We're building the infrastructure for humanity's future among the stars.
Xe4 is a space-systems company with a long horizon. Getting humanity to the stars is the work of generations, and it starts with making the space we already use safe, legible and open to everyone. That's where we begin. Photon, our first product, is step one.
Expand humanity into the stars, starting with the orbit beneath them.
We believe humanity's future is a spacefaring one, and that the companies who build the quiet infrastructure make that future possible. Not the flags and the headlines, but the software, the data and the systems that let more people do more in space, safely.
Every journey outward begins in low Earth orbit, and orbit is filling up fast. Tens of thousands of satellites are launching this decade. Keep it navigable and the door to everything beyond stays open; let it turn to a minefield of debris and we close that door on ourselves.
So we start here, with the least glamorous and most urgent problem: making orbit safe to operate in for the two-person cubesat team and the national operator alike. It's the first rung of a very long ladder, and we intend to build the whole thing.
One horizon, built one rung at a time
A statement of direction, not a delivery schedule. We're at the first waypoint — and everything we build is meant to carry forward.
Photon — collision avoidance, with you in command
Photon is where Xe4's mission meets the day-to-day of running satellites. It ingests public tracking data, screens the fleet against the public catalog, ranks close approaches by an estimated collision probability, and generates low-Δv avoidance candidates for operator review — all as software, with no ground stations to build and less routine screening and alert-triage work for your team.
It's in early access today, being shaped alongside real operators. The physics runs on your own machine; the AI is conservative and its use is logged; and a human always makes the call. Safe orbit is the foundation everything else is built on — so it's what we built first.
Explore PhotonPrinciples we build by
Think in decades
We're building for a spacefaring future, not a quarter. Every product is a rung on a ladder that reaches far past it — so we build things meant to last and carry forward.
Humans stay in command
Our software does the analysis and proposes the action — a person always approves before anything happens. Automation that earns trust by showing its working and logging its use.
Space is for everyone
The frontier shouldn't belong only to those who can afford it. We build on open data and offer free early access to selected operators, so the smallest mission gets the same footing as the largest.
Come build the first rung with us.
Whether you fly satellites today or want to help build what comes next, we'd like to hear from you. The ladder to the stars gets built by the people who show up early.