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Launch HN: Simplex (YC S24) – Browser automation platform for developers

The prompt

Hi HN! We’re Marco and Shreya, founders of Simplex ( We’re building all the infrastructure you need for modern browser automation – including remote browsers, steerable web agents, and more. Here’s a demo: We’re excited to be posting on HN again! Back in January, we Show HN’d the earliest version of Simplex ( We’ve now spent close to a year working with real customers, forward-deploying into their codebases, and building web agent systems for them from the ground up to understand what it takes to get agents working in production. We built Simplex because we started seeing a pattern: companies would initially roll their own Playwright/Stagehand web automation solutions. This worked fine in the early prototype stages, but they’d quickly get overwhelmed with technical challenges as they productionized automations across all the websites their customers use. As they scaled, they’d have to build and manage: - Chrome infrastructure: You'll need remote browsers, extension support, browser settings for anti-bot detection/stealth, and a hundred more small fixes. - DOM parsing: We’ve seen many web portals have really weird quirks (nested iframes, shadow DOM elements, dynamic loading, popups, unstable selectors, etc..) that are hard to parse with traditional/existing browser agents. - Agent context engineering: Website state, user prompts, system prompts, past actions all take up a massive amount of context. Without managing this, agents can get caught in loops or take wrong actions. - Caching/reliability: No matter how perfect your prompts are, it’s hard to guarantee consistency without caching/deterministic actions. - Login/2FA: Solve captcha, fetch 2FA from email/text/Google Auth, encrypt/decrypt credentials to access portals blocked by login. - Automation management: You’ll have to store all your prompts, scrapers, and agents, and find a way to make them reusable if you hav

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