The idea
Your phone is a sensor. Fin shows you what it picks up.
Fin is a polished, phone-native "Flipper-lite." It reads and writes NFC tags, runs a safe Host Card Emulation demo, scans for nearby Bluetooth LE advertisements, inspects your Wi-Fi, and reads motion and magnetic-field sensors.
It's honest about the boundary: a phone can't clone secure credentials, or use 125 kHz proximity and sub-GHz radios. Fin tells you the truth instead of pretending.
Also inside
Door-lock self-audit, QR lab, reports, and a Learn library.
- Door Lock Safety Check — scores digital & physical risk with plain-English fixes.
- QR / Barcode Lab — offline scan & generate, with secret-handling warnings.
- Reports — local, redaction-aware Markdown / JSON export you control.
- Learn — eleven offline articles on what phones can and can't sense.
Install
Direct APK for your Android phone.
This is a sideload build (package tv.mayoflux.fin). Android may ask you to allow installs from your browser or file manager first.
- Download the APK on your Android phone.
- Open the downloaded file.
- Allow installs from that source if Android prompts you.
- Open Fin, accept the safety agreement, and grant permissions per tool as you go.
Reality check
Use it to learn and to harden — never to intrude.
Only test devices, tags, networks, and locks you own or are authorized to test. Fin cannot clone or emulate real access, transit, hotel, or payment credentials; the HCE feature is a labelled toy on a private AID. The hidden-device tools are awareness aids, not guaranteed detectors — weak signals are not proof of hidden electronics.
Version 0.1.1
Download Fin
Native Android security-awareness toolkit. Local-only, redaction by default.
Download APKDocumentation · Privacy · Safety
SHA-256: 3c681a80803624fac5180ee3c953c627c65077e7b04b76036bffe996aa4c7086