Purpose and operator
About ChargeWindow
ChargeWindow turns an EV charger tariff you enter into a whole-session cost. It is built for residents who cannot choose their building’s charger provider and need to see more than the advertised energy rate before charging.
The problem it records
A building charger can charge for energy, a session, connected time, and idle time. An energy-only rate does not show the cost of the session you plan to make. ChargeWindow adds those components, then shows the effective cost per kWh and driving cost from your vehicle consumption.
Read the fee anatomy guideWhat you buy
The browser calculator costs £29 once, with no account or subscription. Enter the provider’s current tariff and session details yourself. Calculations run locally; one tariff can be saved in your browser. The provider, charger, building notice, or contract remains the source for current prices and rules.
It does not fetch live prices, choose a charging time, control a charger, or promise savings. If a fee rule is unclear, check it with the provider before relying on an estimate.
Who makes it
ChargeWindow is made by Wolven Tech and sold by WOLVEN TECH ADVISORY LTD, UK company 16811183. Wolven Tech is the owner; ChargeWindow is this calculator.
Questions or access trouble
Keep your purchase receipt. For calculator access or a fee-rule question, use the support instructions or email us. Do not send payment-card details or a private checkout return link.