The tiniest and fastest
OS in the world
A complete graphical operating system that fits on a single 1.44 MB floppy. Written in assembly, it boots in seconds and runs fast even on 30-year-old hardware.
Download Source codeWhy ColibriOS
Written in assembly
The kernel and most drivers are hand-written in FASM. No bloat, every byte counts.
Instant response
Apps start before you release the mouse button. The system lives entirely in RAM.
Full desktop
Windows, file manager, text editor, web browser, image viewer, games and dozens of tools.
Real hardware
USB, networking, sound, SATA/NVMe, FAT, NTFS, ext2/3/4, exFAT. Boots via BIOS and UEFI.
Runs anywhere
Old PCs, modern laptops, QEMU, VirtualBox and VMware. Minimum CPU: 486DX (a 486 with FPU).
Easy to hack
Build it yourself in minutes. Apps in assembly, C, C--, Oberon, Pascal and more.
Download
| Language | Floppy | CD / ISO | HDD / USB BIOS + UEFI |
|---|---|---|---|
| English0.7.7.0-12708-g39503bc62026-11-15 01:04 UTC | img1.3 MB | iso94 MB | raw97 MB |
| Русский0.7.7.0-12708-g39503bc62026-11-15 01:04 UTC | img1.3 MB | iso96 MB | raw99 MB |
| Español0.7.7.0-12708-g39503bc62026-11-15 01:04 UTC | img1.3 MB | iso94 MB | raw97 MB |
img — 1.44 MB floppy image, the classic way, boots in QEMU with -fda.
iso — CD with extra apps, games and libraries.
raw — disk image, write to a USB stick with dd, Rufus or the bundled Rawrite32.
Built automatically from every change in the main branch. All previous builds: builds.colibrios.org/history.