I built a local browser automation engine for X growth instead of using APIs

Hey PH community,

I'm Silas, an indie hacker building tools at Launch System Lab.

Over the past few months I was spending way too much time manually searching posts, scanning replies, and following interesting accounts on X. It started to feel like a full-time job.

Most automation tools I found were either expensive subscriptions or relied on cloud bots and APIs. So I built something different: X Growth Engine, a browser extension that runs entirely locally inside Chrome and Edge.

Instead of using external servers, the extension interacts directly with the page using DOM automation and native requests. It also simulates human behavior with randomized delays, interaction timing patterns, etc., to keep things looking natural.

One design decision I made for the PRO version is the activation system: it allows two active slots, but a slot is tied to a specific browser installation rather than a machine or user profile. This makes it possible to manage multiple X accounts using different browser profiles while still using a single activation slot.

I'm planning to launch it on Product Hunt this coming Tuesday (March 17) with both Free and PRO versions.

If anyone here is experimenting with growing on X, I’d love to hear how you’re approaching it - manually, with APIs, or with browser automation.

Happy to share early access with anyone curious to try it.