Dev tools · alternatives · 2026

24 alternatives to Solo

The first open source FIDO2 security key. USB & NFC

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Solo launched in 2018; newer entries below may have overtaken it.

1. 1SO
   Solo, open source FIDO2 security key▲98

   2018 · github.com · its alternatives →

2. 2
   SoloKeys▲139

   Secure login made open and easy 🔒

   2018 · its alternatives →

3. 3FU
   FIDO2 USB+NFC token optimized for security, extensibility, and style▲11

   2018 · github.com · its alternatives →

4. 4
   Solo V2 — Safety Net Against Phishing▲12

   Open security key to protect your Gmail, Twitter, GitHub, ..

   2021 · its alternatives →

5. 5
   OnlyKey DUO▲88

   Open source Yubikey alternative with dual USB-C and USB-A

   2021 · its alternatives →

6. 6
   Fido▲194

   The safest and most minimalistic smart lock

   2019 · its alternatives →

7. 7TS
   The SC4-HSM, a fully open USB hardware secure module▲137

   2016 · sc4.us · its alternatives →

8. 8
   YubiKey 5Ci▲129

   Security key with dual support for USB-C and Lightning

   2019 · its alternatives →

9. 9
   OnlyKey▲118

   OnlyKey is an open source alternative to YubiKey

   2019 · its alternatives →

10. 10SA
    SeKey: An SSH Agent for OS X, Using Secure Enclave and TouchID, in Rust▲169

    2017 · github.com · its alternatives →

11. 11KA
    Kryptonite – a new home for your SSH private key▲338

    2017 · krypt.co · its alternatives →

12. 12
    I built an encrypted BLE dongle for pasting stuff to air-gapped devices▲5

    Definitely one of those "20 minute adventure gone wrong" projects where all I wanted initially was a quick wireless rubber ducky for bitlocker keys and the like and then I kept adding stuff like AES-256..... Currently working on adding WebAuthn/FIDO support because the hardware is already there and scope creep is a lifestyle at this point. Would love feedback, especially on the security side. Repo and PCB files are fully open source.

    Jul 2026 · github.com · its alternatives →

13. 13
    YubiKey 5 NFC▲6

    Hardware authentication FIDO2 WebAuthn NFC

    2018 · its alternatives →

14. 14
    Open security key on nrf52480 with NFC▲5

    Solo 2 firmware in Rust. Contribute to solokeys/solo2 development by creating an account on GitHub.

    Apr 2026 · github.com · its alternatives →

15. 15
    Secur3▲77

    First decentralized 2FA solution for self-custodial wallets

    2022 · its alternatives →

16. 16
    Zendo▲82

    Secure Mobile Messenger using OTP Encryption (iOS/Android)

    2015 · its alternatives →

17. 17LA
    Lego – A Let's Encrypt Library and CLI in Go▲93

    2015 · github.com · its alternatives →

18. 18
    KeyMe▲126

    Copy keys. Solve lockouts.

    2014 · its alternatives →

19. 19
    KeyDisk 2▲100

    Awesome replacement to stupid key rings

    2014 · its alternatives →

20. 20
    YubiKey NEO▲102

    Hardware-based authentication

    2018 · its alternatives →

21. 21CM
    Cipher – Mobile Ethereum Web3 DApp Browser▲76

    2018 · cipherbrowser.com · its alternatives →

22. 22
    OneKey▲74

    Secure & community driven crypto wallet trusted by millions.

    2022 · its alternatives →

23. 23MA
    Monocypher: a small, easy to use crypto library▲90

    2017 · loup-vaillant.fr · its alternatives →

24. 24
    ESCapey▲84

    An ESC key solution for new Apple Laptops

    2016 · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →