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Solo 2
Newark, Delaware, United States
What it is
Solo 2 is an open-source FIDO2 security key for adding hardware-based authentication to online accounts. It supports FIDO2, WebAuthn, and U2F, and basic use needs no software installation or drivers. A capacitive sensor confirms authentication when touched. The key works with security-key-enabled services such as Google, Microsoft, Facebook, Salesforce, GitHub, Dropbox, and Twitter/X; listed browsers include Chrome, Edge, Safari, Brave, and Firefox. Credentials and passkeys remain on the physical key rather than being backed up to cloud services, with capacity for approximately 100 passkeys. Standard Solo 2 keys ship with locked firmware and SoloKeys attestation certificates, while the Hacker model does not include attestation. The solo2-cli utility manages passkeys, firmware updates, PINs, PIV, and OpenPGP settings. Forgetting the PIN and resetting the key erases stored passkeys, and the guide recommends registering a backup key. Prices start at $34 as a one-time purchase for a USB-C model without NFC; NFC versions are listed separately.
For and against
For
- Supports FIDO2, WebAuthn, and U2F.
- Basic use requires no drivers or installation.
- Stores approximately 100 passkeys locally.
- Works with several named browsers and services.
- Open-source software, hardware, and documentation.
Against
- Resetting after a forgotten PIN erases stored passkeys.
- Standard listed models may lack NFC.
- No free plan or trial is listed.
The verdict
Solo 2 offers physical-key authentication with locally stored passkeys and broad standards support. Buyers should account for the PIN-reset data loss and choose an NFC model if that capability is needed.
Who it suits
Solo 2 suits everyday users, security professionals, and enterprise teams seeking a physical security key. The Hacker model is intended for developers, security researchers, and makers.
Plans and prices
Solo 2C Security Key
USB-C · no NFC
Read 5 Oct 2026 · solokeys.com
Solo 2 USB-A Hacker
USB-A · unlocked for custom firmware · no NFC
Read 5 Oct 2026 · solokeys.com
Solo 2 USB-A Security Key
USB-A · no NFC
Read 5 Oct 2026 · solokeys.com
Solo 2A+ NFC Security Key
USB-A · NFC
Read 5 Oct 2026 · solokeys.com
Solo 2C+ NFC Security Key
USB-C · NFC
Read 5 Oct 2026 · solokeys.com
On the record
- Attestation
- Standard Solo 2 devices ship with locked firmware and SoloKeys attestation certificates; the Hacker model does not include attestation.solokeys.com · read 5 Oct 2026
- Authentication
- It supports FIDO2, WebAuthn, and U2F; basic use requires no software installation or drivers.solokeys.com · read 5 Oct 2026
- Browser support
- The maker lists Chrome, Edge, Safari, Brave, and Firefox as supported browsers.solokeys.com · read 5 Oct 2026
- Integrations
- It works with security-key-enabled services including Google, Microsoft, Facebook, Salesforce, GitHub, Dropbox, and Twitter/X.solokeys.com · read 5 Oct 2026
- Intended users
- Solo 2 is presented for everyday users, security professionals, and enterprise teams; Solo 2 Hacker is aimed at developers, security researchers, and makers.solokeys.com · read 5 Oct 2026
- Key management
- The solo2-cli tool can manage passkeys, firmware updates, PINs, PIV, and OpenPGP settings; the Solo 2 GUI is listed as coming soon.solokeys.com · read 5 Oct 2026
- Limits
- If a user forgets the PIN, resetting the key erases stored passkeys; the guide recommends registering a backup key.solokeys.com · read 5 Oct 2026
- Open source
- The maker says Solo 2 is fully open source: software is dual licensed under Apache 2.0 and MIT, hardware under CERN-OHL-S, and documentation under CC-BY-SA 4.0.solokeys.com · read 5 Oct 2026
- Operating systems
- The maker lists Windows, macOS, Linux, Android, ChromeOS, and xBSD; Solo 2+ supports NFC authentication on compatible Android and iOS devices.solokeys.com · read 5 Oct 2026
- Passkey storage
- Solo 2 stores credentials and passkeys on the physical key, does not back them up to cloud services, and can store approximately 100 passkeys.solokeys.com · read 5 Oct 2026
- Product
- Solo 2 is an open source FIDO2 security key designed to protect online accounts from phishing, account takeover, and unauthorized access.solokeys.com · read 5 Oct 2026
- Support
- For help with a purchased device, SoloKeys directs customers to its support email or contact form.solokeys.com · read 5 Oct 2026
- Touch confirmation
- A capacitive sensor with three contact points confirms authentication when touched.solokeys.com · read 5 Oct 2026
