Know exactly what every mile costs you.
GarageWatts automatically tracks your home EV charging and shows your real cost per mile — based on your actual electricity rate, from your actual charging sessions.
No guessing. No manufacturer app. No $25/month subscription.
"But is it actually cheaper?"
You've said it: EVs are cheaper to drive than gas cars. You probably believe it. But when someone asks for a number, most EV owners guess.
GarageWatts gives you the number. Not an average. Not a calculator. Your actual cost per mile, from your actual charging sessions, at your actual electricity rate.
Set it up once. It runs forever.
Plug in the Shelly
The Shelly Plug US Gen4 ($20) plugs into your outlet. Your charge cable plugs into the Shelly. That's the setup. No electrician. No wiring. No expertise required.
Buy Shelly Plug on Amazon — $20GarageWatts does the rest
Every time you charge, GarageWatts captures the session automatically. kWh delivered. Start and end time. Cost in dollars. No apps to open. No forms to fill out.
See your numbers
Your dashboard shows cost per session, cost per mile, efficiency, and monthly totals. Updated automatically after every charge.
GM wants $25/month for less.
| GM Connected | GarageWatts Pro | |
|---|---|---|
| Monthly cost | $25/month | $3/month |
| Charging notifications | ||
| Cost per session | ||
| Cost per mile | ||
| Efficiency trends | ||
| Data export | ||
| Works on any EV | ||
| Annual cost | $300 | $36 |
Everything you need. Nothing you don't.
Shelly Plug US Gen4
Level 1 (120V) home charging
One-time purchase. No subscription. Plugs into your outlet in 30 seconds.
Buy on AmazonThat's it to get started.
OBDLink MX+
Want odometer tracking too?
Reads odometer and battery automatically. Stays plugged into your OBD port. Required for the mobile app (coming soon).
Buy on AmazonYou break even on hardware in month 7.
After that you're saving $264/year. Permanently.
Start tracking for free
No credit card required. Log your first session in under 2 minutes. See your pricing options.
GarageWatts participates in the Amazon Associates Program and may earn a commission on qualifying purchases at no additional cost to you.