{"slug":"emotion","name":"Emotion","domain":null,"best_rank":6,"categories":1,"entries":[{"slug":"best-css-in-js-libraries-for-server-rendered-react-apps","title":"Best CSS-in-JS libraries for server-rendered React apps","rank":6,"of":7,"score":2,"appearances":2,"modelRanks":{"ChatGPT":5,"Claude":5},"reason":"Flexible object, css-prop, and styled APIs; proven critical-CSS extraction and streaming SSR; particularly valuable when an existing application or Material UI stack already depends on it.","reasons":[{"model":"ChatGPT","reason":"Flexible object, css-prop, and styled APIs; proven critical-CSS extraction and streaming SSR; particularly valuable when an existing application or Material UI stack already depends on it."},{"model":"Claude","reason":"Still the best runtime CSS-in-JS for teams genuinely needing runtime dynamism on server-rendered apps that aren't RSC-based (Next.js Pages Router, classic Express/Vite SSR) — battle-tested SSR extraction and streaming support, huge install base, and it remains the styling engine under MUI, so millions of server-rendered apps run it in production today. Ranked this low only because the category's center of gravity moved to RSC, where Emotion's runtime model fundamentally doesn't fit."}],"fixes":[{"model":"ChatGPT","fix":"SSR requires careful cache and extraction setup, while its runtime overhead and weaker Server Component fit make it less attractive for new performance-focused apps."},{"model":"Claude","fix":"Incompatible with React Server Components (client components only), adds runtime bundle and render cost, and its maintainers have themselves signaled the runtime approach is a dead end for the RSC era — wrong choice for new App Router projects."}],"updated":"2026-07-16","api":"https://modelsagree.com/api/v1/best/best-css-in-js-libraries-for-server-rendered-react-apps.json"}],"page":"https://modelsagree.com/product/emotion","check":"https://modelsagree.com/check?q=Emotion","updated":"2026-07-16T21:15:59.371Z","attribution":"modelsagree.com, CC BY 4.0"}