Frequently asked questions
Is Domainless Code free?
Yes — it's a free browser code editor. Open it and start typing; your work runs instantly in the live preview.
What can I build with it?
Anything HTML, CSS, and JavaScript can do. Each pen has three editors, a console, a security scan, and settings for head HTML and external libraries (curated and version-pinned).
Can I write assembly, C, or Lua?
Yes. Pick a mode in the editor: asm (BIOS) assembles 16-bit x86 with NASM and boots your boot sector in an in-browser emulator; C (UEFI) compiles a UEFI application with the GNU-EFI toolchain into a downloadable .efi; and Lua runs in your browser and renders to the page. HTML, CSS, and JS web pens work exactly as before.
Can I share or embed my pens?
Yes — pens can be shared by link with public, unlisted, or private visibility, and embedded in your own site.