Postman vs Insomnia vs Bruno: The Best API Testing Tool for Solo Developers

If you’re a solo developer building a side project, SaaS product, or even just experimenting with a new API, you’ve likely spent more time than you’d like wrestling with your API testing tool. The wrong choice means fighting your tools instead of building your product.

Postman has long been the default answer, but the landscape has shifted. Insomnia offers a sleek alternative, and Bruno has emerged as a serious contender for developers who want version control and local-first workflows.

Let’s break down the real differences—pricing, speed, collaboration, and workflow—so you can pick the right tool for your specific situation.

Why This Comparison Matters Now

The API testing market has changed significantly over the past two years. Postman’s pricing model has become more aggressive, with free tiers that feel increasingly limited for solo developers. Meanwhile, a growing number of developers are moving away from cloud-based tools due to privacy concerns and latency issues.

A 2024 developer survey by Stack Overflow showed that over 60% of professional developers work on APIs at least weekly, and nearly 40% work solo or in small teams. That’s a massive user base making daily tooling decisions with limited head-to-head comparisons.

This article focuses specifically on solo developers—not enterprise teams. If you’re shipping a product alone, your priorities are different: minimal overhead, fast iteration, and no surprise bills.

Postman: The Industry Standard, But Is It Right for You?

Postman is the most widely used API testing tool, with over 20 million registered users. It’s a comprehensive platform that includes API testing, documentation, mocking, and monitoring.

What Postman Gets Right

Postman’s feature set is unmatched. You get:

• A robust collection runner for test suites
• Environment variables and global variables
• Built-in API documentation generation
• Mock servers for front-end development
• Team collaboration features (workspaces, sharing)
• A vast ecosystem of integrations

For solo developers who might eventually need to collaborate, Postman’s learning curve is well-documented. There are countless tutorials, and most developers have some familiarity with it.

The Downsides for Solo Developers

Postman’s biggest issue for solo developers is the pricing structure and performance.

The free tier used to be generous. Now, it limits you to 1,000 API calls per month on cloud features, and some advanced features like API monitoring are restricted to paid plans. The paid tiers start at $14 per month for individuals, which isn’t outrageous but adds up when you’re bootstrapping.

Performance is another concern. Postman has become noticeably heavier over time—it’s an Electron-based app that can consume 500MB to 1GB of RAM. On a modest laptop, that’s noticeable. Launch time can be several seconds, which interrupts flow when you’re iterating quickly.

The verdict for solo devs: Postman is the safe choice if you need a comprehensive tool and don’t mind the overhead. But if you’re working alone and want speed, there are better options.

Insomnia: The Developer-First Alternative

Insomnia, originally built by Kong, positions itself as a more developer-centric tool. It’s lighter than Postman and has a cleaner interface.

What Insomnia Does Well

• GraphQL support: Insomnia has native GraphQL support, which is a huge plus if you’re building with modern APIs
• Speed: It’s noticeably faster than Postman, with a more responsive UI
• Clean design: The interface is minimal and uncluttered
• Environment management: Environments and variables are straightforward to set up
• Plugin system: Insomnia has a plugin API that lets you extend functionality

Insomnia’s Limitations

The main issue with Insomnia is its collaboration model. While you can sync data to Insomnia Cloud, the free tier is limited. For solo developers, this isn’t a dealbreaker—you don’t need team collaboration—but it becomes a problem if you want to share collections with others later.

Insomnia also has fewer built-in features than Postman. You won’t find mock servers or API documentation generation as polished as Postman’s. The testing framework is functional but less comprehensive.

Another concern is Insomnia’s direction since Kong acquired it. The company has been pushing toward its paid “Insomnia Plus” tier, which starts at $5 per month. While that’s cheaper than Postman, it signals a shift toward monetization.

The verdict for solo devs: Insomnia is a strong choice if you value a clean, fast interface and work primarily with REST or GraphQL APIs. But it’s not radically different from Postman in its approach—it’s still a cloud-synced, GUI-based tool.

Bruno: The Local-First, Git-Friendly Contender

Bruno takes a fundamentally different approach. Instead of storing your API collections in a cloud database, Bruno stores everything as plain text files in a folder on your local machine. These files use a simple markup language called Bru.

How Bruno Changes the Workflow

This local-first approach has significant implications for solo developers:

• Version control: Your API collections live in Git. You can track changes, revert to previous versions, and branch your API tests just like your code. This is a game-changer if you treat your API tests as part of your codebase.
• Privacy: No data leaves your machine. Your API endpoints, headers, and test data stay local.
• Offline work: You can work without an internet connection. No sync delays, no cloud dependency.
• Transparency: The Bru file format is human-readable. You can see exactly what each request contains by opening a file in any text editor.

What Bruno Lacks

Bruno is newer and less feature-rich than Postman or Insomnia. Some limitations include:

• No built-in collaboration: You can’t share collections with team members in real-time. You’d have to use Git for that, which requires some technical knowledge.
• Fewer integrations: No native integrations with tools like Jenkins, Slack, or monitoring services.
• Smaller ecosystem: Fewer community plugins and templates.
• No GraphQL support: As of early 2025, Bruno’s GraphQL support is still in development.

Pricing and Open Source

Bruno is open source and free. There’s no paid tier for the core tool. The project is funded through GitHub sponsorships and a “Pro” version that includes some cloud features, but the core functionality is free forever.

The verdict for solo devs: Bruno is the best choice if you value version control, privacy, and a lightweight tool. It’s especially well-suited for developers who already use Git for everything and want their API tests to follow the same workflow.

Head-to-Head Comparison

Here’s a quick table for reference:

Feature	Postman	Insomnia	Bruno
Pricing	Free tier limited, paid from $14/mo	Free tier, paid from $5/mo	Open source, free
Storage	Cloud-based	Cloud-based	Local files (Git)
Version control	Limited (paid)	Limited (paid)	Native via Git
GraphQL support	Yes	Yes	No (in development)
Performance	Heavy (Electron)	Medium (Electron)	Light (Electron)
Collaboration	Strong	Moderate	Via Git only
Learning curve	Moderate	Low	Low
Offline support	Limited	Limited	Full

Which Should You Choose?

Your choice depends on your specific workflow and priorities.

Choose Postman if:

• You need comprehensive features like mock servers and API documentation
• You might collaborate with others in the future and want a familiar tool
• You don’t mind the performance overhead

Choose Insomnia if:

• You work heavily with GraphQL
• You want a lighter tool than Postman but still want cloud sync
• You prefer a clean, modern interface

Choose Bruno if:

• You’re a Git-first developer who wants version control for API tests
• You value privacy and data ownership
• You want a free, open-source tool without pricing strings attached
• You’re comfortable with a more technical workflow

A Practical Suggestion

If you’re a solo developer starting a new project, I’d recommend trying Bruno first. The Git-based workflow is a natural fit for how most developers already work, and the tool is free and fast.

If you find Bruno too limited—say you need GraphQL support or team collaboration—then move to Insomnia or Postman. The learning curve for all three tools is manageable, and you can export collections between them if needed.

The Bottom Line

The best API testing tool for solo developers in 2025 isn’t about which has the most features—it’s about which fits your workflow without adding friction. Postman remains a solid all-rounder, but its weight and pricing are increasingly at odds with a solo developer’s needs. Insomnia is a good middle ground. Bruno offers a genuinely different approach that aligns with modern development practices.

Try all three. Spend an hour with each. See which one feels natural. Your future self—and your API tests—will thank you.