Top 5 Developer API Testing Tools Compared: Postman, Insomnia, or Bruno in 2024
The average developer now spends nearly 30% of their workweek dealing with APIs—testing endpoints, debugging responses, and managing collections. Yet, despite this ubiquity, the choice of API testing tool remains deeply personal, often boiling down to habit rather than objective need. In 2024, the landscape has shifted dramatically. Postman is no longer the default answer; Insomnia has reinvented itself under new ownership, and open-source challengers like Bruno are radically changing how teams store and share API specifications.
If you are selecting a tool for a new project or reevaluating your current stack, the decision is more nuanced than ever. This guide breaks down the five leading options—Postman, Insomnia, Bruno, and two notable contenders—focusing on real-world workflows, collaboration models, and pricing that actually matters.
The Criteria That Matter in 2024
Before diving into the comparison, it’s worth establishing what separates a good API client from a great one. In 2024, the key differentiators are:
- Data residency and storage: Does the tool force your API specs onto a cloud server, or can you keep them in a Git repository?
- AI integration: Are AI features genuinely useful, or are they gimmicks bolted onto a UI?
- Team collaboration: Is sharing via a hosted workspace, or via pull requests in your existing codebase?
- Performance: Does the tool feel sluggish with large collections and complex environments?
These criteria have shifted the conversation away from “which has the most buttons” toward “which fits my team’s governance and security posture.”
Postman: The 800-Pound Gorilla That Keeps Adding Weight
Postman remains the most feature-complete API platform on the market. It is not just a testing tool; it is an entire ecosystem that includes API documentation, mock servers, monitoring, and a robust collection runner. For teams that live inside a single cloud workspace, Postman is incredibly powerful. The ability to share collections, set up environment variables, and run CI/CD integrations natively is second to none.
However, the platform’s bloat has become a genuine concern. The desktop app can feel heavy, often consuming over 500MB of RAM on a standard machine. The move toward a hosted cloud workspace means your data passes through Postman’s servers, which is a dealbreaker for teams with strict compliance requirements (think healthcare, fintech, or defense). The free tier is also increasingly limited; you can only have a certain number of team members and a limited number of API requests per month before hitting paywalls.
Verdict: Choose Postman if you need an all-in-one platform and your team is comfortable with cloud-hosted data. Its AI assistant (Postbot) is useful for generating test scripts, but it is not enough to justify the overhead if you only need simple endpoint testing.
Insomnia: The Designer’s Favorite Reborn
Insomnia was acquired by Kong in 2023, and the 2024 releases have refined its already excellent interface. The tool is built around a clean, distraction-free design that developers who came from tools like Paw or RapidAPI will find familiar. Its standout feature is the native support for GraphQL, which remains superior to Postman’s. If your project relies heavily on GraphQL subscriptions or complex queries, Insomnia is the most comfortable environment to work in.
Under Kong, Insomnia has also pushed hard into the enterprise space with their Insomnia Cloud offering. However, this is where things get tricky. The open-source version is still excellent for solo developers, but the moment you want to sync collections across a team, you are pushed toward their paid cloud plan. Unlike Postman, Insomnia does not have a self-hosted option, which limits its appeal for on-premise teams.
Verdict: Insomnia is the best choice for GraphQL-heavy projects and for developers who prioritize a snappy, non-cluttered UI. It is less ideal if you want a fully open-source, self-managed workflow.
Bruno: The Git-First Disruptor
Bruno is the tool that has generated the most buzz in 2024, and for good reason. It flips the script entirely: your API collections are stored as plain text files in a folder that you commit to Git. No cloud, no database, no account required. You open Bruno, point it at your repository, and your entire team’s API definitions are versioned alongside your code. This is a massive win for teams that want to review API changes in pull requests, just like they review code changes.
The trade-off is that Bruno lacks the advanced features of Postman. There is no built-in mock server, no API monitoring, and the test runner is still relatively basic. But for a developer who wants to write a quick test, run a script, and move on, Bruno is lightning fast. The tool also has a unique “Collection Runner” that executes requests sequentially or in parallel, and it supports environment variables and assertions via JavaScript.
The biggest limitation is that Bruno is not a platform; it is a client. If you need hosted documentation or a shared workspace for non-developers (like QA or product managers), Bruno will not be sufficient. It is explicitly built for developers who live in the terminal and Git.
Verdict: Bruno is the best choice for developer-only teams that value data privacy and version control. It is not a fit for cross-functional teams needing a centralized, no-code API hub.
The Contenders: Apifox and Hoppscotch
Two other tools deserve mention in 2024, as they fill specific niches that the Big Three do not.
Apifox: The All-in-One Chinese Powerhouse
Apifox has been growing rapidly in the Asian market and is now making a push westward. It is essentially a Postman clone that integrates API design, debugging, mocking, and documentation into a single tool. Its strongest feature is the automatic generation of API documentation from your test cases, which saves a significant amount of time. However, its UI is dense, and the English localization is sometimes clunky. It is a solid choice for teams working with Chinese cloud providers or needing a free, self-hosted alternative to Postman.
Hoppscotch: The Lightweight, Open-Source Speedster
Hoppscotch (formerly Postwoman) is an open-source API client that runs directly in your browser. It is incredibly fast and requires zero installation. For quick ad-hoc testing—like checking a public API or debugging a webhook—Hoppscotch is the best option. But it lacks the advanced scripting, environment management, and collection organization of the heavier tools. It is not a daily driver for complex projects, but it is an excellent utility to have in your bookmarks.
Head-to-Head: Making the Decision
To simplify the choice, here is a direct comparison based on what matters most in 2024:
| Feature | Postman | Insomnia | Bruno |
|---|---|---|---|
| Primary Storage | Cloud (mandatory) | Cloud (for sync) | Local Git repo |
| GraphQL Support | Good | Excellent | Basic |
| Scripting/Testing | Advanced (Postman Sandbox) | Moderate (Node.js) | Basic (JavaScript) |
| Team Collaboration | Hosted Workspaces | Hosted Workspaces | Git Pull Requests |
| Free Tier Usability | Limited (request caps) | Good (solo) | Full (unlimited) |
| Data Privacy | Low (data on their servers) | Low (data on their servers) | High (data stays local) |
| Best For | Enterprise & cross-functional teams | GraphQL & UI purists | Git-native dev teams |
The Bottom Line: Which Should You Choose?
There is no single “best” tool in 2024; there is only the best tool for your specific workflow.
- Choose Postman if you need a single source of truth for your entire organization, including non-developers, and you are comfortable with cloud-hosted data. Its feature set is unmatched, and the learning curve is well-documented.
- Choose Insomnia if your project is GraphQL-centric or you simply value a clean, fast interface over a bloated feature list. Be prepared to pay for cloud sync if you work in a team.
- Choose Bruno if you want your API specs to live in Git, you value data privacy, and your team is composed entirely of developers who are comfortable with code review workflows.
A practical approach in 2024 is to use a hybrid setup: Bruno for day-to-day development and local testing, and Postman or Insomnia as a shared documentation hub for stakeholders. This gives you the speed and privacy of a local client without losing the collaboration benefits of a hosted platform.
The era of the one-size-fits-all API tool is over. The best tool is the one that respects your version control, your security constraints, and your team’s actual workflow—not the one with the most logos on its marketing page.