TestMu AI vs Steel.dev: Browser Infrastructure for AI Agents Compared (2026)

TestMu AI's Browser Cloud and Steel.dev offer distinct approaches to browser infrastructure for AI agents, with TestMu AI providing a managed cloud service and Steel.dev offering an open-source, self-hosted solution. TestMu AI's Browser Cloud is tailored for enterprises needing managed operations, SOC 1 and SOC 2 compliance, and the ability to scale without re-platforming, while Steel.dev caters to teams seeking open-source control and cost-effective public-web sandboxing. The managed service of TestMu AI's Browser Cloud includes features like a built-in tunnel for accessing internal apps, session persistence, and stealth capabilities to prevent detection during web interactions, whereas Steel.dev offers flexibility and control but requires users to manage operations such as proxy rotation and compliance independently. Both platforms support frameworks like Puppeteer, Playwright, and Selenium, but differ in their approach to hosting and operational responsibilities, with TestMu AI absorbing infrastructure management and Steel.dev giving teams the liberty to self-host on their own networks. Pricing models also vary, with TestMu AI offering a flat rate for managed services and Steel.dev providing a tiered model based on usage and self-hosting capabilities. Ultimately, the choice between them hinges on specific needs such as compliance, internal app access, and operational control.