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SPECIFICTION
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Solo 2

solokeys.com

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Spec score 7.8 #5 of 20 in Security Keys

What it is

Solo 2 is an open-source FIDO2 security key designed to protect online accounts from phishing, account takeover, and unauthorized access. It supports FIDO2, WebAuthn, and U2F, and basic use requires no software installation or drivers. A capacitive sensor with three contact points confirms authentication when touched. The physical key stores credentials and passkeys rather than backing them up to cloud services, with capacity for approximately 100 passkeys. It works with security-key-enabled services including Google, Microsoft, Facebook, Salesforce, GitHub, Dropbox, and Twitter/X. The maker lists Chrome, Edge, Safari, Brave, and Firefox as supported browsers, alongside Windows, macOS, Linux, Android, ChromeOS, and xBSD. Solo 2+ models support NFC authentication on compatible Android and iOS devices. Standard keys ship with locked firmware and SoloKeys attestation certificates; the Hacker model has no attestation. The solo2-cli tool manages passkeys, firmware updates, PINs, PIV, and OpenPGP settings. Prices start at $34, paid once purchase; NFC models cost $46 as a one-time purchase purchase.

Spec sheet

Product
Solo 2 is an open source FIDO2 security key designed to protect online accounts from phishing, account takeover, and unauthorized access.Read 5 Oct 2026 · solokeys.com
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.Read 5 Oct 2026 · solokeys.com
Integrations
It works with security-key-enabled services including Google, Microsoft, Facebook, Salesforce, GitHub, Dropbox, and Twitter/X.Read 5 Oct 2026 · solokeys.com
Support
For help with a purchased device, SoloKeys directs customers to its support email or contact form.Read 5 Oct 2026 · solokeys.com
Headquarters
Newark, Delaware, United StatesRead 28 Sep 2026 · solokeys.com
Attestation
Standard Solo 2 devices ship with locked firmware and SoloKeys attestation certificates; the Hacker model does not include attestation.Read 5 Oct 2026 · solokeys.com
Authentication
It supports FIDO2, WebAuthn, and U2F; basic use requires no software installation or drivers.Read 5 Oct 2026 · solokeys.com
Browser support
The maker lists Chrome, Edge, Safari, Brave, and Firefox as supported browsers.Read 5 Oct 2026 · solokeys.com
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.Read 5 Oct 2026 · solokeys.com
Limits
If a user forgets the PIN, resetting the key erases stored passkeys; the guide recommends registering a backup key.Read 5 Oct 2026 · solokeys.com
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.Read 5 Oct 2026 · solokeys.com
Operating systems
The maker lists Windows, macOS, Linux, Android, ChromeOS, and xBSD; Solo 2+ supports NFC authentication on compatible Android and iOS devices.Read 5 Oct 2026 · solokeys.com
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.Read 5 Oct 2026 · solokeys.com
Touch confirmation
A capacitive sensor with three contact points confirms authentication when touched.Read 5 Oct 2026 · solokeys.com

Plans and prices

Solo 2C Security Key $34, paid once One-time purchase USB-C · no NFC Read 5 Oct 2026 · solokeys.com
Solo 2 USB-A Hacker $35, paid once One-time purchase USB-A · unlocked for custom firmware · no NFC Read 5 Oct 2026 · solokeys.com
Solo 2 USB-A Security Key $35, paid once One-time purchase USB-A · no NFC Read 5 Oct 2026 · solokeys.com
Solo 2A+ NFC Security Key $46, paid once One-time purchase USB-A · NFC Read 5 Oct 2026 · solokeys.com
Solo 2C+ NFC Security Key $46, paid once One-time purchase USB-C · NFC Read 5 Oct 2026 · solokeys.com

Every Solo 2 plan and price →

Strong points and limits

Strong points

  • Supports FIDO2, WebAuthn, and U2F.
  • Basic use requires no software or drivers.
  • Stores approximately 100 passkeys on the key.
  • Open-source software, hardware, and documentation.
  • Works with five listed browsers.

Limits

  • Forgetting the PIN and resetting erases stored passkeys.
  • Solo 2 models without NFC are listed.
  • Solo 2 GUI is coming soon.
  • No free plan or free trial.

Who it suits

Solo 2 suits everyday users, security professionals, and enterprise teams seeking hardware-key authentication. The Solo 2 Hacker model is aimed at developers, security researchers, and makers.

Verdict

Solo 2 offers standards-based authentication and local passkey storage, with open-source components and multiple device variants. Register a backup key, since a reset after a forgotten PIN erases stored passkeys.

Where Specifiction places it

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