Flet Studio
build cross-platform Python apps in the browser
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What is Flet Studio?
Flet Studio is a browser-based IDE and editor for writing, running, saving, and sharing Flet apps. Flet is an open-source, Python-first framework that enables developers to build modern cross-platform applications for web, desktop, and mobile devices from a single Python codebase, without requiring any frontend experience like Dart, Swift, or JavaScript.
Your Python code runs entirely in the browser via Pyodide (CPython compiled to WebAssembly), meaning no Flet account is required to try it and no local install is needed to run something someone else built and shared. The Studio serves as a playground that saves your work across sessions and devices once you sign in, a way to share small apps via a simple link, a gallery of editable Flet examples, and a zero-commitment way to try Flet before installing it locally.
Key features include real-time code execution in the browser, file storage and project persistence, authentication and account support, the ability to fork and edit examples, and the same rendering engine that flet publish and flet build web produce. Studio is designed for trying Flet, prototyping small apps, sharing code snippets, learning, and showing off ideas. The UI is itself a Flet app, built to surface gaps in Flet and feed improvements back into the framework.
Flet Studio is ideal for Python developers who want to build cross-platform apps, beginners learning Flet, developers who need to quickly prototype UI ideas, and anyone who wants to share working Flet apps via a URL without requiring recipients to set up anything. It supports 150+ built-in controls and services with Material and Cupertino design, including layout, navigation, dialogs, and charts.
Flet Studio pricing
Pricing model: Freemium
Flet Studio is completely free to use. No Flet account is required to try it, and there are no paid plans mentioned. Users can write, run, save, and share Flet apps without any cost. Account sign-in is only needed for project persistence across sessions and devices. Flet itself is open-source, and the Studio serves as a browser-based editor with file storage, authentication, and project metadata backend, but all Python code executes client-side in the browser with no server-side execution costs.
Flet Studio pros
- No local Python or Flet install required to start
- No account needed to try Flet initially
- Code runs entirely in browser via Pyodide
- Projects persist across sessions and devices when signed in
- Share working apps via simple URL link
- Browse and fork editable example gallery
- Same rendering engine as published Flet apps
- Real-time UI preview as you code
- 150+ built-in Material and Cupertino widgets
- Single Python codebase for web, desktop, and mobile
- No frontend experience (Dart/Swift/JavaScript) required
- Fast iteration - see UI changes instantly
- Great for prototyping small apps and snippets
- Perfect for bug reports and design sketches
- Zero-commitment way to evaluate Flet before installing
Flet Studio cons
- Only pure-Python packages and Pyodide-built wheels supported
- No real threads - single browser thread limitation
- Browser sandbox blocks local filesystem access
- No shell or local hardware access
- 3×–5× slower than CPython for CPU-bound code
- Slower cold start on first load due to runtime download
- Cannot build desktop or mobile executables
- Not suitable for real multi-file production projects
- Source-only sdists without wheels cannot be installed
Frequently asked questions about Flet Studio
What is Flet Studio?
Flet Studio is a browser-based editor for writing, running, saving, and sharing Flet apps. Your Python code runs entirely in the browser via Pyodide, so no local install is required to run something someone else built and shared with you, and no Flet account is required to try it.
Do I need to install Python or Flet to use Studio?
No. Your Python code runs entirely in the browser via Pyodide (CPython compiled to WebAssembly). There is no local install required to run something someone else built and shared with you, and no account required to try it. You can write a few lines and see them run immediately.
Does my code run on Flet's servers?
No. Your code runs entirely in the browser via Pyodide. While there is a Flet Studio backend for the IDE itself (file storage, authentication, accounts, project metadata), your app's Python code never executes on their servers - it executes client-side, in your browser, in Pyodide.
Can I share my Flet app with others?
Yes. You can share small apps via a link. Send a colleague or someone on the Flet team a URL and they can open, run, and read the code without setting anything up. This is handy for bug reports, design sketches, and showing off specific controls.
Do my projects save between sessions?
Yes. Unlike a transient REPL or paste-and-run sandbox, projects in Studio persist across sessions and across devices once you sign in. This makes it a playground that actually saves your work.
Can I use any Python packages in Studio?
Only pure-Python packages and Pyodide-built wheels are supported. Most of the Python ecosystem works, but packages with C/Rust extensions need a Pyodide build. Source-only sdists (no wheel) cannot be installed. See the Pyodide built-in packages list for details.
Does Studio replace local Flet development?
No. Studio is for trying Flet, prototyping small apps, sharing snippets, learning, and showing off ideas. For desktop and mobile builds, native packages, real multi-file projects, your favorite IDE and debugger, and the full Python ecosystem without Pyodide constraints, you should install Flet locally and use flet run and flet build.
What are the performance limitations of Studio?
Pyodide is roughly 3×–5× slower than CPython for CPU-bound code. There is also a cold start on first load as it fetches the Python runtime and any wheels you import, so initial load is slower than a native install. Subsequent loads are cached.
Can I build mobile or desktop apps from Studio?
No. Studio cannot build desktop executables or mobile packages. For desktop and mobile builds, native packages, and the full Python ecosystem without Pyodide constraints, you need to install Flet locally and use flet run and flet build for iOS, Android, Windows, Linux, macOS, and web.
What is Flet framework itself?
Flet is an open-source, Python-first framework for building modern applications that run on web, desktop, and mobile devices - all from a single Python codebase. It enables developers to build realtime web, mobile, and desktop apps in Python without frontend experience. It uses Flutter to render UI with 150+ built-in controls and services with Material and Cupertino design.