Get the app
Windows 10 / 11 Free — Pro included 14 languages

Your PC is on the electricity bill. Now you can read the line item.

PCWattVault measures what your machine actually pulls from the wall, prices it with your own tariff — night rates, tiers, solar and all — and keeps recording in the background so the history never has holes.

No accountNo cloudNo telemetryMIT-licensed code
Live demo SIM · demo tariff €0.19/kWh
Current draw
278W
PSU-measured at the wall
Cost rate
0.053/h
standard tariff
Today
€0.17
894.7 Wh
This month
€2.91
15.32 kWh
Month-end
€30.08
158 kWh
At current draw — if it ran 24/7
€0.053per hour
€1.267per day
€8.87per week
€38.01per month
Live wall power 5m30m1h6h24h
400 W300 W200 W100 W0 W
-300s-150s0s
Where the watts go
CPU GPU Memory Storage Base load PSU loss
Simulated preview of the real dashboard — your figures come from your own hardware.
Since you
opened this page
00:00elapsed
0.000kWh
€0.000spent
At a simulated draw. A real 300 W gaming PC costs roughly €1.37 per 24 h at €0.19/kWh.
01 — MEASURE

Six answers your power bill never gives you

Everything below runs locally, updates every second, and keeps working while the window is closed in the tray — because a history with holes is worth nothing.

PCWattVault — Dashboard Actual app
The PCWattVault dashboard: 278 W current draw measured at the wall, cost rate per hour, today and this month in euros, a month-end forecast, a live wall-power chart over the last five minutes, and a donut breaking down where the watts go between CPU, GPU, memory, storage, base load and PSU loss.
Live dashboard — real hardware, real tariff, recorded continuously in the background.
Right now

Wall power, not guesswork

Component sensors plus base load, divided by your PSU efficiency — or a genuine measurement when a digital PSU or smart plug is attached. The badge always tells you which one you are looking at.

GPUCPUDrivesBase + PSU loss
Per device

Every consumer, ranked live

Two GPUs? Each appears separately with its own draw. CPU, drives, everything with a sensor of its own — ranked in real time. A “~” marks anything the app estimated rather than measured, so you always know how solid a number is.

RTX 3090248 W
Ryzen 9104 W
NVMe~8 W
History

Hourly, daily, monthly — forever

Today by the hour, 30 days, 12 months, lifetime totals — in kWh or in money, with a per-component breakdown.

Tariff engine

Priced the way you are billed

Time-of-use windows, weekday and seasonal rules, consumption tiers with a household baseline, solar hours, demand charges. Any currency.

23–07 NIGHT 07–17 DAY 17–23 PEAK
Ahead of time

Forecast & predictions

Where this month will land, and — after ten recorded days — next month and next year as honest ranges, not fake precision.

€24
€31
02 — CALIBRATE

The feature that makes the numbers honest

Most tools stop at “here is an estimate”. PCWattVault lets a real measurement teach the estimate — once — and then keeps being accurate even after you take the meter away.

  1. Plug the PC into a Tapo P110/P115Or use a digital PSU (Corsair iLink, NZXT). Whatever sits on the plug is what gets measured — so put only the PC on it.
  2. The dashboard switches to “measured at the wall”History and costs are now recorded from the real reading. If the plug drops off Wi-Fi, the software model takes over within seconds — no hole, no frozen number.
  3. A calibration bar appearsMeasured vs model, and the average gap over the last few minutes. Do it at your normal desktop load, not mid-benchmark.
  4. One click folds the gap into your base loadThat is the whole point: the model itself becomes honest. Your figures stay realistic when the plug is offline — or even if you remove it for good.
Calibration · last 5 min
Measured — Tapo P110312 W
Software model276 W
Average gap+36 W
↺ Tune base load by +36 W

A large gap is not a bug — it usually means fans, pumps, RGB and USB gear were under-counted. Which is exactly what the button fixes.

03 — KEEP

An app that measures your electricity has no business phoning home

PCWattVault is local-first in the strict sense: there is no account to create, no server to sync with, and the interface is physically prevented from making network requests.

0

Accounts, sign-ups and cloud services. The app works the second it opens.

0

Telemetry, analytics and crash reporting. Nothing is collected — not even anonymously.

JSON

Your history is plain readable files in your own profile. Copy them to back up, delete them to erase everything.

Content-Security-Policy: connect-src 'none'  ·  the UI cannot open a network connection, by construction

Raw per-second samples are never written to disk — only hourly aggregates per component category, so nobody can reconstruct your minute-by-minute activity from the files. Smart-plug credentials, if you use that feature, are encrypted with Windows DPAPI and are used only to talk to the plug on your own network. Read the full inventory →

04 — EXTRAS

Pro features, and the promise attached to them

The free app is complete: tariffs, history, forecasts, predictions, themes, 14 languages. Pro adds the things you ask for once you have lived with the data for a while.

Alerts

Windows notifications when temperature, wall power or the daily cost crosses your thresholds. Anti-spam built in.

Sessions

“What did that gaming night / render / training run cost?” Every session records kWh, cost, peak and average watts.

Reports & export

Excel-friendly CSV and a monthly PDF with charts, tariff summary, predictions and a CO₂ line.

Smart plug

Connect a Tapo P110/P115 and your history is recorded from real wall measurements instead of a model.

Founder
license

Right now, every Pro feature is free — and that is a promise, not a trial. While PCWattVault is young, each installation records a Founder / Early-Adopter marker. If Pro ever becomes a paid upgrade for new users, installations carrying the marker keep everything at no cost, forever. Nothing to claim: yours is already under Settings → PCWattVault Pro.

05 — INSTALL

Install in one click. Go full depth in two more.

PCWattVault ships through the Microsoft Store — sandboxed, auto-updated, removed cleanly if you ever uninstall. Out of the box it measures GPU power directly and estimates the CPU; pair it with one free tool and every sensor becomes a real measurement.

Microsoft Store

Free

Install, done. Sandboxed and updated by Windows.

  • One-click install and automatic updates
  • The full app: tariffs, history, forecasts, sessions, reports — every Pro feature free for early adopters, forever
  • GPU power measured directly from day one
  • No account, no telemetry — nothing ever leaves your machine
  • CPU power is estimated (“~”) until a sensor source provides it — see the next card
Open in the Store

Full sensor depth

Optional power-up

Want measured CPU power, temperatures and fan speeds instead of estimates? Pair PCWattVault with the free, open-source LibreHardwareMonitor.

  • Install LibreHardwareMonitor — its installer includes the PawnIO sensor driver it needs
  • Flip one switch: Options → Remote Web Server
  • PCWattVault detects it and switches automatically within seconds — the “~” marks disappear
  • Close it any time: PCWattVault hands back to its estimates seamlessly, your history never skips a beat
See how, step by step
06 — ASKED

Before you install

Why does the CPU show “~” or 0 W?

Reading real CPU package power on modern Windows needs a driver-backed sensor source. Install the free LibreHardwareMonitor — its installer includes the PawnIO driver it needs — and turn on Options → Remote Web Server; PCWattVault picks it up within seconds and the tildes disappear. Until then it estimates CPU power from load, which is exactly what the “~” is telling you. GPU power is measured directly either way.

The app doesn’t close when I close the window.

By design. It keeps recording from the notification area, because a history with gaps is useless. To really quit: right-click the tray icon → Quit, or turn off Settings → Behaviour → Keep recording in the tray.

What is the yellow “Demo data” banner?

It means no real sensor source could be reached, so the app is showing synthetic numbers to keep the interface alive and explorable. Demo data is never written to your history.

My NVMe temperature differs from the vendor tool.

PCWattVault shows the official composite sensor — the same one Samsung Magician and similar tools display. Some utilities show the controller hotspot instead, which legitimately runs 20–30 °C hotter.

Are sleep and hibernation billed?

Never. Gaps in time are detected and excluded from the energy integration, so a weekend of sleep does not silently become kilowatt-hours.

Do I have to give the app my TP-Link password?

Only if you use the optional smart-plug feature — that is how Tapo authenticates apps on your own network. The credentials are stored encrypted with Windows DPAPI, are used solely for the local handshake with the plug, and are never sent to the internet. “Clear credentials” deletes them immediately.

Find out what your PC has been quietly adding to the bill.