Best alternatives to XY in 2026

Plotting a few thousand data points in Python is easy with any charting library; plotting tens of millions and still being able to pan and zoom smoothly is a much harder problem most tools weren't built for. XY, from the team behind the Reflex web framework, tackles this with a Rust core: instead of drawing a marker for every single row above ~200,000 points, it computes a screen-bounded density surface — essentially drawing only the detail your screen can actually show — which keeps rendering at roughly 0.07-0.08 seconds whether you have 10,000 or 100 million points. It's positioned as a drop-in-style replacement for Matplotlib, Plotly, and Bokeh, with a Matplotlib-compatible pyplot adapter to ease migration, full styling via Python, CSS, or Tailwind, and export to HTML, PNG, SVG, or PDF. It integrates natively with the Reflex web framework but works standalone in notebooks and scripts too. It's currently pre-1.0 and in active alpha development, so its API — callback payloads, the Reflex adapter, chart breadth — is still expected to change.