solokeys/solo1
Solo 1 firmware in C observed · 2026-08-28
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
Flags: no_license
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: n/a
- age_days: 2911
- days_rel: n/a
- days_push: 1389
- n_releases_24m: 0
Adoption not part of the score
2384 stars · 290 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Solo 1 is the open-source C firmware for the Solo security key, implementing FIDO2 (CTAP2) and U2F (CTAP) over USB and NFC on an STM32L432 microcontroller. It can also run as a standalone desktop application for development without hardware, and an unlocked 'Solo for Hacker' variant allows custom firmware.
Use cases
- build custom firmware for a FIDO2 security key
- implement two-factor authentication with a hardware token
- passwordless login with WebAuthn
- test FIDO2/U2F authentication without hardware
- audit open-source security key firmware
When to choose
- you want an open-source, auditable FIDO2/U2F security key
- you want to customize or experiment with security key firmware on a NUCLEO-L432KC or Solo Hacker
- you need a desktop simulation of a FIDO2 authenticator for development
When to avoid
- you want the latest Solo 2 / Trussed-based firmware (use solokeys/solo2 instead)
- you need OpenPGP or SSH key support out of the box
- you need a maintained production firmware - this repo's latest release is from 2022
Facets
application · maturity maintenance
auth security cryptography embedded security hardware privacy embedded windows cross-platform fido2 u2f webauthn security-key firmware usb nfc passkeys two-factor-authentication hardware-token authentication linux macos
2 sources
- readme: https://github.com/solokeys/solo1 · fetched 2026-08-28 · de1f86478838
- homepage: https://solokeys.com/ · fetched 2026-08-29 · de0baa4a8989
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| solokeys/solo1 | main | 23 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem