Offline-first software
Five Windows apps for solar, batteries, generators, rainwater, and firewood — each a specialist in one pillar of self-reliant living. No internet required. No subscriptions. Buy once, yours forever.
Launch price — saves $70 vs. buying separately · 30-day money-back guarantee
Off-grid living runs on five things: power, battery storage, backup generation, water, and heat. Get one wrong and the whole setup suffers. This bundle covers all five.
Size your solar array, battery bank, wiring, fuses, and inverter. 19 device presets, real battery-chemistry math, worst-month sun toggle, and ballpark system cost.
Protect the most expensive part of your system. Watering and equalization reminders, maintenance log with specific-gravity trends, and a LiFePO4 cycle-life estimator.
For the cloudy weeks solar can't cover. Motor starting-surge presets, 80% continuous-load sizing, and fuel cost per kWh for gasoline, propane, or diesel.
Monthly collection vs. demand with deficit months flagged, recommended tank size, and first-flush diverter sizing — with a supply-vs-demand bar chart.
Heat-load estimate from square footage and insulation, cords-per-season from an 8-species BTU table, wood-vs-propane-vs-electric cost comparison, and a stack inventory tracker.
Grayline's voice-controlled Windows assistant: push-to-talk chat, voice commands, dictation into any window, and an AI brain that runs on your machine — with a holographic assistant that moves as she speaks.
Grayline Software was started by an off-grid radio operator who got tired of spreadsheet guesswork. Every app shows its math, respects real-world details like battery chemistry and motor surges, and runs entirely on your machine.
