Cybersecurity · head to head
Cisco Duo vs Microsoft Sentinel
The short version
- Each has a real cost: Cisco Duo free tier limited to 10 users maximum; Microsoft Sentinel billing is driven by the volume of log data ingested per day, so cost scales with log noise rather than with users or protected assets
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Cisco Duo and Microsoft Sentinel actually diverge.
| Attribute | Cisco Duo | Microsoft Sentinel |
|---|---|---|
| Pricing model | subscription | usage-based |
| Platforms | Web | Web, Api |
| Founded | Unknown | 1975 |
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Cybersecurity).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Cisco Duo
Nothing recorded that Microsoft Sentinel does not also cover.
Only in Microsoft Sentinel
- AI-powered analytics
- Fusion detection
- UEBA
- Automated response playbooks
- Threat intelligence
- Hunting queries
- Workbooks
- Incident management
What people use each for
The jobs each tool is most often brought in to do.
Cisco Duo
- Eliminating phishing with passwordless authnot Microsoft Sentinel
- Implementing zero trust with device trustnot Microsoft Sentinel
- Protecting sessions from hijacking and theftnot Microsoft Sentinel
- Managing compliance for regulated industriesnot Microsoft Sentinel
Microsoft Sentinel
- Cloud-based security information and event management (SIEM)not Cisco Duo
- Extended detection and response (XDR) across enterprise infrastructurenot Cisco Duo
- Data ingestion and long-term security analyticsnot Cisco Duo
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Cisco Duo
- Free tier limited to 10 users maximum
- Licenses must be purchased in 10-user increments (under 100 users) or 25-user increments (100+ users)
- Pricing is per-user per-month with minimum purchase increments
Microsoft Sentinel
- Billing is driven by the volume of log data ingested per day, so cost scales with log noise rather than with users or protected assets
- Commitment tier discounts require reserving daily ingestion capacity in advance, and a tier cannot be downgraded until 31 days have passed
- Commitment tiers start at 100 GB per day, above what smaller estates ingest
- Charges for Log Analytics, Logic Apps and Machine Learning are billed separately on top of Sentinel itself
- The free allowance is only up to 5 MB per user per day for selected Microsoft 365 security logs
- Promotional commitment pricing is time limited and locks in only until a stated end date
Pricing, plan by plan
Cisco Duo
Free- FreeFree
- Multi-factor authentication (MFA)
- Seamless integrations
- Authenticator app
- Essentials$3/month
- All Free features
- Duo Directory
- Phishing-resistant MFA
- Advantage$6/month
- All Essentials features
- Identity intelligence
- Cisco Identity Intelligence (ISPM, ITDR)
- Premier$9/month
- All Advantage features
- Complete device trust
- VPN-less remote access
Microsoft Sentinel
Free- Pay-As-You-Go$2.46/day
- Per GB ingested
- 90-day retention
- First 31 days free for new workspaces
- Commitment TiersFree
- 100GB to 50TB tiers
- Up to 65% discount
- Predictable billing
- Microsoft 365 E5Free
- Free data ingestion for M365 logs
- Bundled with E5 license
Which should you pick?
Choose Microsoft Sentinel if
- You need ai-powered analytics.
- You want to start without paying.
- You work on Web, Api.
- You also want fusion detection.
Questions people ask
- Is Cisco Duo or Microsoft Sentinel better?
- Neither clearly leads. Cisco Duo starts at Free and Microsoft Sentinel at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cisco Duo or Microsoft Sentinel?
- Cisco Duo starts at Free and Microsoft Sentinel at Free.
- Does Cisco Duo or Microsoft Sentinel run on more platforms?
- Cisco Duo runs on Web. Microsoft Sentinel runs on Web, Api.
- Can I use Cisco Duo for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Cisco Duo best used for?
- Cisco Duo is most often used for eliminating phishing with passwordless auth, implementing zero trust with device trust, protecting sessions from hijacking and theft, managing compliance for regulated industries. Of those, eliminating phishing with passwordless auth and implementing zero trust with device trust are not what Microsoft Sentinel is typically brought in for.
- What can Cisco Duo do that Microsoft Sentinel cannot?
- Microsoft Sentinel covers AI-powered analytics, Fusion detection, UEBA, Automated response playbooks.
Answered from the vendors’ own pages
Cisco Duo: How much does Cisco Duo cost?
Cisco Duo Free is $0/user/month (up to 10 users). Paid plans start at $3/user/month (Essentials), $6/user/month (Advantage), and $9/user/month (Premier). Billing is per-user per-month.
SourceMicrosoft Sentinel: How is Microsoft Sentinel pricing calculated?
Microsoft Sentinel uses a pay-as-you-go usage-based model where you pay only for data ingested, stored, and consumed. Flexible commitment tiers are available to reduce total cost of ownership, with specific rates not published on the public pricing page. Source: https://www.microsoft.com/security/business/siem-and-xdr/microsoft-sentinel/
SourceCisco Duo: Is Cisco Duo free to try?
Yes, Duo Free offers multi-factor authentication and seamless integrations at $0/user/month for up to 10 users.
SourceMicrosoft Sentinel: Does Microsoft Sentinel require an Azure subscription?
Yes, Microsoft Sentinel requires a Microsoft Azure subscription to operate. Pricing is handled through Azure and varies based on data consumption and the commitment tier you select. Source: https://www.microsoft.com/security/business/siem-and-xdr/microsoft-sentinel/
SourceCisco Duo: What is the minimum purchase for Cisco Duo?
Organizations must buy licenses in 10-user increments for under 100 users, or 25-user increments for 100 or more users. Plans are modifiable at any time.
SourceCisco Duo: What does the Advantage plan add over Essentials?
Advantage ($6/user/month) adds identity intelligence, Cisco Identity Intelligence (ISPM, ITDR), Duo Passport, session theft protection, Active Directory Defense, and risk-based authentication.
SourceRelated pages
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