About Grayline
Grayline Software started the way most good tools do — out of frustration. Sizing an off-grid solar system meant bouncing between free online calculators that contradicted each other, hid their assumptions, and needed an internet connection you don't have at the cabin.
So the math got written down, checked against the real world, and turned into software that works anywhere: a load audit that respects battery chemistry, a battery monitor that reminds you before neglect gets expensive, a generator sizer that accounts for motor starting surges, a rainwater planner that flags your dry months, and a firewood calculator that tells you if you're short before January.
Your tools should work where you work. Every Grayline app runs 100% offline. No accounts, no cloud sync, no phoning home — your data never leaves your machine. If the grid goes down, your planning software still works.
Show the math. Every number on screen comes with the steps behind it. You can check our work, argue with it, and adjust it — because a black-box answer you can't verify is just a guess with better marketing.
Buy once, own it. No subscriptions, no ads, no feature gates. You pay once and the software is yours, updates to v1.x included.
The grayline is the twilight boundary on a radio propagation map — the line between day and night where HF signals travel farthest. It's where self-reliant people have always operated: between the grid and the wilderness, making do with what they have and knowing exactly how it works.
