RfidResearchGroup/ChameleonUltra
The new generation chameleon based on NRF52840 makes the performance of card emulation more stable. And gave the chameleon the ability to read, write, and decrypt cards. observed · 2026-08-28
Health v2 · maintenance only
84/100
- Activity 97
- Release rhythm 59
- Longevity 96
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 304
- age_days: 1350
- days_rel: 60
- days_push: 23
- n_releases_24m: 2
Adoption not part of the score
2949 stars · 433 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
ChameleonUltra is the open-source firmware for an RFID/NFC card emulation device based on the NRF52840, capable of reading, writing, decrypting, and simulating cards like Mifare and NTAG. It is controlled via a CLI and companion GUI apps over BLE.
Use cases
- emulate mifare classic cards
- clone rfid access cards
- read and decrypt nfc tags
- simulate 125khz and 13.56mhz cards
- test nfc readers with card emulation
- analyze iso14443a card communication
When to choose
- you own a Chameleon Ultra device and need firmware or client tooling
- you need a programmable RFID/NFC card emulator for security research
- you want to clone or emulate Mifare, NTAG, or 125kHz credentials
When to avoid
- you need software-only NFC emulation without dedicated hardware
- you want a general-purpose SDR or smart-card tool outside RFID/NFC
- you need a turnkey commercial product rather than a research device
Facets
application · maturity active
security cli developer-tools security hardware reverse-engineering embedded cross-platform cli rfid nfc mifare card-emulation firmware nrf52840 125khz iso14443a
1 source
- readme: https://github.com/RfidResearchGroup/ChameleonUltra · fetched 2026-08-28 · a0b7dbe26e52
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| RfidResearchGroup/ChameleonUltra | main | 84 |
For agents
markdown · JSON · MCP: product_card(name="RfidResearchGroup/ChameleonUltra")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem