Observed arrival · 2026-09-14

WattReplay Replays Your Electricity Usage Against Different Plans

wattreplay.com Observed source

Editorial interest 84/100 Selection signal · not a rating of the site

A local, browser-based calculator that compares flat-rate and time-of-use electricity costs from meter-interval CSV files.

Landing page captured for the 2026-09-14 issue.

Field notes

WattReplay accepts interval usage as CSV or editable rows, then groups consumption by local utility hour before applying the entered tariff rules. The interface supports files up to 10,000 intervals and 2 MB, configurable peak windows, weekend treatment, delivery charges, demand charges, and taxes. Its example workspace covers 720 hourly intervals, while saved plans remain in the browser profile rather than being synced or encrypted.

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