microcharts vs MUI X Sparkline — bundle size and RSC comparison

MUI X Charts ships SparkLineChart, an inline-sized chart from the same family as its full Line, Bar, and Pie charts, themed by and integrated with Material UI. This comparison turns on one question: whether your app already ships MUI. Answer it first, because it changes which library is the cheap one. The question bites hardest where the mark must be cheap, static, or independent of MUI: a table column of trends, a KPI row in an RSC, a chart in a streamed AI reply.

The numbers

MUI X sizes via esbuild tree-shake of @mui/x-charts/SparkLineChart, minify+gzip 2026-07-23; directive + default markup verified against the published package. microcharts from .size-limit.json (CI).

The two MUI scenarios are deliberate. Inside a MUI app the Material core is already in your bundle, so the sparkline's marginal cost is the smaller figure. Without MUI, @mui/material and @mui/system are required peer dependencies: you install and ship them to render one sparkline. MUI X Charts (community) is MIT and actively maintained, and these sizes are dated pins from the published package.

If your app is already on MUI

SparkLineChart is the coherent choice, and this page may talk you out of nothing. You get one vendor for the sparkline and the full charts beside it, the same theme object driving both, and the MUI X tooltip, highlighting, and animation stack you already use elsewhere. The shared charting core (data providers, interaction plugins, vendored d3) is what makes that family consistent, and it is why one sparkline carries tens of kilobytes.

Two defaults are worth checking even there:

• SparkLineChart is marked 'use client'. The server can emit initial HTML, but the component always hydrates and ships its JavaScript.
• As published, the SparkLineChart SVG renders with aria-hidden="true" and no accessible name, so the chart is invisible to assistive technology until you label it yourself.

If it is not on MUI

The mark then has to justify pulling in MUI, and microcharts is the cheaper answer on four counts:

• Bundle. microcharts charges per chart subpath: 4.25 kB static · 6.94 kB interactive for Sparkline against a catalog band of ~2–7 kB interactive · ~1–4 kB static gzip, with zero runtime dependencies and no required peers beyond React.
• Server Components. The default export is hook-free static SVG with zero client JS; interactivity is a separate /interactive import.
• Accessibility. Every microchart defaults to role="img" with a natural-language summary generated from the data, so labeling is not a task per chart.
• Coverage. 106 word-sized chart types under one grammar, when you need more shapes than a sparkline.

Theming crosses both cases. MUI X charts theme through the MUI theme object, which is coherent if you live there. microcharts themes through --mc-* CSS custom properties at near-zero specificity, so it follows any design system, including a MUI one.

Next

• When to use microcharts
• microcharts vs Recharts
• React sparklines
• Theming — fitting charts into an existing design system