Software you can run, read and keep
We're building an open ecosystem of construction apps that run on your own hardware. Your drawings, bids and job records stay with you. We hold nothing.
Why we build it this way
A contractor's files are some of the most sensitive things it owns: bids, drawings, contracts, and the numbers behind every job. More and more of that work lives on servers the contractor doesn't control, under terms that can change every renewal.
We think it should be the other way around. The software should come to your office, run on your hardware, and answer to you. You should be able to read the code that touches your drawings. And if we ever went away, the software you bought and the data you made should keep working.
Excalibur Construction Technologies was started in Pueblo, Colorado by Creede Guardamondo, a project manager and estimator in structural steel. The apps are built around how the work gets done in a real office, starting with drawings and takeoff.
What every app is built on
Self-hosted
Every app runs on your computers and your servers, inside your network. There's no Excalibur cloud to sign in to.
We hold nothing
We never receive your drawings, markups, bids or records. No analytics, no usage tracking, no crash reports sent to us.
Open source
You should be able to see exactly what software does with your files. We're publishing the source code as each app is ready.
Pay once
Software is bought, not rented. Updates are optional, and the version you have keeps working if you stop paying for them.
Open formats
Markups are standard PDF. Takeoff exports to Excel, CSV and JSON. Every app has a documented API so your tools can talk to each other.
Numbers you can trace
Every quantity comes from something a person clicked. When something's missing, the software says so instead of guessing.
The ecosystem
Each app works on its own, and they're designed to work together on your own server.
| App | What it does | Status |
|---|---|---|
| Excalibur View | Drawing viewer, markup and takeoff for Windows, with an Office server for teams | Available. Mac planned. |
| Excalibur Citadel | Project management for general contractors: bids, drawings, RFIs, daily reports, contracts and a partner portal | Early access |
| More apps | Estimating, fabrication management and field tools, built on the same rules | In development |
What we won't do
- Host your drawings or records on our servers
- Track how you use the software
- Switch off software you bought because you stopped paying for updates
- Push an update to your office without your say
- Let an AI draw on your drawings without a person clicking to accept it
Want to help shape it?
Tell us what your office needs. Early feedback decides what we build next.