Updated October 13, 2026 · ShieldCue Editorial Team
Thetis vs SoloKeys Solo 2
Facts checked September 26, 2026.
What sets them apart
| Compare |  Thetis | SoloKeys Solo 2 ReviewSee alternativesSee alternatives |
|---|---|---|
| Price | $24.99 to $49.99Lower | $35 |
| Protocols | FIDO2, FIDO U2F, WebAuthn, CTAP2, TOTP, HOTP | Fido2, U2f, Piv |
| Connectors | USB a, USB c, NFCCovers more | USB a, USB c |
| Biometric unlock | YesHas it | No |
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Key differences
- Price is lower at Thetis: $24.99 to $49.99 vs $35.
- Protocols: only Thetis offers FIDO U2F, WebAuthn, CTAP2.
- Protocols: only SoloKeys Solo 2 offers U2f, Piv.
- Connectors: only Thetis offers NFC.
- Biometric unlock: only Thetis.
- Support channels: only SoloKeys Solo 2 offers Community.
Our verdict on each
Thetis
Thetis ties account safety to a small aluminum key you plug in or tap, which removes passwords but means the device must stay with you. The brand covers shoppers, employees and developers who want phishing resistant passkey logins across hundreds of supported email, shopping and work services.
SoloKeys Solo 2
The SoloKeys Solo is an open source hardware security key for readers who want an inspectable budget token at a single device price. You pay $35 for the key, and the open source build plus PIV support sets it apart from closed rivals such as the Google Titan Security Key.
Score breakdown
| Area | Thetis | SoloKeys Solo 2 |
|---|---|---|
| Cost | Not confirmed | 9.0Entry price $35 sits above the €30.69 site median, and there is no free plan to try first. |
| Offer | 9.1Higher | 8.6 |
| Privacy | 8.5 | Not confirmed |
Side by side, item by item
| Protocols | Thetis | SoloKeys Solo 2 |
|---|---|---|
| Fido2 | Yes | Yes |
| U2f | No | Yes |
| Piv | No | Yes |
| Connectors | Thetis | SoloKeys Solo 2 |
|---|---|---|
| USB a | Yes | Yes |
| USB c | Yes | Yes |
| NFC | Yes | No |
Positions in our rankings
| Ranking | Thetis | SoloKeys Solo 2 |
|---|---|---|
| Hardware security keys | 12 of 18 | 6 of 18 |
Every fact side by side
| Fact | Thetis | SoloKeys Solo 2 |
|---|---|---|
| Pricing model | Budget | Budget |
| Legal entity | Razzo Tech Corporation | SoloKeys |
| Headquarters | United States | United States |
| Founded | 2014 | Not confirmed |
| Support channels | Email, Help centre | Email, Help centre, CommunityCovers more |
Privacy tools
| Fact | Thetis | SoloKeys Solo 2 |
|---|---|---|
| Price from | Not confirmed | $35 |
| Free plan | Not confirmed | No |
| Platforms | Windows, MacOS, Linux, iOS, Android, Chrome | Windows, MacOS, Linux, Android, ChromeOS, iOS, XBSD |
| Logging policy | Not confirmed | Credentials and passkeys are stored only on the device; no credential, FIDO2 private key, PIN or biometric data is ever collected, and no authentication data is used for analytics. |
| Jurisdiction | US | US |
| Open source | Not confirmed | Yes |
Where each stands against the rest
| Fact | Thetis | SoloKeys Solo 2 | Median |
|---|---|---|---|
| Price | $24.99 to $49.99lowest quarter | $35highest quarter | $30 |
Median across 6 listed providers.
Pros and cons
Thetis
Pros
- Pro Series combines USB A, USB C and NFC in one key
- Fingerprint option adds biometric touch to FIDO2 passkey logins
- Durable aluminum casing resists drops, bumps and scratches daily
Cons
- Protection depends on carrying and connecting a physical key device
- Coverage applies only to online services that support FIDO standards
- Narrow catalog focuses on authentication hardware rather than wider tools
SoloKeys Solo 2
Pros
- Open source is a yes, so the hardware design and firmware of the Solo can be reviewed by anyone.
- Protocol support covers fido2, u2f and piv, so the same token handles modern web sign-in, legacy sites and PIV workplace logins.
- Connectors are usb a and usb c, covering the port shapes found on current desktops and laptops.
Cons
- Biometric unlock is a no, so unlocking rests on a PIN typed on the key rather than a fingerprint check.
- Support runs on email, help centre and community, with no phone line or live chat listed for a stuck setup.
- There is no free plan, and at $35 the Solo sits in the budget class, so a light user still pays the full device price.
Who each suits
Thetis
Who it suits
- Shoppers securing email, shopping and financial accounts
- Business teams replacing passwords with phishing resistant logins
- Developers protecting repositories and smart contracts
Who should look elsewhere
- People seeking software only protection without hardware
SoloKeys Solo 2
Who it suits
- Readers who want open source hardware they can inspect before buying.
- People who want the same key on desktop and phone, given support for Windows, macOS and Linux.
- Anyone happy to unlock with a PIN instead of a fingerprint, since biometric unlock is a no.
Who should look elsewhere
- Google Titan Security Key, if you want a fingerprint unlock, because biometric unlock is a no here.
- Thetis, if the $24.99 to $49.99 range fits your budget better for a spare key at a desk.
- Token2, if you want to weigh a lower entry point, where prices run €7 to €37.
Questions about each
Thetis
What does Thetis sell?+
Thetis sells physical FIDO2 security keys that enable passwordless and phishing resistant logins. The devices plug into computers or tap by contactless connection for authentication. They help secure everyday logins with unique cryptographic keys instead of passwords.
What product ranges does Thetis offer?+
Thetis offers standard FIDO2 keys, contactless keys and fingerprint BioFP models for passkey use. The Pro Series combines USB A, USB C and NFC in one device. The range supports individual, business and developer authentication needs.
SoloKeys Solo 2
How much does the SoloKeys Solo cost?+
The Solo is a hardware key sold at $35, and the entry price is listed as $35. That figure covers the device itself, so there is no subscription to renew and no second bill later. Budget for the key, then buy a spare if you want a token waiting at another desk.
Is there a free version or trial of the SoloKeys Solo?+
There is no free plan, so a key has to be bought to get started. The Solo is listed as budget here, which is the budget class rather than a premium tier. It is a straightforward token rather than a service, so there is nothing to remember or cancel later either.