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StopWatt

How to measure results

StopWatt before and after: measuring it properly

'Before and after' photos and bill screenshots are common in ads for energy gadgets, but they are easy to stage or take out of context, and we won't publish any we can't verify. Instead, this page walks through exactly how to build your own credible before-and-after comparison at home.

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Quick answer

We don't publish customer bill screenshots because we can't verify the conditions behind them (weather, occupancy, rate changes). We'd rather help you run your own controlled comparison.

Why we don't publish before/after bill screenshots

A screenshot of a bill total dropping between two months could be caused by weather, occupancy changes, rate changes, or a shorter billing cycle — not necessarily anything you installed. Without controlling for those variables, a screenshot proves very little, so we'd rather show you how to do a controlled comparison yourself.

The variable to isolate: kWh, not dollars

Your bill total in dollars moves with utility rate changes, time-of-use pricing, and seasonal demand charges — none of which have anything to do with StopWatt. Kilowatt-hours (kWh) consumed is the number that reflects actual usage, so that's what a fair before-and-after should compare.

A simple before-and-after protocol

PhaseDurationWhat to record
Before1-2 full billing cyclesTotal kWh, major appliance run patterns, thermostat settings
InstallDay 1Placement location(s), date, outlet used
After1 full billing cycle minimumTotal kWh under the same routine and similar weather
CompareAfter cycle endskWh vs. before, and vs. same month last year

Controls that make your comparison meaningful

  • Compare against the same calendar month a year earlier when possible, to reduce weather bias.
  • Keep thermostat setpoints and major appliance habits roughly consistent across the two periods.
  • Note any changes in occupancy (guests, vacations) that could skew usage independent of the device.
  • If you have a smart meter or utility app with daily/hourly data, use it — daily-resolution data isolates changes faster than a single monthly total.

What a realistic result looks like

In homes with meaningful motor-driven load, a modest reduction in kWh is plausible; in homes with mostly resistive loads or already-efficient wiring, a fair comparison may show essentially no change. Both outcomes are legitimate results of a fair test — the point of the protocol above is to know which one you actually got.

If your before-and-after doesn't show what you hoped

That's exactly the situation the guarantee is for. You can return the units within 60 days of delivery for a refund of the purchase price, no elaborate justification required.

Every order from this official store includes free worldwide shipping, delivery in 1-2 business days to processing, and a 60-day money-back guarantee on the purchase price.

60DAYS

60-Day Money-Back Guarantee

Test StopWatt for a full billing cycle. Return it within 60 days of delivery for a refund of the purchase price.

Issued by the official StopWatt store · Refund of the purchase price

Frequently asked questions

Can you show me real before-and-after bills from customers?
We don't publish customer bill screenshots because we can't verify the conditions behind them (weather, occupancy, rate changes). We'd rather help you run your own controlled comparison.
How long should I test before deciding?
At least one full billing cycle under your normal routine, ideally compared against the same month a year prior to reduce weather-driven noise.
What number should I actually compare — dollars or kWh?
Compare kWh. Your dollar total is also affected by rate changes and time-of-use pricing that have nothing to do with the device.
What if my before-and-after shows no change?
That is a possible, legitimate outcome depending on your home's wiring and appliance mix. Return the units within 60 days for a refund of the purchase price.

Keep reading on the official StopWatt site

Ready to order? Buy StopWatt direct or compare StopWatt bundle pricing.

Order direct from the official store

Ready to try StopWatt risk-free?

Pick the bundle that matches your home size, then complete your order securely on this page — no redirects, no account required.

Sizing rule of thumb: one device per 800–1,200 sq ft, so most homes over 1,500 sq ft use the 3-device bundle.

Checkout — 3 Devices

$105.84

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Prices in USD. The bundle price shown is the full discount — there is no code to hunt for. Add-ons available only here: add 1 extra stopwatt and 3-year replacement protection.