The Postman Problem
For a long time, Postman was the unquestioned king of API clients. It arrived at just the right moment – when REST APIs were taking over the world and developers needed something better than raw curl commands to build, test, and debug them. If you’ve worked in web development for more than a few years, chances are Postman was your first GUI API client. It was free, it was powerful, and it just worked.
But things have changed. In 2023, Postman made the controversial decision to require a cloud account and enforce cloud sync for all collections. For many developers – particularly those working with sensitive APIs, air-gapped environments, or simply those who prefer their tooling to stay local – this was a dealbreaker. Pair that with an increasingly bloated interface, a push towards an enterprise pricing model, and the gradual removal of features from the free tier, and you have a recipe for a mass developer exodus.
The good news? The ecosystem has responded. A wave of excellent alternatives has emerged, each with its own take on what an API client should be. Some are desktop-first, some live in your browser, some call VS Code home, and some are command-line tools that make curl look ancient. This post walks through the best options available today.
A Quick Recap: What Made Postman So Dominant
Before we dive into alternatives, it’s worth understanding what Postman actually offers, because the best replacement for you depends entirely on which of these features you actually use.
Collections are Postman’s core organisational unit. A collection is a group of saved API requests – think of it like a folder structure for your HTTP calls. You can nest them, share them, add documentation to each request, and run them in bulk. For teams, collections became the de facto way to share API knowledge: onboard a new developer, hand them the Postman collection, and they could immediately start hitting your API without having to read a sprawling README.
Environments let you swap variables across different contexts – development, staging, production – without rewriting your requests. A single {{base_url}} variable in your request URL means switching environments is a single dropdown click.
OpenAPI support is another major reason Postman became a standard tool. The OpenAPI Specification (formerly Swagger) is the industry standard for describing RESTful APIs in a machine-readable format – a YAML or JSON document that defines every endpoint, parameter, authentication method, and response shape your API supports. Postman can import an OpenAPI spec and automatically generate a full collection from it, which is a huge time-saver. It can also help you design APIs spec-first and export them as OpenAPI documents.
Newman, Postman’s CLI companion, lets you run collections from the command line, which means you can plug your API tests directly into a CI/CD pipeline. This turned Postman from a manual testing tool into something that could act as a lightweight integration testing framework.
Mock servers, monitoring, and documentation generation round out the feature set, which is why Postman positions itself as an “API platform” rather than just a client. For large teams building complex APIs, that full-stack approach is genuinely valuable.
But for many developers – especially those working solo, on small teams, or with APIs they don’t control – that breadth of features is overkill. And the mandatory cloud account to use basic functionality? That’s where the resentment began.
The Alternatives, One by One
Bruno
Bruno is probably the most talked-about Postman alternative in developer circles right now, and for good reason. Its core philosophy is radical in its simplicity: your API collections are just files on your filesystem. No cloud, no sync, no account. Bruno stores collections in its own plain-text format called Bru, which looks a lot like a structured text file and is entirely human-readable.
This approach makes Bruno an extremely natural fit for Git-based workflows. You create a bruno/ folder in your project repository, commit your .bru files alongside your source code, and your team collaborates on API requests the same way they collaborate on everything else – through pull requests. There’s no “share collection” link, no workspace invite. Just Git.
Bruno supports OpenAPI import, REST, GraphQL, and scripting with JavaScript for pre/post request hooks and test assertions. It runs on macOS, Windows, and Linux, and is open source under the MIT licence.
The caveats: Bruno has no web-based interface, and its cloud sync story is intentionally non-existent. If your team is distributed and not using Git for collaboration, Bruno’s workflow might feel friction-heavy. There’s also been some community grumbling about certain features moving behind a paid tier, which feels at odds with the original open-source ethos – though core functionality remains free.
Best for: Developers who want API collections version-controlled directly in their project repo. If you already love Git and hate SaaS, Bruno will feel like home.
Hoppscotch
Hoppscotch (formerly Postwoman) is the browser-based option in this roundup. It’s a fast, open-source API development tool that runs entirely in your web browser, meaning there’s nothing to install. For quick requests, sharing endpoints with teammates, or working on a locked-down corporate machine where installing software is a headache, Hoppscotch is often the path of least resistance.
Don’t let its browser-based nature fool you into thinking it’s lightweight on features. Hoppscotch supports REST, GraphQL, WebSockets, SSE, and even MQTT – one of the broadest protocol ranges of any client on this list. The interface is clean, dark-mode-first, and noticeably fast.
For teams with data residency concerns, Hoppscotch can be self-hosted via Docker, which means your API traffic never leaves your infrastructure. This makes it a legitimately viable option for security-conscious organisations who’d otherwise be forced into Postman’s cloud ecosystem.
The trade-off is that browser-based storage is inherently more ephemeral than a desktop app. Without an account or self-hosted instance, your collections live in your browser’s local storage, which can be cleared. The self-hosted route solves this but adds operational overhead.
Best for: Developers who want a no-install option, teams with broad protocol needs (GraphQL, WebSocket, MQTT), and organisations that need a self-hosted API client with zero cloud dependency.
Insomnia
Insomnia has had a turbulent couple of years. Originally a beloved independent API client, it was acquired by Kong in 2019. In 2023, a controversial update made cloud login mandatory, wiping local data for many users who refused to sign up – an event the community did not forget. The backlash was significant enough that the team reversed course and restored a proper “local vault” mode, allowing fully offline use without an account.
With that behind it, Insomnia remains one of the most mature and capable API clients available. The interface is clean and polished. Collections are well-organised, environment variables work elegantly, and the plugin ecosystem lets you extend functionality without the app feeling bloated. GraphQL support is first-class, with dedicated query editing, schema exploration, and introspection – if your team works heavily with GraphQL, Insomnia is one of the best tools for the job.
Insomnia also supports REST, gRPC, and WebSockets, and its design-first workflow aligns well with OpenAPI – you can import specs to generate collections and export collections to OpenAPI documents. Scripting support for pre-request scripts and test assertions is solid, making it a reasonable Postman replacement for teams that relied on those features.
The free tier covers local use fully. Cloud sync and team features sit behind a paid plan.
Best for: Developers migrating from Postman who want the most familiar experience. Insomnia hits the right balance between feature depth and usability, and its GraphQL support is hard to beat.
Thunder Client
Thunder Client takes a fundamentally different approach to the problem: instead of being a standalone application, it lives inside VS Code as an extension. For developers who spend most of their working day inside the editor – which, honestly, is most developers – this eliminates the context-switching overhead of opening a separate application entirely.
The interface is deliberately familiar. If you’ve used Postman, Thunder Client will feel immediately intuitive: collections on the left, request builder in the centre, response on the right. You get environment variables, collections, basic test assertions, and scripting. After community feedback, Thunder Client added a “local storage” mode that stores collections as JSON files in your project directory, making them Git-compatible – similar in spirit to Bruno, but without leaving VS Code.
The limitations are mainly around advanced features. Thunder Client doesn’t have the depth of scripting that Postman or Insomnia offer, and there’s no equivalent to Postman’s Newman for CI/CD. For straightforward REST testing during development, though, it’s hard to argue with the convenience of never leaving your editor.
Best for: VS Code-first developers who want to test APIs without switching applications. Excellent for solo developers and small teams where advanced automation isn’t a requirement.
HTTPie
HTTPie started life more than a decade ago as a command-line tool designed to make curl human-friendly. Where curl requires you to remember flags and produces dense, unformatted output, HTTPie uses clean syntax, colours responses with syntax highlighting, and makes JSON feel like a first-class citizen. It became a staple in developer dotfiles almost immediately.
Since then, HTTPie has grown into both a terminal tool and a desktop application. The desktop app brings the same readable, uncluttered philosophy to a GUI, with sessions, authentication, and request chaining handled cleanly. It’s not trying to be Postman – it’s not aiming at teams or CI pipelines or mock servers. It’s a tool for developers who just want to make HTTP requests and see readable responses.
The CLI is free and open source. The desktop app has a free tier with a paid plan for sync features.
Best for: Terminal-first developers, DevOps engineers, and anyone who writes shell scripts involving HTTP calls. HTTPie makes it trivial to document API calls as readable shell commands rather than exported Postman collections.
Yaak
Yaak is the newest entrant on this list and one of the most interesting. It was built by the original creator of Insomnia – who, after selling Insomnia to Kong and watching it grow into something more complex than he intended, decided to start again from scratch with a tighter focus.
The result is an offline-first desktop client built with Tauri and Rust (making it notably lighter than Electron-based alternatives), with zero telemetry, zero cloud accounts, and a strong commitment to staying out of your way. Like Bruno, Yaak mirrors workspaces to your filesystem for Git-based version control. Unlike Bruno, it presents a polished GUI that feels closer to Insomnia’s comfort level.
Yaak supports REST, GraphQL, gRPC, WebSockets, and Server-Sent Events. It can import collections from Postman, Insomnia, OpenAPI, and Swagger. Authentication options include OAuth 2.0, JWT, Basic Auth, and custom plugins written in Node.js or TypeScript. Sensitive values can be stored in your OS keychain, keeping secrets off-disk entirely.
Yaak requires a commercial licence for professional use (with a 30-day free trial), but the model is a simple annual fee with perpetual fallback rights – meaning if you stop paying, you keep using the versions released during your active licence period. No subscriptions, no cloud lock-in.
Best for: Developers who want the polish of Insomnia with the local-first principles of Bruno, and don’t mind paying a straightforward licence fee for a well-maintained tool.
Honourable Mentions
RapidAPI combines an API marketplace with a testing client, making it particularly useful if you work extensively with third-party APIs. It has OpenAPI support and a solid GUI, though it’s more cloud-reliant than most alternatives on this list.
Scalar is worth watching if you’re primarily interested in the API documentation and design side of the equation. It’s open source and integrates well with OpenAPI specs, producing beautiful documentation output.
Hurl is a command-line tool that lets you define and run HTTP requests using a simple plain-text format – think .http files but designed for scripting and CI pipelines. If you’re building automation-heavy workflows, it’s worth a look.
How to Choose
There’s no single right answer here, and that’s actually a good thing. The era of “just use Postman” forced everyone into the same tool regardless of whether it fit their workflow. The alternatives have caught up, and several of them handle specific use cases better than Postman ever did.
If you want API collections living in Git alongside your source code, choose Bruno or Yaak. If you spend your day in VS Code and don’t want another window open, choose Thunder Client. If you need a zero-install option or broad protocol support, choose Hoppscotch. If you’re migrating from Postman and want the smoothest transition, Insomnia is the safest path. If you live in the terminal, HTTPie has been making curl look bad for over a decade.
The best API client is the one your team actually uses consistently. Pick one that fits how you already work, and you’ll spend less time managing your tools and more time building with them.
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