# AuthenticID Smart ReAuth vs BIO-key PortalGuard: side-by-side comparison (2026)

[AuthenticID Smart ReAuth](https://cybersectools.com/tools/authenticid-smart-reauth) is a commercial [MFA & passwordless](https://cybersectools.com/categories/user-authentication) solution by [AuthenticID](https://cybersectools.com/companies/authenticid). [BIO-key PortalGuard](https://cybersectools.com/tools/bio-key-portalguard) is a commercial [MFA & passwordless](https://cybersectools.com/categories/user-authentication) solution by [BIO-key International](https://cybersectools.com/companies/bio-key-international). Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best MFA and Passwordless Solutions for Business](https://cybersectools.com/shortlists/best-mfa-passwordless-solutions) picks Okta Adaptive MFA, Cisco Duo Passwordless, Beyond Identity Phishing-Resistant MFA and 4 more.

## Side-by-side comparison

| | AuthenticID Smart ReAuth | BIO-key PortalGuard |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | MFA & Passwordless | MFA & Passwordless |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | Mid-Market, Enterprise |
| Company | AuthenticID | BIO-key International |
| Headquarters | – | – |

### Use cases and capabilities

| | AuthenticID Smart ReAuth | BIO-key PortalGuard |
|---|---|---|
| MFA | Yes | Yes |
| Authentication | Yes | Yes |
| SSO | – | Yes |
| Single Sign On | – | Yes |

### Core features

**AuthenticID Smart ReAuth**

10 features listed. Sign in on the page to see them.

**BIO-key PortalGuard**

8 features listed. Sign in on the page to see them.

### Integrations

**AuthenticID Smart ReAuth**

No integrations listed.

**BIO-key PortalGuard**

2 integrations listed. Sign in on the page to see them.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [AuthenticID Smart ReAuth](https://cybersectools.com/tools/authenticid-smart-reauth) fits if you are a small business.

## AuthenticID Smart ReAuth vs BIO-key PortalGuard FAQ

Common questions when comparing AuthenticID Smart ReAuth vs BIO-key PortalGuard for MFA & passwordless.

### What is the difference between AuthenticID Smart ReAuth and BIO-key PortalGuard?

**AuthenticID Smart ReAuth**: Passwordless biometric authentication using facial recognition and liveness. Built by AuthenticID.

**BIO-key PortalGuard**: Zero Trust IAM platform with MFA, SSO, passwordless auth, and SSPR. Built by BIO-key International.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes AuthenticID Smart ReAuth and BIO-key PortalGuard?

**AuthenticID Smart ReAuth** is made by AuthenticID. **BIO-key PortalGuard** is made by BIO-key International. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is AuthenticID Smart ReAuth a good alternative to BIO-key PortalGuard?

Often, yes. AuthenticID Smart ReAuth and BIO-key PortalGuard are both MFA & Passwordless products, and both cover MFA, Authentication. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [AuthenticID Smart ReAuth vs SAASPASS](https://cybersectools.com/compare/authenticid-smart-reauth-vs-saaspass)
- [AuthenticID Smart ReAuth vs Deepnet DualShield](https://cybersectools.com/compare/authenticid-smart-reauth-vs-deepnet-dualshield)
- [AuthenticID Smart ReAuth vs IDpendant Middleware](https://cybersectools.com/compare/authenticid-smart-reauth-vs-idpendant-middleware)
- [BIO-key PortalGuard vs SAASPASS](https://cybersectools.com/compare/bio-key-portalguard-vs-saaspass)
- [BIO-key PortalGuard vs Deepnet DualShield](https://cybersectools.com/compare/bio-key-portalguard-vs-deepnet-dualshield)
- [BIO-key PortalGuard vs IDpendant Middleware](https://cybersectools.com/compare/bio-key-portalguard-vs-idpendant-middleware)

## Alternatives to each

- [See all AuthenticID Smart ReAuth alternatives](https://cybersectools.com/alternatives/authenticid-smart-reauth)
- [See all BIO-key PortalGuard alternatives](https://cybersectools.com/alternatives/bio-key-portalguard)

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Source: https://cybersectools.com/compare/authenticid-smart-reauth-vs-bio-key-portalguard

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/authenticid-smart-reauth.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on AuthenticID Smart ReAuth and BIO-key PortalGuard: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md