The kernel
should get out of the way.

AetherXOS is an exokernel + Library OS featuring standard POSIX-like, UNIX-like, and Linux-compatible system call/API targets. By exposing raw hardware resources safely, AetherXOS eliminates monolithic abstraction taxes to deliver unparalleled bare-metal performance.

Download release Read the architecture — ★

syscall: —
throughput: —
bootstrap: —

aetherxos@bootloader:~ — /boot/serial0

█

// capabilities

One kernel. Many shapes. Zero compromises.

Built from scratch in Rust. Designed for compute, networking, and storage workloads where every cycle matters.

Exokernel Core

Bypass the monolithic abstraction tax. Applications talk to hardware directly through capabilities — securely.

syscall_latency: live

Library OS Abstractions

Compose your runtime target: POSIX-like capabilities, UNIX-like signals, real-time loops, or unikernels. Swap the entire OS stack on a per-process basis.

libos_layers: modular

Extreme Configurability

Kernel-free scheduling, custom paging, application-specific IPC. Tune the OS to your workload.

config_knobs: extensible

Memory Safety

Capability-table protection plus W^X enforcement. Rustified core, isolated drivers, zero ambient authority.

CVE_score: audited

Bare-metal Speed

Zero-copy I/O, direct page-table control, user-level interrupts. Faster than your hypervisor.

throughput: hardware-bound

Built for the network era

100 GbE userland stack, io_uring-style queues, NIC offload primitives baked into the ABI.

rps: workload-dependent

// build your own LibOS

A 6-line userland kernel.

Compose the exact runtime your application needs. Drop the POSIX layer, drop the scheduler, drop anything. The exokernel just gives you the metal — you decide the shape.

Read the developer guide

// aether/libos/echo.rs
use aether::cap::{Nic, Sched};

fn main(nic: Nic, sched: Sched) {
    loop {
        let pkt = nic.recv_zerocopy();
        nic.send(pkt);
    }
}

Boot it. Benchmark it. Believe it.

AetherXOS runs today on x86_64, arm64, and RISC-V. Grab the beta preview ISO, flash a USB stick, and rediscover what your hardware can do.

Open Download Center

The kernelshould get out of the way.