Voltmeter

FirstSoft

About this app

Voltmeter puts your TeslaMate data on your phone — natively, with no web views.

TeslaMate is the popular self-hosted data logger for your car. Voltmeter connects to the Grafana that ships with it and turns that data into a fast, focused app.

AT A GLANCE
• Battery level, range and car state, refreshed while the app is open
• Last 24 hours of battery, with charging sessions highlighted
• Last 7 days: distance, energy used, efficiency and charging cost
• Your latest drive and charge, one tap away

DRIVES
• Every drive grouped by day, with distance, duration, efficiency and battery used
• Week, month and year summaries
• Drive detail with the route on a map, speed and elevation, and energy used

CHARGING
• Monthly spend and energy, with a six-month history
• AC/DC mix and every session with charger type, power and cost

DASHBOARDS
• TeslaMate's Grafana dashboards rebuilt natively: Battery Health, Charge Level, Projected Range, Vampire Drain, Drive Stats, Efficiency, Mileage, Charging Stats, Statistics, States, Temperatures, Updates, Locations, Trip and Visited
• Pin your favourites with a live value and sparkline
• Time ranges from 24 hours to all time

PRIVATE BY DESIGN
• Your car data comes only from the server address you enter. There is no Voltmeter account, cloud or tracking.
• Maps use free OpenStreetMap tiles from OpenFreeMap; your positions are drawn on the phone and never sent anywhere.
• Your API key is stored in the device's secure storage.
• Units follow your TeslaMate settings (km or miles, °C or °F).

WHAT YOU NEED
• A running TeslaMate installation with its Grafana reachable from your phone (on your network or over a VPN)
• A Grafana service account token with the Viewer role

No server yet? Tap "Explore with demo data" on the welcome screen to look around.

Voltmeter is an independent app. It is not affiliated with, endorsed by or sponsored by Tesla, Inc. or the TeslaMate project.

What’s new

• Compare drives: put two trips side by side on one map, with every stat compared (3+ with Voltmeter Pro)
• Trip timeline: replay a drive and scrub through speed, power, battery and temperatures
• Set a charge's cost from the app via your TeslaMate
• Fixes and layout polish