About GreyWire Software

GreyWire Software makes tools that work offline, stay private, and never ask for subscriptions. Everything runs in your browser. Nothing phones home — and if it runs in a browser, we've probably stress-tested it to the breaking point and back.

It started in the early '90s with a modded Harpoon naval wargame box set — 10,000 index cards, branching decisions, world simulation before anyone called it that. Dave has been building systems ever since.

That same mindset runs through everything today: MPF, a 67-page open research paper on why patterns exist across all systems. A lineup of browser games — Backyard Kings (high school QB career sim), Bloodline 1200 (medieval life sim), and Nuclear Power Simulator (real-time reactor management). And DualProof: offline time tracking for small teams who don't want payroll software price tags.

GreyWire is built by Dave and a swarm of AI agents — one guy directing a small army of tireless helpers, everything tested the hard way before it ships.

We're not a big company. We're one guy building tools that actually respect the user — because nobody else will.

DualProof — offline time tracking for small teams. Clock-in with PINs, weekly schedules, printable timesheets, manager reports. One HTML file, lifetime license.

Browser games — because the same rules apply to fun: no downloads, no accounts, no ads. Backyard Kings (a four-year high school football career), Bloodline 1200 (a knight's life sim), and Nuclear Power Simulator (try not to melt down).

Everything is tested the way you'd use it — full seasons played, real payroll weeks run, actual breaking things on purpose. If it can't survive real use, it doesn't ship. Our tagline isn't a joke: if it runs in a browser, we've probably set it on fire and put it out again.