Your whole cycle at a glance
Total data used, the mobile/Wi-Fi split, days left in your cycle, and where you stand against your limit — on one screen.
PRIVACY-FIRST DATA TRACKER
See exactly where your data goes.
RheoByte measures your mobile and Wi-Fi usage precisely, every billing cycle — and keeps every byte of it on your phone.
- 100% on-device
- No account
- Per-app breakdown
- Light & dark
FEATURES
Everything you need to understand your data.
Find the data hogs
Every app ranked by usage this cycle. Filter by mobile or Wi-Fi, sort, search, and tap in for a day-by-day history.
Daily, weekly, monthly
Last 30 days, 12 weeks, or 12 months. Spot trends and your heaviest days from history that builds up on-device.
A warning, never a wall
Set a monthly mobile-data cap and get warned as you approach it. It's a soft cap — RheoByte never blocks or throttles anything.
Matches your billing date
Set your reset day and every cycle aligns to your carrier's billing date — so the numbers match what you're billed on.
Looks great, your way
A clean interface with smooth charts. Light, dark, or system — in English, 日本語, 한국어, and 中文.
HOW IT WORKS
Up and running in three taps.
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1
Grant Usage Access
One tap enables the only permission RheoByte needs to read how much data each app has used.
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2
Set your cycle
Tell RheoByte your billing reset day and, if you like, a monthly data limit.
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3
Track every byte
Watch your usage build up day by day, app by app — all on your device.
No data ever leaves this device.
Most data trackers send your usage to a server. RheoByte doesn't have one. There's no account to create and nothing to sign in to. Counting, history, limits, and charts all happen locally on your phone — with no analytics and no ad SDKs.
Reads system usage counters
Computes on-device
Uploads nothing
FAQ
Questions, answered.
Is RheoByte really free of tracking?
Yes. There are no analytics, no ad SDKs, and no servers. Your usage data never leaves your phone.
What permission does it need?
Just Android's Usage Access permission, which lets RheoByte read how much data each app has used. It's the only permission it ever asks for.
Will it block my data when I hit my limit?
No. The limit is a soft cap — RheoByte warns you as you get close, but it never blocks or throttles anything.
Does it track Wi-Fi too?
Yes. RheoByte tracks both mobile and Wi-Fi data and shows the split.
Can I match it to my carrier's billing date?
Yes. Set your billing reset day (1–28) and every cycle aligns to your plan.
Is it available on iPhone?
RheoByte's data tracking is currently Android only.
Do I need an account?
No account, no sign-in. Install and go.
Know where your data goes.
Precise, private, and entirely on your phone.
Get RheoByte on Google Play Android · Free · No account required