Flems
The facts below are what the maker publishes about Flems, checked and dated. Our editors have not written about it yet.
The facts
Each one read from Flems's own pages, with the date it was checked.
Where it runs
- Browser execution
- After the page loads, code is computed in the browser and saved as a compressed string in the URL.checked 12 Oct 2026
What it does
- Compilers
- The site README says Flems supports TypeScript, LiveScript, and Babel standalone compilation.checked 12 Oct 2026
- Default files
- A new Flems starts with HTML, JavaScript, and CSS files, and users can add more files.checked 12 Oct 2026
- Dependencies
- Users can add CSS and JavaScript dependencies by URL or NPM package reference, which are fetched from unpkg.com.checked 12 Oct 2026
- Deployment options
- staticchecked 24 Sep 2026
- Editor and runtime
- The module README lists an editor, runtime console, automatic reload, and controls for toolbar and file tabs.checked 12 Oct 2026
- Editor options
- The Flems module exposes options to show or hide the toolbar, file tabs, link tabs, share and reload buttons, and console.checked 12 Oct 2026
- Embed and self-host
- Flems.io is based on an open-source Flems module that can be used for self-hosting or embedding.checked 12 Oct 2026
- Files and languages
- A new Flems starts with HTML, JavaScript, and CSS files, and it supports TypeScript, LiveScript, and Babel standalone compilation.checked 12 Oct 2026
- Fullscreen limit
- The Flems.io README says fullscreen functionality is currently disabled.checked 12 Oct 2026
- Full-stack runtime
- Nochecked 24 Sep 2026
- Integration limit
- For linked files, the module README says CORS-enabled files shorter than 200,000 characters open in the editor; other linked files are simply linked.checked 12 Oct 2026
- License
- The Flems repository identifies its license as WTFPL.checked 12 Oct 2026
- Limit
- The project README describes Flems as a static web app and browser code playground.checked 12 Oct 2026
- Product
- Flems describes itself as a browser coding playground.checked 12 Oct 2026
- Purpose
- Flems is a browser playground for prototyping and sharing front-end examples.checked 12 Oct 2026
- Runtime
- The module uses an iframe as a runtime for the code being edited.checked 12 Oct 2026
- Self-hosting and embedding
- Flems.io is based on an open-source Flems module that can be self-hosted or embedded.checked 12 Oct 2026
- Shareable links
- Flems stores application state in the URL hash, so the URL can link to the current playground state.checked 12 Oct 2026
- Sharing
- Flems stores playground state as a compressed string in the URL, which serves as a shareable link to the current example.checked 12 Oct 2026
- Sharing controls
- link_accesschecked 24 Sep 2026
- Support
- The module README directs users who need bundling help to create an issue.checked 12 Oct 2026
- Use case
- Flems.io is described as a web playground for prototyping ideas and sharing working front-end code examples.checked 12 Oct 2026
Alternatives to Flems
- 1
Replit
Free planAndroidiOSWebLinux9.2From $18 a month - 2
StackBlitz
Free planAndroidiOSWebAPI8.9Free plan - 3
Playcode
Free planAndroidiOSWebAPI8.9From $25 a month - 4
Paperspace Gradient
Free planOpen sourceWebAPIExtensionLinux8.7From $8 a month - 5
GitHub Codespaces
Free planAndroidiOSWebAPI8.6Free plan - 6
JDoodle
Free planAndroidiOSWebAPI8.6From $4 a month