Shiki vs Prism.js: Which Is Right for Your Developer Blog in 2026?

Shiki vs Prism.js: Which Is Right for Your Developer Blog in 2026?

Introduction

Code blocks are the most-read element on any developer blog — and one of the most common performance killers. In 2026 two names dominate the space: Prism.js, the long-time incumbent, and Shiki, rising fast since VitePress, Nuxt Content, and Astro adopted it. This article breaks both down with real benchmark data, not opinions. You will learn when Shiki clearly wins, when Prism still makes sense, and how to implement either in Next.js in minutes.

How They Work: Two Different Philosophies

The biggest difference between them isn’t features — it’s when highlighting happens.

Prism.js: runtime in the browser. The page ships, then Prism’s JavaScript parses code blocks and injects color classes afterward. Consequence: every supported language adds kilobytes to the payload, and visitors wait for highlighting to run (usually imperceptible, unless the page has dozens of code blocks).

<!-- Prism output: plain HTML + classes, colored by JS in the browser -->
<pre><code class="language-ts">const x: number = 1;</code></pre>

Shiki: build-time on the server. At build time Shiki produces complete HTML with inline styles. No syntax-highlighting JavaScript ships to the browser at all — bundle impact for visitors: zero.

<!-- Shiki output: colors already baked in as inline styles -->
<pre class="shiki" style="background-color:#1a1b26">
  <code><span style="color:#7dcfff">const</span> ...</code>
</pre>

One sentence to remember: Prism rents your visitor’s CPU time; Shiki pays upfront at build.

Benchmark: Speed vs Weight

The speed-highlight benchmark (Node v26, Apple M4, median of 9 trials) gives concrete numbers — highlighting operations per minute:

Brutal at first glance: Prism is 7x faster than Shiki at runtime. chsm.dev reached a similar conclusion.

But wait — that’s half the story. The numbers above measure the runtime library in a browser. For a static blog whose highlighting finishes at build time, Shiki’s slow numbers are never paid by your visitors. What visitors pay is the opposite: Prism’s payload growing with every language, versus Shiki’s zero-JS output.

When do runtime numbers actually matter? When you need dynamic client-side highlighting — a live code editor or playground. That’s where Prism (or speed-highlight) genuinely dominates.

One real Shiki cost sits in build time. Users have reported builds slowing from 14s to 46s when loading the full web bundle (discussion #846). The mitigation: fine-grained imports and

Color Quality: TextMate vs Regex

Prism uses its own hand-written regex grammars. Shiki uses TextMate grammars — the same grammar files VS Code uses. The difference shows on edge cases:

// Regex-based highlighters often mis-color these lines:
const regex = /"(?<!\\)"/g; // nested quotes
function pick<T extends object, K extends keyof T>(obj: T, key: K): T[K] {
  return obj[key];
}

On nested generics and regexes containing strings, regex grammars sometimes close tokens too early. TextMate grammars track a context stack, so the result matches what you see in VS Code. For a blog that sells itself on technical quality, readers notice.

Dark Mode & Dual Themes

Prism needs two separate themes plus a manual toggle mechanism. Shiki has dual themes: a single render produces two color sets via CSS variables, and the frontend just swaps a class.

const highlighter = await createHighlighter({
  themes: ['one-dark-pro', 'one-light'],
  langs: ['typescript', 'bash', 'python'],
});

// output stores both themes as CSS variables:
// style="--shiki-dark:#e5c07b;--shiki-light:#b18eb1"

Dark-mode toggling becomes a pure CSS transition — no re-render, no flash on first load.

Practical Decision Criteria

My rule of thumb: content re-rendered on every visit → Prism; content that can be finished at build → Shiki.

Implementing Shiki in Next.js

Minimal steps on Next.js 14+ (App Router):

npm install shiki

import { createHighlighter } from 'shiki';

const highlighter = createHighlighter({
  themes: ['one-dark-pro', 'one-light'],
  langs: ['typescript', 'tsx', 'bash'],
});

export default async function CodeBlock({ code }: { code: string }) {
  const html = (await highlighter).codeToHtml(code, {
    lang: 'typescript',
    themes: { light: 'one-light', dark: 'one-dark-pro' },
  });
  return <div dangerouslySetInnerHTML={{ __html: html }} />;
}

Key points: call

For a visual walkthrough, this video covers Shiki’s workflow well:

Case Study: This Blog

The blog you’re reading (adityo.web.id, Next.js) uses Shiki with the one-light/one-dark-pro themes. Every code block in this article is genuine Shiki output — toggle dark mode in the navbar and watch the colors switch without a reload. I covered other interactive embeds (diagrams, charts) in How to Embed YouTube, Mermaid, and Recharts in a Next.js Blog Without Plugins.

What it delivers in practice: code blocks consistent with VS Code, zero extra JavaScript for highlighting, and dark mode working smoothly across all articles, old and new.

FAQ

What is Shiki?

A syntax highlighter built on TextMate grammars (the same engine VS Code uses) that renders code into inline-styled HTML at build time — not in the browser.

Which is faster, Shiki or Prism.js?

In browser runtime, Prism is far faster (M4 benchmark: ~655K vs ~90K ops/min on small files). But for static blogs, Shiki finishes at build time so visitors never run a highlighter at all.

Does Shiki increase bundle size?

For visitors: no — the final output is plain HTML. For developers: language/theme packages add build-time dependencies, controlled via fine-grained imports.

How do I set up Shiki in Next.js?

Install

When should I still use Prism.js?

When you need dynamic client-side highlighting (live editors, playgrounds), or a legacy project is stable on Prism with its plugins.

Conclusion

The 2026 data clarifies the division: Prism.js wins the runtime for dynamic use cases; Shiki wins the final result for static content. For a modern build-rendered developer blog, Shiki delivers three immediately felt wins — zero JS to visitors, VS Code-faithful colors, and flicker-free dual-theme dark mode — with one manageable trade-off: build time. If your content can be finished at build, choose Shiki. If it must live in the browser, Prism is still legitimate.

References

1. speed-highlight benchmark (ops/min, M4)
2. Shiki vs Prism vs highlight.js 2026 — PkgPulse
3. Comparing web code highlighters — chsm.dev
4. Shiki — Next.js package
5. Discussion #846: build time with the web bundle