See what's working on your X account: every post compared with your own posts at the same age. Free, and stored only in your browser.PostCurve is a free X analytics extension that shows you what actually works on your account. It analyzes your posting history to uncover your best topics, hooks, formats, timing, breakout posts, underperformers, second waves and engagement patterns — directly inside X. No separate dashboard. No X API setup. Just install it and understand your content better.