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
Solo, open source FIDO2 security key▲98
Solo 1 firmware in C. Contribute to solokeys/solo1 development by creating an account on GitHub.
2018 · github.com · its alternatives →
2
SoloKeys▲139
Secure login made open and easy 🔒
2018 · solokeys.com · its alternatives →
3
FIDO2 USB+NFC token optimized for security, extensibility, and style▲11
Solo 1 firmware in C. Contribute to solokeys/solo1 development by creating an account on GitHub.
2018 · github.com · its alternatives →
4
Solo V2 — Safety Net Against Phishing▲12
Open security key to protect your Gmail, Twitter, GitHub, ..
2021 · indiegogo.com · its alternatives →
5
OnlyKey DUO▲88
Open source Yubikey alternative with dual USB-C and USB-A
2021 · onlykey.io · its alternatives →
6
A virtual Yubikey device for 2FA/WebAuthN▲166
A Virtual FIDO2 USB Device. Contribute to bulwarkid/virtual-fido development by creating an account on GitHub.
2022 · github.com · its alternatives →
7
Fido▲194
The safest and most minimalistic smart lock
2019 · indiegogo.com · its alternatives →
8
YubiKey 5Ci▲129
Security key with dual support for USB-C and Lightning
2019 · yubico.com · its alternatives →
9
FIDO U2F Security Key▲6
Strong authentication with a simple touch of a button
2016 · yubico.com · its alternatives →
10
Corbado▲571
Passkey-first authentication for developers
2024 · corbado.com · its alternatives →
11
OnlyKey▲118
OnlyKey is an open source alternative to YubiKey
2019 · onlykey.io · its alternatives →
12
TextSecure ▲68
Open Source security for mobile devices
2015 · signal.org · its alternatives →
13
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 →
14
YubiKey 5 NFC▲6
Hardware authentication FIDO2 WebAuthn NFC
2018 · yubico.com · its alternatives →
15
Simple Secure▲63
Dropbox, Google and others form open source security group.
2014 · simplysecure.org · its alternatives →
16
LogDog V2▲89
Identity theft and hacking protection
2015 · its alternatives →
17
SeKey: An SSH Agent for OS X, Using Secure Enclave and TouchID, in Rust▲169
Use Touch ID / Secure Enclave for SSH Authentication! - sekey/sekey
2017 · github.com · its alternatives →
18TS
The SC4-HSM, a fully open USB hardware secure module▲137
2016 · sc4.us · its alternatives →
19
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 →
20
Secur3▲77
First decentralized 2FA solution for self-custodial wallets
2022 · secur3.xyz · its alternatives →
21
Zendo▲82
Secure Mobile Messenger using OTP Encryption (iOS/Android)
2015 · apps.apple.com · its alternatives →
22
KeyMe▲126
Copy keys. Solve lockouts.
2014 · key.me · its alternatives →
23
KeyDisk 2▲100
Awesome replacement to stupid key rings
2014 · its alternatives →
24
Biomio Sidekick▲11
A "TouchID" and Ransomware protection USB drive
2016 · biom.io · its alternatives →

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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 →