on their own machines.

If data sovereignty is a hard requirement—regulated industries, air-gapped environments—neither Postman nor Insomnia is the obvious answer. Bruno or a similar offline-first client may be the better fit. But for most teams, both tools now offer acceptable local options.

Ecosystem and Integrations

Postman’s ecosystem is vast: integrations with GitHub, GitLab, Jenkins, Slack, Datadog, and dozens of others; a public API Network; extensive documentation; and a large community producing tutorials and shared collections. When you hit a problem, someone has probably solved it and posted about it.

Insomnia’s ecosystem is smaller but respectable. It supports OpenAPI import/export, GraphQL, gRPC, and WebSockets, and its plugin system allows customization. But the community is quieter, and third-party integrations are fewer.

Verdict: Postman, by a wide margin.

So Which Should You Use?

There’s no universal answer, but the decision tree is fairly clear.

Choose Postman if:

  • You work on a team that shares and versions API collections
  • API testing and CI/CD integration are core to your workflow
  • You need monitoring, mocking, or API documentation generation
  • You value a large ecosystem and community support
  • You’re willing to accept a steeper learning curve and higher per-seat cost

Choose Insomnia if:

  • You’re a solo developer or on a small team
  • You want a clean, fast interface for ad-hoc API testing
  • You prefer a lighter tool with less platform overhead
  • Cost per seat matters and you don’t need Postman’s broader features
  • You work primarily with GraphQL, gRPC, or WebSockets and want solid support without the rest of Postman’s platform

Consider Bruno or similar tools if:

  • Offline-first and local data ownership are non-negotiable
  • You want a Git-native workflow for API collections
  • You’re in a regulated or air-gapped environment

The Takeaway

Postman and Insomnia are no longer competing for the same user. Postman has become an API platform—broad, collaborative, and enterprise-ready, with the pricing and complexity that entails. Insomnia has become a focused, lighter client that does the core job well without asking for as much.

The right choice depends less on which tool is “better” and more on how you work. If your API client is a shared team artifact and a testing pipeline component, Postman earns its cost. If it’s a personal tool for exploring and debugging endpoints, Insomnia’s simplicity is a feature, not a limitation. And if data ownership is your priority, the 2023 controversy that reshaped this market is a reminder that the best tool is the one that fits your constraints—not the one with the most features.