Hakari is a privacy-first weight and body-composition logger.
Your measurements never touch a vendor cloud: they live encrypted on
your device and back up to your own Nostr relays, NIP-44 encrypted so
relays only ever see ciphertext.

Features

Standard Bluetooth GATT scales (Weight Scale 0x181D / Body
Composition 0x181B) work fully offline — step on, reading appears
Full TANITA-style body composition: body fat %, water %, muscle
mass, visceral fat, bone mass, BMR, metabolic age
TANITA Health Planet cloud import (official API) with full-history
paging for TANITA scale owners
Health Connect / Apple Health sync (weight & body fat read/write)
Workout-readiness & fat-loss-efficiency card from your sleep and
activity (research-based, transparent heuristic — tap ⓘ for the
methodology)
Nostr backup: kind 1351 weight events (NIP-101h) plus encrypted
kind 30078 full-entry backups; restore from relays on any device
Amber (NIP-55) signing — the app never sees your key; silent
ContentProvider signing under "always approve"
Tor support via Orbot SOCKS5 proxy
Encrypted local storage (Keystore-backed), WeightLogger-compatible
CSV / JSON export
No telemetry. No analytics. No accounts.