App interfaces
Tailwind with Radix UI and Lucide icons in a React 19 app.
Frontend
Tailwind CSS development services from an app and its marketing site
Our Sales OS product styles its React app and its Next.js marketing site with Tailwind CSS. It runs Tailwind 3 today, and we move projects to Tailwind 4.
1Published build on Tailwind CSS
3Tailwind version in that build
22 Jan 2025Tailwind CSS 4.0 released
8 May 2026Tailwind CSS 4.3 released
What we build
What we build with Tailwind CSS
Charts and dashboards
Tailwind beside Recharts for the account views.
Marketing sites
A Next.js 15 site styled with Tailwind and Motion.
Tailwind 3 to 4
Projects moved to the all-new version.
Architecture
Where Tailwind CSS sits in a build
Tailwind across an app and its site
Marketing site
Next.js 15Tailwind and Motion
App UI
React 19 and Vite 8TypeScript
Tailwind CSS 3With Radix UI and Lucide
Back end
FastAPIPython 3.13, Pydantic 2
From Sales OS, an in-house product with an AI account research engine.
Versions
From Tailwind 3 to Tailwind 4
The version our build still runs on
In Sales OS today
Tailwind CSS 3
- Used on the app UI and the marketing site
- Version named in the case study
Since 22 Jan 2025
Tailwind CSS 4
- An all-new version with a reimagined configuration
- Version 4.3 released on 8 May 2026
Source: Tailwind CSS blog, checked 3 November 2026.
Builds
The Tailwind CSS build we can show you
AI product, in-house
Sales OS
A React 19 and Vite 8 app plus a Next.js 15 marketing site, styled with Tailwind CSS 3, behind a FastAPI back end.
1 creditOpens all six tabs of an account brief
Fit check
When Tailwind CSS is the right call
Pick Tailwind CSS when
- You want styling kept beside the markup
- A team shares one design system across an app and a site
- You build in React or Next.js
Look elsewhere when
- You need many published Tailwind builds to compare, which we do not have
- A tiny page with a few rules of plain CSS
- Your design system already runs on another approach
Explore
Same job, other tools
Where we used it
Stack
What Tailwind CSS usually ships with
React
TypeScriptVite
Node.js
Angular
Vue.jsFAQs
What buyers ask first
Which Tailwind CSS version should a new project use?
Tailwind CSS 4, released on 22 January 2025, with version 4.3 out on 8 May 2026. Our published build still runs Tailwind 3.
Do you build the marketing site too?
Yes. The Sales OS marketing site is a Next.js 15 site styled with Tailwind CSS and Motion.
Tailwind with React or with Angular?
Our published Tailwind work is on React and Next.js. We have shipped Angular four times without it.
Who owns the code and the cloud accounts?
You do, from the first commit. Repositories and cloud accounts stay in your name.
Tell us what your interface looks like today
Thirty minutes on your design system, your Tailwind version and your front end. No sales pitch.