Duo review

Duo is an identity and access management platform built around authentication and access security. The pricing page starts at $3 per user per month for Duo Essentials, with a free plan for organizations with 10 or fewer users. Annual prices are not published.

The product combines multifactor authentication (MFA), a directory, single sign-on (SSO) and identity intelligence. Organizations can use Duo as an IAM platform or have it broker access from identity sources they already use. Its phishing-resistant authentication methods are designed to work without extra hardware.

Duo’s feature set also includes passwordless authentication and, on higher tiers, tools such as risk-based authentication, session theft protection and device trust. The product description positions Agentic IAM as an extension of zero trust principles to relationships between people and AI agents. That is a broad product claim; the published pricing details do not say which plan includes it or how it is priced.

Duo’s main advantage is breadth at a relatively low published starting price. Essentials costs $3 per user per month and includes Duo Directory, phishing-resistant MFA, passwordless authentication, SSO and unlimited applications. That gives buyers a clearer starting package than a product that charges separately for each application connection.

The plan ladder also makes the added security features easy to identify:

• Duo Free: Up to 10 users, strong MFA, integrations and the free authenticator app.
• Duo Essentials: Directory, phishing-resistant MFA, passwordless authentication and SSO.
• Duo Advantage: $6 per user per month, adding Cisco Identity Intelligence, Duo Passport, session theft protection, Active Directory Defense and risk-based authentication.
• Duo Premier: $9 per user per month, adding VPN-less remote access, complete device trust and an endpoint protection check to Advantage.

Duo can also broker access from identity sources an organization already uses, which may suit teams that want to add security controls without making Duo their only identity source. The pricing details list a 30-day free trial, though they do not specify its terms.

The headline price needs context. Duo Free stops at 10 users, and paid licenses are sold in increments of 10 for organizations under 100 users. Above 100 users, licenses are sold in increments of 25. Those minimum purchase increments can mean paying for more seats than a small team needs. The pricing page lists monthly per-user prices, but annual billing prices are not published, so buyers cannot compare the stated rates with an annual commitment.

The differences between tiers matter too. Essentials includes SSO and phishing-resistant MFA, but the listed identity intelligence and risk-based authentication features appear on Advantage at $6 per user per month. Device trust and VPN-less remote access are listed on Premier at $9. Teams should check which controls they need before treating the $3 tier as a complete fit.

The Reddit threads we read discuss Apple’s iPhone Duo, not Duo’s IAM product, so they offer no relevant customer feedback about this software. The available material also does not publish a detailed feature-by-plan breakdown for every capability, including Agentic IAM. Buyers should confirm those requirements and any annual quote directly.

Duo lists four per-user monthly tiers: Free at $0, Essentials at $3, Advantage at $6 and Premier at $9. The Free plan covers up to 10 users and includes strong MFA; Essentials adds Duo Directory, phishing-resistant MFA, passwordless authentication, SSO and unlimited applications. Each paid tier adds $3 per user per month. Advantage adds identity intelligence and risk-based features; Premier adds VPN-less remote access and device trust.

A 30-day free trial is listed. Annual billing prices are not published, so we can’t compare annual savings or estimate a longer-term bill from the listed rates. License quantities can also raise the minimum purchase: organizations under 100 users buy in increments of 10, while those over 100 buy in increments of 25. The pricing information does not specify the increment at exactly 100 users. Check your required quantity before comparing Duo’s per-user rate with a competitor’s.

Duo can serve as a full IAM solution or broker access from identity sources an organization already uses. That gives buyers a choice: adopt Duo’s Directory and SSO, or keep existing identity sources and use Duo to secure access. The published information does not explain migration steps, implementation effort, export formats or how to move directory and authentication data out, so confirm those details before making Duo central to your identity setup.

Switching away may mean replacing the MFA, SSO or directory capabilities you use; which ones matter depends on your configuration. The published materials do not publish data-export or contract-exit terms. We also weren’t given Reddit posts or comments, so we can’t responsibly say what users commonly cite as a reason for leaving. Ask Duo about migration assistance, export options and license changes, and verify how your existing identity provider and applications will work during the transition.