Specter 1.0 — NFC reader & skimmer bug-sweep

Specter turns your Flipper Zero into a pocket counter-surveillance bug-sweep for active 13.56 MHz NFC readers — a hidden card skimmer slipped into a payment terminal, a covert reader behind a door panel, a rogue logger taped under a desk.

It passively senses the RF carrier that any powered-on reader constantly emits and turns it into a live EMF-style meter with geiger clicks that speed up as you close in. It never transmits.

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📥 Install

Option A — prebuilt (easiest)

1. Download specter.fap from the Assets below.
2. Open qFlipper and drag it onto SD Card / apps / NFC /.
3. On the Flipper: Apps → NFC → Specter.

Option B — build it yourself

python3 -m pip install --upgrade ufbt
ufbt launch     # builds, uploads and opens it

✨ What's in this release

• 📟 The EMF gauge — an analog-style sweep meter whose needle rides the live FIELD %, with a peak-hold marker and a red "hot zone" at the top of the dial.
• 👻 Reader lock — the moment a reader's carrier is sensed, the screen frames in an alarm border, a throb ring pulses, and the strip flips to ● ACTIVE READER with a proximity readout (FAINT → NEAR → CLOSE → STRONG).
• 🔊 Geiger feedback — clicks that accelerate as the field strengthens, so you can sweep a surface and hear yourself getting warmer. Plus magenta LED + vibe on contact.
• 📈 Live waveform tracing the noise floor while it's quiet.
• 🎚️ Tunable sensitivity — High / Medium / Low noise floor.
• 🔌 Zero extra hardware — uses the Flipper's onboard ST25R3916 NFC chip. Nothing to flash, nothing to wire.

🔬 Scope & honest limits

• 13.56 MHz (HF/NFC) only — the band used by contactless payment skimmers and most modern access readers. It cannot see 125 kHz (LF) prox readers.
• It senses that a reader is there and roughly how close — it does not decode or capture what the reader reads.
• FIELD % is a relative warmer/colder guide, not a calibrated distance.
• A reader must be powered and polling; a dormant or shielded one may stay quiet.
• Listen-only. Use it only on hardware you own or are explicitly authorised to assess.

🛠️ Build info

Built with	ufbt — Target 7, API 87.1
CI	✅ green on both release and dev SDK channels
Size	~23 KB
License	MIT

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Full docs: README · Built by at0m-b0mb