React 19

JavaScript library for building user interfaces with components

MIXEDAI Build

Pricing

Free

Learning curve

Moderate

Time to value

Weeks

BEST FORSoloSmall TeamGrowing Business

WORKS FOR

Building the frontend for web applications, building the UI for desktop apps within a native framework, building UI libraries with the React Compiler

KEY INSIGHT

A foundational JavaScript library for building component-based user interfaces, often used with modern tooling.

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What people reported, in their own words. Every line links to where it was said.

“was a pain in the ass trying to upgrade to nextjs 15 / react 19”
NEGATIVE · ease of use · Hacker News · 2026-07-07
“Because of the recent React 19 CVE-2025-55182, I shipped an emergency one-liner”
NEGATIVE · reliability · Hacker News · 2025-12-04
“React 19 + React Compiler: Automatic memoization, no more useMemo/useCallback hell”
POSITIVE · performance · Hacker News · 2025-11-23
“React 19 required almost no code changes in my multiple production apps so unless I missed something, I would say the API surface was virtually unchanged by it”
POSITIVE · ease of use · Hacker News · 2025-10-28
“I am advocating for a React 19 update because at least React 19 can tell the test framework when it is done running callbacks, it might have me writing tests for components again”
MIXED · features · Hacker News · 2025-06-06
“I still need to use —-legacy-peer-deps due to using React 19”
NEGATIVE · reliability · Hacker News · 2025-05-06