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For Tesla owners

Know your costs,
know your pack.

See where your energy goes, how your battery is treated, and how your Tesla compares.

Connect my TeslaLive demo →

30 days free. No card. About a minute to connect.

✓ Built by a battery data scientist✓ Read-only✓ No location✓ Official Tesla Fleet API
01

Stop paying for energy you didn’t mean to spend.

Sentry, parked climate, idle drain. See what used your energy and decide what is worth it.

Founder’s carLast 30 days

Energy spent while parked

7.85 €
Total energy
37.04 €
78.8%
Driving29.19 €
Parked climate4.21 €
Idle drain1.87 €
Sentry1.37 €
Unattributed0.41 €
Regen+10.40 €recovered · 35.6% of driving

Estimated cost at €0.21/kWh.

02

Care for your battery. Keep the record.

See time spent at each charge level and temperature. Understand your habits today and keep a history for the next owner.

Last 30 daysFounder's car
See this view in the demo →
03

Find out how your car compares.

Compare consumption with connected Teslas of your model, across speeds. See where you stand and what deserves a closer look.

Consumption vs speedReal community data
kWh/100km201510507090110130km/h
This carModel Y Long Range AWD
How it works

Connect once.
Drive normally.

01

Connect your Tesla

Read-only access through Tesla’s official Fleet API. About a minute.

02

Go about your day

Trips and charges record automatically. No manual logging.

03

See what adds up

Explore your energy use and battery conditions as your history grows.

Your next drive could tell you more.

Connect my Tesla · 30 days free

Your history starts when you connect. No card needed.

The Cellmetry community

Real cars. Real kilometres.

Teslas in the community
27
Kilometres recorded
136,104
Trips recorded
6,481

“It’s a more comprehensive app than any other that I know of for tracking Tesla battery health.”

Robert, California · Two Model 3s on Cellmetry
Pricing

Start free.
Then $6.90 / car / month.

30 days
free · no card · from your first data
then $6.90 / car / month
  • →Find the energy costs you can change
  • →Understand your battery habits and keep the history
  • →Compare consumption with other Teslas of your model
  • →Every drive and charge saved, with notes and export
Connect my Tesla · 30 days freeNot sure? See the live demo →

Cancel any time. Your recorded history stays readable.

Founder
Olli Ruokojoki

“I'm a battery data scientist. I wanted to see what my own Tesla's pack was actually doing, and nothing on the market showed it properly. So I built Cellmetry.”

Olli Ruokojoki
Battery data scientist · Master of Science in Physics, Aalto University
FAQ
Is my data safe?+
Cellmetry connects through Tesla's official Fleet API with read-only access: it can read what your car reports, but it cannot unlock, drive or change anything. It never collects GPS location. Your data is hosted in Finland and never leaves the EU, and you can remove your car at any time.
What does Tesla share with you?+
The data we request permission for through the Tesla Fleet API, such as trips, charging sessions, state of charge, battery temperature and power. We turn that stream into readable views. We never touch controls, location history, or anything you don't see in your own dashboard.
Will it wake my car or use battery?+
No. Cellmetry listens to the telemetry stream your car already sends. It never polls or wakes the car: when the car sleeps, it sends nothing and nothing is asked of it.
Can other people see my car?+
Fleet comparisons are public without an account, under stable pseudonyms or optional public aliases, never your name or location. Pseudonyms do not guarantee anonymity. BattMobile is a separately authorised detailed showcase. See the Privacy Policy for retention and your rights.
What happens when the trial ends?+
After 30 days it's $6.90 per car per month. If you don't continue, your history stays read-only, nothing is deleted unless you ask.
Which cars work?+
Model 3, Model Y, Cybertruck, and Model S and Model X from the 2021 refresh onward, in Tesla's Europe and North America regions: that covers cars bought and registered in Europe, the US, Canada, and most of Asia-Pacific. Model S and X built before 2021 can't stream telemetry through Tesla's API, and China isn't supported. Connect as many cars as you own, billed per car.
Do my old trips show up?+
Recording starts the moment you connect. Tesla's stream doesn't include the past, so history can't be imported: one more reason to connect sooner rather than later.
How are the energy categories worked out?+
Charge level, battery temperature and power are values your car reports. The split of parked energy into sentry, climate and idle drain is attributed from those recorded readings and their timing. Anything that can't be confidently placed is shown as unattributed rather than guessed.
Do you sell my data?+
No. We do not sell personal data to advertisers. Fleet readings and comparisons are public under stable pseudonyms or optional public aliases, as described in the Privacy Policy.
When you're ready

Your car has the answers.
Start asking.