corax
Contact exchange by tap, bump, or chirp — the person receiving needs nothing. Not even this app.
Three ways a card moves
Tap live now
Any $0.30 NFC tag becomes your card. Write it from your own phone; iPhones and Androids read it with the screen on — nothing to install, nothing to brick.
Chirp in build · M2
Your phone sings a one-second ultrasonic burst carrying a single-use token. Any phone in earshot on the exchange screen catches it — one to one, or one to a whole room.
Bump in build · M3
Knock phones together. Each device feels the same spike at the same instant; the server pairs the two motion envelopes and swaps cards in under two seconds.
Templates
A card to suit every trade — 8 templates free forever, 8 more with Pro.
- Raven
- Bone
- Ledger
- Dusk
- Moss
- Tide
- Ember
- Slate
- AuroraPro
- NocturnePro
- VelvetPro
- SunbreakPro
- OrchardPro
- DriftPro
- AtelierPro
- MeridianPro
Free
- One card, forever
- Tap, QR, and chirp exchange
- 8 templates
- 7-day analytics
Pro coming soon
- 8 gradient templates
- Badge removal — your card, only yours
- Everything in Free
Your card takes two minutes.
Free for your first card. The person receiving needs nothing — not even this app.
Make your cardBuild log
- shippedT-001 — Scaffold · CI · agent constitution
- shippedT-004 — Schema + RLS + resolve RPCs (applied)
- shippedT-005 — Magic-link auth
- shippedT-006 — Public card + vCard (/u/handle)
- shippedT-008 — Token resolve (/x/token)
- shippedT-030 — Theme presets (8, light/dark)
- shippedT-009 — QR on card + offline via SW
- shippedT-010 — PWA baseline (installable)
- shippedT-013 — Analytics dashboard (7-day)
- shippedT-014 — Chirp TX (ggwave, golden-tested)
- shippedT-015 — Chirp RX (worklet, 96.7% loopback)
- shippedT-016 — Exchange screen (chirp send/receive)
- shippedT-017 — Chirp rig: scripted + fixture doc
- nextT-011 — Device pass: tag write + first chirp heard