private fucking fitness tracker
"We didn't build a fitness app. We built a vault that happens to track your workouts. Your data lives on your device, encrypted, never uploaded, never sold, never even seen by us."
the problem
$trava
$ells your
$hit*
*by $hit we mean YOUR data
Every major fitness app is selling your data.
Every single motherf*cking one.
Even to insurance companies — so they can jack up your rates. John Hancock requires fitness tracking on all new life insurance policies. Your premiums are adjusted based on your activity data. Miss your step goals? Pay more.
Data brokers buy your workout routes, heart rate patterns, and location history from these companies. Insurance firms use it to adjust your premiums. Advertisers use it to target you. Government agencies purchase it without a warrant. Your "free" fitness app costs you your privacy.
them
Cloud servers · User accounts · Data brokers · Targeted ads · Insurance risk scoring · 61 million records leaked
PFFT
Your device only · Zero accounts · Zero servers · Zero ads · Zero data collection · Literally cannot see your data
Sources: Surfshark 2025 fitness app privacy study · Incogni 2024 fitness app research · Consumer Reports 2025 connected fitness investigation
what you get
AES-256-GCM encryption on every workout. Biometric lock on app launch. Your data is unreadable without your face or fingerprint.
High-accuracy GPS with Kalman-filtered speed. Background tracking that keeps working when you switch apps. Auto-pause when you stop.
Learns your movement patterns. Gets smarter after every workout. GPS-only mode for e-bikes and skiing. No false pauses, no missed stops.
worldSTATS: rank against the global population using CDC/WHO data — without sharing a byte. nerdSTATS: deep cuts, burn rates, animal speed comparisons, workout personality, and earth laps.
Every route you've ever tracked, overlaid on one beautiful dark map. Filter by activity. Color-coded by type. Your movement history visualized.
Dark UI. Dark map tiles. PFFT green accents. JetBrains Mono typography. Custom SVG icons. Designed for people who care about how things look.
9 activities
the deep cuts
The weird, beautiful, obsessive stats nobody asked for but everybody wants. Computed locally from your workouts — never shared.
sample data — your nerdSTATS are computed from your actual workouts
zero data shared
See where you rank against the world — without your data ever leaving your phone. Rankings computed locally using published population statistics from CDC, WHO, and ACSM research.
No server. No network calls. No opt-in. Pure PFFT.
10% of every purchase
PFFT CHARITY PARTNER
Providing free music lessons to kids who need them most.
PFFT donates 10% of every purchase to our charity partners — follow the money @ pfft.app
PFFT SPONSOR
Transforming functional mushrooms into everyday nutrition.
MONEY DONATED
pre-launch — donations begin when Pro subscriptions go live
coming soon
Share workouts with family and friends — end-to-end encrypted. Create a circle via QR code. See everyone's routes on one shared polymap. Nobody outside the circle can read your data. Not even us.
2–12 people per circle · AES-256-GCM
zero-knowledge architecture
We use mathematics — not promises — to protect your privacy. Every workout shared in a circle is encrypted with a key that only circle members have. There is no server that can read your data. The relay (if used) sees only encrypted noise. We couldn't decrypt it even if we wanted to. That's not a policy — it's math.
launching may 2026
Be first to know when PFFT hits Google Play. No spam. No data collection beyond your email. Obviously.
your email is stored by our mailing list provider only. PFFT never sees or stores it.
the audit
questions