Optimizely CMS SaaS vs PaaS

Short answer. Optimizely sells the same CMS two ways. CMS 13, generally available since March 31, 2026, is the PaaS version. Your team runs a .NET 10 application, keeps custom code in process and applies each upgrade (Optimizely CMS 13 FAQ). CMS SaaS is versionless and upgraded by Optimizely, custom code cannot run in process, and your front end runs on Vercel, Netlify or Optimizely's front-end hosting (Optimizely CMS SaaS). PaaS suits sites that depend on server-side customization. SaaS suits teams that want to drop .NET upgrade work and build front ends. Moving from PaaS to SaaS carries your content through Optimizely Graph, but not your .NET code.

Choosing between Optimizely CMS SaaS and Optimizely DXP (PaaS) is really about the operating model you want: how you build, ship, and run content experiences, then deciding how assets flow through that stack.

CMS SaaS in a nutshell

Optimizely CMS SaaS is a managed, headless CMS: Optimizely runs the service, you focus on front-end apps. Content is delivered via Optimizely Graph, which makes omnichannel delivery straightforward. Continuous updates and cloud management are handled for you. 

Best when: you want fast, front-end-led delivery (Next.js, etc.), lower ops overhead, and clean API access to content.

CMS PaaS in a nutshell

Optimizely CMS PaaS is a full-stack managed platform (on Azure) for sites running the traditional or hybrid CMS model. You retain deeper control over server-side code and deployments, while Optimizely provides HA/scale, security posture (ISO 27001), and self-service deployment tooling. 

Best when: you need heavy server-side customization, legacy add-ons, or highly regulated workloads with fine-grained control.

Quick comparison

• Architecture

  • CMS SaaS: Headless service + Graph delivery; front-ends own rendering. 

  • DXP (PaaS): Full-stack CMS with traditional or hybrid patterns. 

• Ops & releases

  • CMS SaaS: Optimizely manages scaling and updates. 

  • DXP (PaaS): You manage application code and deploy via DXP tooling. 

• Customization

  • CMS SaaS: Extend via APIs, UI extensions, and front-end apps.

  • DXP (PaaS): Deep server-side customization possible. 

• Both are strategic
  Optimizely continues to invest in both options; pick the model that fits your constraints and roadmap.

Which option fits your site?

The answer depends on how much custom code and how many integrations your site carries, and on who maintains it. Our free Optimizely technical audit checks your custom code, integrations, hosting, the content move through Optimizely Graph and your team's skills, then recommends PaaS with CMS 13 or SaaS, with a 3-year cost view.

Leaving Sitecore for Optimizely? Our Sitecore to Optimizely migration assessment scopes, budgets and schedules the move.