Blog
Thoughts on API testing, local-first development, and building better developer tools.
Why we built Rostyman
Most API clients today assume you want your data in the cloud. Every new protocol behind a paywall. Every account prompt. Every "your data is synced to our servers" disclaimer. We started asking: why is the tool that's supposed to help us test our APIs so dependent on the cloud? So we built something different.
Test your API, your UI, and your database in one tool
When you're debugging a bug, you usually need three windows open: your API client, your browser, and a database GUI. You send the request, watch the response, check if the database updated correctly, then reload your UI to see if the UI reflects the change. It's a workflow loop that every developer knows. Rostyman is the first tool designed to close that loop — API testing, browser automation, and a database client, all in one window.
How we think about building an API client
Mature API clients have years of polish, large ecosystems, and good team features. We're newer, rougher, and ambitious in a way that might feel overreaching. Here is where we think existing tools win, where we think we bring something new, and where we still have ground to cover — an honest self-assessment.
Local-first API testing — why your data should never leave your machine
Your API test collection is a map of your entire system. It contains endpoint URLs, authentication tokens, environment variables, and sometimes example payloads with real data. When you store that in the cloud — even with a reputable provider — you're trusting that provider with a detailed blueprint of your infrastructure. Local-first is not just a technical choice. It's a security posture.
Ready to try Rostyman?
Free download — no account, no cloud, no credit card.
Download Free