If you've been building APIs for more than a few years, you've watched the API testing tool landscape go through some uncomfortable changes. Postman got bigger and heavier. Insomnia got acquired and suddenly required an account. And somewhere in the middle of all that corporate repositioning, a new tool called Bruno showed up and quietly built a following.
In 2026, the question of which API testing tool to use isn't as obvious as it was in 2019 when Postman was clearly the answer for everyone. Let's look at what's actually worth using.
Postman: the industry standard that got heavy
Postman is still the most widely used API testing tool in the industry. It's what gets taught in bootcamps, what enterprise teams standardize on, and what comes up first when you search for API testing tools. That widespread adoption means Postman has real advantages: everyone knows how to use it, it integrates with everything, and the community resources are extensive.
The product has grown significantly over the years. What started as a simple HTTP client is now a platform with API documentation, mock servers, API monitoring, a public API network (you can publish your API specs for others to use), built-in testing with JavaScript assertions, and enterprise governance features. It's genuinely comprehensive.
But comprehensive comes with a cost. Postman is heavy. On a mid-range laptop, the app takes 4-6 seconds to start. It uses significant memory even for basic usage. The interface has layers of menus, workspaces, environments, and configurations that feel overwhelming if you just want to send an HTTP request and look at the response.
The 2023 account requirement was the change that pushed a lot of developers to look at alternatives. Before that change, you could use Postman without creating an account and your collections were stored locally. After the change, saving and syncing collections requires a Postman account. Your data goes to Postman's cloud. For developers working on sensitive APIs or at companies with data residency requirements, this was a problem.
Postman's free tier is still functional. You get unlimited API requests, basic workspace features, and up to 3 users in a workspace. The Pro plan at $14/month per user adds mock server calls, monitoring, more collaboration features, and higher API call limits.
For teams that need collaboration, shared collections, and API monitoring in one place, Postman still makes sense. The breadth of features is genuinely useful at scale.
Insomnia: the cleaner alternative that got complicated
Insomnia started as the clean, focused alternative to Postman. Simpler UI, faster startup, better GraphQL support, and originally free and open source. For a while it was the clear recommendation for developers who found Postman too heavy.
Then Kong (the API gateway company) acquired Insomnia in 2019, and in 2023 they made a change that angered the community: Insomnia started requiring account creation and cloud login to use the app. Local-only mode was removed. Your collections had to sync to Kong's cloud. The backlash was significant enough that many developers immediately migrated to Bruno.
Kong has since walked back some of the changes. A local "Scratch Pad" mode was re-added for basic usage without full account sync. The current version (Insomnia 9.x) gives you a local scratch pad for quick testing and a full account-based mode for collection management. It's workable but the trust damage from the forced cloud sync decision lingers.
The free tier still exists and covers individual use. Insomnia's UI remains genuinely cleaner than Postman's. The GraphQL experience is still excellent, with proper schema introspection, query building with autocomplete, and clean visualization of responses. For gRPC, Insomnia also has better built-in support than Postman.
The honest assessment: Insomnia is worth considering if you do a lot of GraphQL work and the Kong cloud account requirement doesn't bother you. For general REST API testing, the controversy around their data practices is hard to ignore when Bruno exists as an alternative.
Bruno: the tool that's doing it right
Bruno is the new-generation API client that emerged directly from the backlash against Postman and Insomnia's cloud-first direction. It's open source, completely offline-first, and stores your API collections as files in your filesystem.
That last point is more significant than it sounds. When you create a collection in Bruno, it creates a folder on your filesystem with .bru files inside. Each request is a plain text file. Your entire API collection can live in your project's Git repository, right next to your code. Version control for API collections isn't an afterthought; it's built into how Bruno works.
The implications for development workflow are real. You can see exactly what changed in an API collection with git diff. You can review API changes in pull requests alongside code changes. You can check out an old branch and your API requests revert with it. This is exactly how developers want to work, and it's something neither Postman nor Insomnia does by default.
Bruno doesn't require an account. It doesn't have a cloud sync feature at all. Everything is local. If that sounds limiting, consider what you actually need for most development work: a way to organize and run HTTP requests with environment variables, see responses clearly, and share collections with your team through Git. Bruno does all of that.
The app itself is noticeably faster than Postman. It starts quickly, feels lightweight, and doesn't have the accumulated UI complexity of a product that's been adding enterprise features for years. The interface is clean: a sidebar with your collections, a request editor, a response viewer. It's similar to what Insomnia used to feel like.
Bruno supports REST, GraphQL, and WebSocket. Environment variables work well. You can write scripts to run before/after requests (using JavaScript). It has collection-level and folder-level auth settings, which is useful for testing APIs with different auth schemes.
What Bruno doesn't have: built-in mock servers, API monitoring, a public API directory, or team collaboration features that go beyond "share the Git repo." If you need those enterprise features, Bruno isn't a replacement for Postman at the team level.
But for a solo developer or a small team that uses Git, Bruno handles API testing cleanly without any of the baggage.
Environment variable management across all three
Environment variables are where you spend a lot of time in any API client. Being able to switch between local, staging, and production by changing one dropdown is essential.
All three tools handle environments well. You define variables (like base_url, api_key, token) in environment files, and reference them in your requests as {{variable_name}}. The mechanism is similar across all three.
Bruno's environment files are also stored as local files, which means your staging and production environment variable definitions version-control naturally. You'd obviously not commit actual API keys, but the variable names and structure are in Git, which is useful for onboarding new team members.
Postman and Insomnia store environments in their cloud sync, which works well but means your environment configuration is tied to their platform.
The team collaboration question
This is where Postman justifies its continued existence. If you have a team of 10 developers all working on the same API, Postman's shared workspaces, collection sharing, and access controls are genuinely useful. Everyone sees the same collections, changes sync automatically, and you can set permissions so junior devs can use collections without modifying them.
Bruno's "collaboration" is Git-based. The collection lives in the repo and everyone checks it out. This works perfectly for developers, but it requires everyone to be comfortable with Git and it doesn't give you the real-time sync that Postman provides.
For most small development teams who are already using Git, the Bruno approach is fine. For larger teams or teams where not everyone is a developer (QA teams, product managers who test APIs), Postman's collaboration features are meaningfully better.
What about Hoppscotch, HTTPie, and others?
A few other tools are worth a quick mention. Hoppscotch is a web-based API client (runs in the browser) that's open source and has a clean UI. It's worth bookmarking for quick tests when you don't have your main API client available. HTTPie is a command-line tool that's more readable than curl and excellent for quick scripted tests.
Neither replaces a full GUI API client for serious development work, but both are useful additions to a developer's toolkit.
The actual recommendation
For solo developers and small teams using Git: use Bruno. The Git-native storage model is the right way to handle API collections, it's fast, it doesn't require an account, and it's actively developed. The fact that it's completely free is a bonus.
For teams that need real-time collaboration, mock servers, and API monitoring in one tool: Postman is still the right choice. The free tier handles basic team use, and Pro at $14/month is reasonable for what you get.
For developers working heavily with GraphQL: Insomnia's GraphQL experience is still better than Bruno's. The account requirement is worth accepting if GraphQL is central to your work.
The broader trend is clear. Developers are moving away from tools that store your data in someone else's cloud without a good reason. Bruno represents the direction the ecosystem is going for individual developers. Postman will continue to dominate enterprise teams where collaboration features matter more than local-first storage.
Pick the one that matches how you actually work.