EnergyVecta

Energy calculators over signed packs. Calculations stay on-device; connects only to check signed paid-license revocations.

EnergyVecta answers everyday energy questions on your device, and shows where every number came from. Free calculators: electricity bills from metered units or with fixed service charges and tax, appliance and standby running costs, water-heater and refrigerator annual costs, EV charging cost per session and per kilometre, and heater running costs - the everyday questions a utility bill raises. Beyond the free set, nine focused packs cover solar PV sizing and yield, battery storage and backup runtime, home efficiency, oil and gas field reference, gas properties (z-factor, pseudo-criticals, density and viscosity), pipeline hydraulics (Darcy and explicit friction, Weymouth and Panhandle capacity, surge screening), gas compression, gas processing, and flare relief screening. Two hundred and seventy-six calculators across ten signed packs in total. Every number is computed by a verified WebAssembly engine over a signed calculation pack - the pack's signature is checked over its exact bytes before it is ever opened. Estimates are labelled as estimates: solar yields are planning aids, not performance promises, and each screen carries its method, assumptions and validity range. Outside that range it refuses and says why, rather than returning a confident wrong answer. Private by default: the engine runs locally. Calculations never use the network and nothing you type leaves your browser. The only background request is a public signed revocation-list check when a paid license is stored; it sends no calculator input, cookies, account data, or request body. Free forever: the everyday calculators, with no account. A one-time EnergyVecta Pro upgrade is available from the hosted CoreVecta checkout; buyers recover or convert their receipt license at https://corevecta.com/activate/ and redeem the signed unlock key in the extension. Pack licenses are separate from Pro; packs you already own can be restored with their signed keys. No subscription. The FlareWorld flare-systems lab is available in the Android app; in the extension its page explains that and stays locked. Estimates are engineering aids, not a substitute for a qualified installer, engineer, or your own utility bill.