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YubiKey 5 NFC vs Feitian BioPass vs SoloKeys Solo 2 — Which Security Key?
Three of the best FIDO2 security keys compared side-by-side. We evaluate protocol support, resident key capacity, NFC, biometrics, open source credentials, and developer ecosystem.
Specs Comparison
| Feature | YubiKey 5 NFC | Feitian BioPass K26 | SoloKeys Solo 2 |
|---|---|---|---|
| FIDO2 / CTAP2 | Yes | Yes | Yes |
| U2F (CTAP1) | Yes | Yes | Yes |
| PIV (Smart Card) | Yes — PIV + YubiKey PIV Tool | No | No |
| OpenPGP | Yes — GPG key storage | No | No |
| OATH-HOTP/TOTP | Yes (32 slots) | No | No |
| Biometric (Fingerprint) | No (tap only) | Yes — built-in sensor | No (tap only) |
| NFC | Yes | Yes | Yes |
| Resident Key Capacity | 25 | 50+ | ~100 |
| Open Source | No (proprietary) | No | Yes — firmware + hardware |
| USB Connector | USB-A | USB-A | USB-A (USB-C available) |
| Price | ~$55 | ~$45 | ~$45 |
Which One for You?
Choose YubiKey 5 NFC if you need maximum protocol support
The only key with PIV, OpenPGP, and OATH. If you use your security key as a smart card for SSH/email encryption in addition to WebAuthn, YubiKey is the only option. 25 resident keys is enough for most users.
YubiKey 5 NFC (~$55) — FIDO2 + PIV + OpenPGP + OATH. The developer's default choice.
Choose Feitian BioPass if you want biometric + NFC at a lower price
The BioPass is the best value biometric key. The fingerprint sensor means you never need to type a PIN — tap and verify with your finger. 50+ resident key capacity. Great for users who want biometric convenience without paying YubiKey Bio prices.
Feitian BioPass K49 Pro (~$45) — FIDO2 with fingerprint sensor + NFC. Best value biometric key.
Choose SoloKeys Solo 2 if open source matters to you
The entire firmware is auditable Rust code on an nRF52840. Largest resident key capacity (~100). If you're a security researcher, privacy advocate, or just want verifiable hardware, this is the key. The developer community is excellent.
Related
Best Security Keys — Full buyer's guide | FIDO2 CBOR Attestation Parser — Decode key attestation | FIDO2 & CTAP Protocol Guide