Reflex Open Sources XY: A Rust-Backed Super-Fast Python Charting Library That Keeps 100 Million Point Charts Interactive

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Reflex AI has released XY, an Apache-2.0 Python charting library for interactive 2D visualization. Most Python charting stacks create one drawable object per row, so past a few hundred thousand points, render, hover, and zoom degrade. XY moves the work into a native Rust core, sends the browser typed binary buffers instead of JSON, and draws with WebGL2. In the terms of the benchmark, XY holds 0.071 s at 10,000 points and 0.081 s at 100 million. It ships as pip install xy and requires Python 3.11 or newer.

Is it deployable

XY is early alpha at version 0.0.1. It ships as pip install xy and requires Python 3.11 or newer.

That maps to a clear deployment envelope. Startups and mid-size data teams can adopt it now for internal analytics, notebooks, and shareable artifacts. Regulated enterprises should pilot it rather than put it on a customer-facing critical path. Fit is strongest where row counts are the actual bottleneck: quantitative finance (tick data), genomics and bioinformatics (Manhattan plots, allele-frequency scans), observability and telemetry, astronomy, and geospatial analytics. Here is how to install it in 1 line.

Copy CodeCopiedUse a different Browserpip install xy

Explainer

How the representation ladder works

XY keeps canonical f64 columns in a ColumnStore in Python and picks a rendered representation per trace. Current defaults start M4 decimation above 10,000 rows for long ordered lines, and automatic scatter density above 200,000 points. Density grids default to 512×384 cells. The docs are explicit that these are pre-1.0 policy thresholds, not API …

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