Preswald is an AI agent that helps you build dashboards, internal tools, and data apps. It gives you a fast, reactive runtime, built-in UI components (tables, charts, inputs), and one-click deployment to share your app in the cloud or browser.
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Preswald
👋 Hey everyone — this is Amrutha and Shivam, co-founders of Structured Labs (YC S23) and the makers of Preswald (https://preswald.com), launching today.
Preswald is a programmable environment where you can build and deploy interactive Python data apps entirely in the browser. It’s like Replit meets Streamlit, but reactive, stateful, and tailored for data workflows, like investment reports, financial analyses, and product metric breakdowns.
You get:
- A real project+file system
- A Pyodide-based runtime (runs in-browser: this is the coolest part; you don't need a backend to run Python analysis code!)
- A code editor + live preview
- An AI agent that writes and refactors code in-place, just like Cursor, but optimized for data reports
- One-click deploys (Structured Cloud, GCP, or static export: you can just click a button and share with friends and teammates without having to worry about hosting services or cloud systems)
Why we built it:
We saw founders, PMs, and analysts doing their best thinking in Jupyter notebooks or ad-hoc scripts but getting those insights into usable tools meant jumping through too many hoops (frontend code, hosting, auth, etc.). We wanted to stay in Python, and still ship real apps. Creating interactive reports with user-facing drilldowns, filters, and more, can now be done by anyone with a tiny bit of coding experience, without complex deployments or hosting, just like we can all now do for general apps with tools like Bolt and Lovable!
Preswald is built around a reactive runtime: every component or computation is a tracked atom. Change a slider, update a threshold, rerun just the affected logic. The same Python file can run client-side or on a FastAPI server with zero changes to your code.
👀 Try it out:
- preswald.com
- github.com/structuredlabs/preswald
- Amrutha, Shivam, and the Structured Labs team
@amrutha____ Congrats on the launch! Looks great!
Preswald
@will_megson Thanks Will!
Andi
@amrutha____ Congrats on the launch and great work!
@amrutha____ amazing product! good to know that you are YC backed.
Heartiest Congratulations
@amrutha____ It's disappointing to see job postings where candidates are asked to star your repositories and perform QA tasks as part of a so-called "coding assignment." This practice comes off as exploitative. If you need QA, consider hiring professionals rather than disguising unpaid work as part of the recruitment process.
Holy crap this looks awesome. What kind of projects have you seen ?
I use supabase right now, is it a good fit for me to use this for creating an internal tool? Eg: Updating users accounts on the fly for my b2b saas
@maddie_wang Yes! People have been using Preswald for everything from internal admin dashboards to customer support tools, lightweight CMS setups, and custom B2B ops panels. If you’re building anything that needs flexible, fast UIs on top of your data, it’s a great fit.
Preswald
@maddie_wang You can certainly use it for internal tools. The most common use-cases are often dashboards (like KPI dashboards, log analytics dashboards). For supabase, you can set up a DB connection or pull in a CSV
Preswald is awesome! We use it for our interactive, data-driven blog posts, and I wish I could've used it when I was a dashboarding fiend at my previous jobs!
Preswald
@akshay_chalana Thank you so much! Interactive blog posts are an interesting application of data apps