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James

@atomiksdev

@Base_UI dev

 Australia
github.com/atomiks
Joined June 2012
  • Tweets473
  • Following293
  • Followers1.6K
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Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)Photo by James (@atomiksdev)
This summarizes my experience with GPT-5.5 (left) vs. Fable (right) Even if GPT-5.5 can pass tests, its solution is almost always excessively verbose and it doesn't find the minimal one
GPT-5.5, 25 line diff

ALT GPT-5.5, 25 line diff

Fable, 3 line diff

ALT Fable, 3 line diff

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One thing you get for free moving to Base UI from Radix is speed. I benchmarked the areas that most affect perf (opening a dialog on a big page, mounting lots of selects, opening big menus, sweeping over menu items etc.) In each of the six scenarios, Base UI was the fastest.
Bar chart titled “Popup performance comparisons” showing lower-is-better timings for Base UI 1.6.0, Radix UI 1.4.3, and React Aria Components 1.19.0. Base UI is fastest for dialog open at 112 ms, select open at 275 ms, menu open at 285 ms, tooltip trigger mount at 24 ms, select trigger mount at 147 ms, and menu item highlight at 2 ms. Radix UI measures 280 ms, 484 ms, 421 ms, 25 ms, 473 ms, and 23 ms respectively. React Aria measures 268 ms, 960 ms, 814 ms, 40 ms, 410 ms, and 58 ms respectively.

ALT Bar chart titled “Popup performance comparisons” showing lower-is-better timings for Base UI 1.6.0, Radix UI 1.4.3, and React Aria Components 1.19.0. Base UI is fastest for dialog open at 112 ms, select open at 275 ms, menu open at 285 ms, tooltip trigger mount at 24 ms, select trigger mount at 147 ms, and menu item highlight at 2 ms. Radix UI measures 280 ms, 484 ms, 421 ms, 25 ms, 473 ms, and 23 ms respectively. React Aria measures 268 ms, 960 ms, 814 ms, 40 ms, 410 ms, and 58 ms respectively.

shadcn (@shadcn) profile pictureshadcn
@shadcnJul 3
Starting today, we are making @base_ui the default component library in shadcn/ui. First, a bit of history. When shadcn/ui launched in 2023, it was built on Radix. At the time, nothing else came close. Headless. Accessible. Composable. Fast forward a few years and the team who built Radix are building something new: Base UI.
Image from shadcn (@shadcn)
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James retweeted
shadcn (@shadcn) profile picture
shadcn
@shadcnJul 3
Starting today, we are making @base_ui the default component library in shadcn/ui. First, a bit of history. When shadcn/ui launched in 2023, it was built on Radix. At the time, nothing else came close. Headless. Accessible. Composable. Fast forward a few years and the team who built Radix are building something new: Base UI.
Image from shadcn (@shadcn)
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Fable was great at code reviews I compared 4 models on the quality of their reviews of a complex React component (same prompt for each). Was nice while it lasted... Even still, they each found something the others didn’t
Weighted score chart alt text: Horizontal stacked bar chart comparing weighted review scores. Consortium scores 129, Claude Fable 5 XHigh 82, GPT 5.5 Pro Extended 46, GPT 5.5 XHigh 45, and Claude Opus 4.8 XHigh 40. Scores are split by issue type.

ALT Weighted score chart alt text: Horizontal stacked bar chart comparing weighted review scores. Consortium scores 129, Claude Fable 5 XHigh 82, GPT 5.5 Pro Extended 46, GPT 5.5 XHigh 45, and Claude Opus 4.8 XHigh 40. Scores are split by issue type.

Unique issue chart alt text: Horizontal bar chart comparing unique issues found. Claude Fable 5 XHigh found 21, Claude Opus 4.8 XHigh found 7, GPT 5.5 Pro Extended found 7, and GPT 5.5 XHigh found 4.

ALT Unique issue chart alt text: Horizontal bar chart comparing unique issues found. Claude Fable 5 XHigh found 21, Claude Opus 4.8 XHigh found 7, GPT 5.5 Pro Extended found 7, and GPT 5.5 XHigh found 4.

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i hate it when tooltips jump around when you hover over them and switch between items, really like the fact that making this kind of smooth tooltip is very trivial with @base_ui
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Base UI Drawer is live. Here are some of my favourite features 🧵👇
Base UI (@base_ui) profile pictureBase UI@base_uiFeb 12
Introducing: Drawer v1.2.0 ✔︎ New Drawer component ✔︎ New useFilteredItems hook ✔︎ Support lazy element in `render` ✔︎ Tons of Combobox + Autocomplete improvements ✔︎ Support `keepMounted` on NavigationMenu ✔︎ Support `finalFocus` on Select base-ui.com/react/overview/r…
Releases · Base UI

Releases · Base UI

Changelogs for each Base UI release.

base-ui.com
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Base UI crossed 1.1M+ weekly downloads. We grew ~19% weekly for the past 7 weeks. Not that for one year in 📈
Image from Colm Tuite (@colmtuite)
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Built with @base_ui
nanda (@nandafyi) profile picturenanda
@nandafyi18 Dec 2025
6 months ago to now
Image from nanda (@nandafyi)
Image from nanda (@nandafyi)
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I'm constantly impressed by @base_ui's flexibility. You can use NumberField's scrub area to make the input scrubbable, and even place other interactive elements like menu triggers on top:
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shadcn 🤝 Base UI A first class integration. Same shadcn abstraction, rebuilt for Base UI components.
shadcn (@shadcn) profile pictureshadcn
@shadcn12 Dec 2025
Replying to @shadcn
Start with a component library: Radix or Base UI. We rebuilt every component for Base UI, keeping the same abstraction. They are fully compatible with your existing components, even those pulled from remote registries. When you add components, we auto-detect your library and apply the right transformations.
Image from shadcn (@shadcn)
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Introducing Base UI v1 ✔︎ 35 unstyled UI components ✔︎ New npm package (base-ui/react) ✔︎ New website ✨ ✔︎ Configurable, composable, customizable ✔︎ Accessible, based on ARIA + WCAG base-ui.com
Unstyled UI components for accessible design systems · Base UI

Unstyled UI components for accessible design systems · Base UI

Unstyled UI components for building accessible web apps and design systems.

base-ui.com
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Opening up coss ui 🎉 The new UI we're building for the @calcom platform. Built on top of @base_ui, as we strongly believe in the project and the team behind it. It's now open to everyone who wants to test it, break it, and make it better 💪
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More from 🤫 project
Image from Colm Tuite (@colmtuite)
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The @base_ui Combobox is looking to ship as multiple different components: 1. Combobox 2. Autocomplete 3. FilterableMenu Some of the components you can build with these:
Multiple select combobox

ALT Multiple select combobox

Input inside popup combobox

ALT Input inside popup combobox

@ mentions textarea combobox

ALT @ mentions textarea combobox

Emoji picker grid combobox

ALT Emoji picker grid combobox

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Short explainer: 1. Combobox = input + select options (filterable select) 2. Autocomplete = input + suggestions (e.g. search widget) 3. FilterableMenu = input + menu items (e.g. cmd+k, emoji picker)
Combobox aka FilterableSelect

ALT Combobox aka FilterableSelect

Autocomplete

ALT Autocomplete

FilterableMenu

ALT FilterableMenu

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The names are not necessarily finalized (or all shipping in the next release together), but hopefully!
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Thanks @base_ui team for the llms.txt feature. It's crazy how simple and fast you can migrate all codebase to replace all outdated code with just Claude Code and 1 simple prompt: > Update all React components that use Radix UI to use Base UI instead (base-ui.com/llms.txt)
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Tailwind users: do you still use Tailwind v3, or have you upgraded to v4?
24%Tailwind v3
59%Tailwind v4
17%Results
58 votes • Final results
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Seems v3 still has 2x the downloads of v4: tools-public.mui.com/prod/pa…
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TIL that Next.js DevTools is using @base_ui (btw beta.2 just went out)
Image from Seb ⚛️ ThisWeekInReact.com (@sebastienlorber)
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