Energy & data intelligence for your devices
WattByte turns battery, network and energy usage into clear insights, costs and recommendations.
Battery used
0mAh
becomes energy
0.0Wh
and costs about
€0.0021
Example data. Not a real user.
Energy used
0.0 Wh
0 mAh of battery, about €0.0021
Mobile data
0.0 GB
Wi-Fi
0.0 GB
Insight
Your energy use was approximately 18% higher than your recent average. Most of the increase occurred between 14:00 and 17:00.
The dashboard is the whole product in a glance: what the phone used today, what that is in energy, and the estimated cost at your local electricity price.
Example data. Not a real user.
Battery used
0mAh
Energy
0.0Wh
Estimated electricity cost
€0.0021
At your local price per kWh
Mobile data
0.0GB
Wi-Fi
0.0GB
Energy through the day
Wh per hour
Battery, energy, mobile data and Wi-Fi are measured separately and kept side by side, so a change in one is easy to see against the others.
Understand where your battery goes instead of staring at another percentage.
Level
23% to 100%
Charge added
3,520 mAh
Energy
13.6 Wh
Turn battery usage into actual energy and estimated electricity cost.
See what the cellular connection actually moves, day by day.
Daily totals: 1.2, 0.9, 1.8, 1.1, 0.6, 2.1, 0.5.
12% less than the previous week.
Wi-Fi is counted on its own, so you can see how much of your traffic never touches the mobile plan.
Every day is kept on your phone, so a spike can be traced back instead of guessed.
Example data. Not a real user.
WattByte automatically adapts currency, regional settings and energy pricing to your location.
Region comes from, in order: device region, system locale, country detection on the server, your own choice. No location permission is requested and no location is stored.
Your setup
Detected in a few seconds. Edit any value, then continue.
Region
device region
Currency
follows region
Electricity price
public household average
Battery capacity
device catalog, Pixel 8
Example data. Not a real user.
For supported countries WattByte uses the household electricity price published by Eurostat, taxes included. Elsewhere you enter your own tariff.
Country
Poland
Currency
PLN
Estimated electricity price
1.27 PLN / kWh
Source: Eurostat nrg_pc_204, first half of 2026. Household consumers, consumption band DC, all taxes and levies included, national currency.
WattByte AI reads the totals your phone already computed and explains them in plain language.
The questions an insight answers
Why was my battery usage higher today?
Your energy use was approximately 18% higher than your recent average. Most of the increase occurred between 14:00 and 17:00.
Based on your WattByte usage data
Example data. Not a real user.
The AI layer is a gateway, not a single model. Each request is routed to one configured provider; after an outage or a rate limit, at most one other provider is tried. Your totals are never sent to every provider at once.
WattByte app
sends period totals
WattByte API
quota, validation, keys
AI gateway
routing, retry, one fallback
One provider is asked per request. Which one is a server setting, never a choice the app or a request can make.
Daily and weekly totals are built on the phone. Weekly and monthly AI summaries turn them into a few sentences you can act on.
Mon 13 to Sun 19 Oct
Example data. Not a real user.
Weekly and monthly summaries can also be written by WattByte AI from the same totals.
Rule-based, no network needed. They appear after a few days of use.
Export everything WattByte stores on your phone from Settings, in formats a spreadsheet or a script can read.
If you use cloud sync, the server keeps a JSON and CSV export of your account too.
day,mobile_rx_bytes,mobile_tx_bytes,wifi_rx_bytes,wifi_tx_bytes,total_bytes,estimated
2026-10-19,612480102,187620442,9833214007,2512890110,13146204661,falseWhat the app stores, what it sends and what it never does, in plain language. The full policy says the same thing with more detail.
Measurement happens on the phone. The backend only holds accounts, optional daily totals and the AI gateway.
Reads system counters, builds charging sessions and keeps everything in local SQLite. Home-screen widgets on both platforms.
Accounts, optional cloud sync of per-day totals, device catalog and the electricity price cache. Every route is described by an OpenAPI schema.
One interface over four providers with routing, retry, a single fallback and spend limits.
The same app, the same numbers, on iPhone and Android. Your data stays on each phone unless you sync it.
iOS
iPhone with iOS 15 or later
Android
Android 10 or later
The free plan is the whole core app. Pro will add depth for people who want more history and more AI.
Everything you need to see what your phone uses today.
Pricing announced at launch
More history, more reports and a larger AI allowance.
Pricing announced at launch
The final contents of Pro are confirmed at launch.
WattByte is a mobile app for iPhone and Android that shows how much data and energy your phone uses: mobile and Wi-Fi traffic, battery used, estimated energy in Wh and kWh, and the estimated electricity cost. It turns system counters into numbers you can read.
From the counters the operating system exposes. Where the phone reports an energy counter it is used directly; otherwise charge in mAh is multiplied by the battery voltage, and if no counter exists at all, the change in battery level is multiplied by the design capacity of your phone model. Wh becomes kWh, and the wall energy adds a charging efficiency you can adjust. Values that rely on an estimate are marked as such.
No. Phones have no power meter an app can read. WattByte reads the battery and network counters the system provides and calculates or estimates the rest from your device parameters. It is an estimate of what the battery took in, not a reading from your wall socket.
It is designed not to. Counters are read when you open the app, in a short background refresh a few times an hour, and on Android once a minute only while the phone is charging. There is no always-on service.
No. It never asks for location permission. The region used for currency and electricity price comes from your device region setting or system locale, and you can change it by hand.
No. There is no advertising SDK, no analytics SDK and no tracker in the app. Usage data stays on your phone unless you switch on cloud sync, and even then only daily totals are uploaded.
Understand your battery, data and energy usage in one place.