Learn why you should choose a headless CMS like Cosmic over any other
Cosmic vs. Sitefinity
Cosmic | Sitefinity | |
|---|---|---|
| Technology | API-first platform with REST API. Built-in AI agents for content creation, code generation, and automation. No proprietary query language to learn. | .NET. Microsoft SQL Server. |
| Scalability | Fully managed, globally distributed infrastructure. Scales automatically with no configuration. AI agents scale with your content needs. | Does not scale easily. Limited by servers. |
| Security | SSL everywhere. Role-based access control included on all plans. | You maintain the security yourself. |
| CMS maintenance | Fully managed platform. Zero maintenance, zero DevOps. Dashboard, media library, AI agents, and all tools hosted and updated automatically. | They deploy, host, and maintain everything for you. Along with your application and content, you need to maintain updates and security for your CMS system. |
| Global caching | Global CDN with edge caching. Automatic cache invalidation on content publish. No configuration required. | No caching included out of the box. |
| Media CDN | Built-in imgix media CDN with on-the-fly image optimization, resizing, and transformation. AI image generation included on all plans. | No CDN included out of the box. |
| Image processing | imgix-powered transformations via URL parameters. AI image generation creates original images from text descriptions directly in the CMS. | Manually manage your own image sizes and optimizations. |
| Extendability | Webhooks, API integrations, and AI agents that connect to GitHub, Slack, WhatsApp, and Telegram. Multi-agent workflows for custom automation pipelines. | Possible. Limited. Complicated. |
| Frontend | Works with any frontend framework. Official templates for Next.js, React, Astro, Vue, and more. Autopilot builds and deploys complete applications from a prompt. | Front end is coupled with backend CMS. Can be made to be Headless. |
| Number of projects | Free plan includes 1 project (bucket). Paid plans include 2 to 5 projects with additional projects available as add-ons. | One login, multiple websites. |
| Annual costs | Free forever plan. Paid plans from $49/mo (Builder) to $499/mo (Business). AI tokens included on every plan. | You will need to hire developer resources as this system is WAY complicated and outdated. Average salary of a full-stack developer is $111,600 per year. You may need to hire 1-3 developers to maintain the CMS. Plus the cost of licensing Adobe Experience Manager (AEM) can be astronomical. |
Why Teams Move from Sitefinity to Cosmic
Sitefinity from Progress Software is a .NET-based CMS that has served mid-market and enterprise marketing teams for over a decade. It offers solid personalization, multi-site management, and a familiar visual editing experience for content teams. But like most legacy .NET CMS platforms, it was designed for a different era, before headless delivery, AI agents, and multi-channel content distribution became the norm.
Cosmic is built for the way teams work in 2026: API-first content delivery, AI agents that automate the content operation, and zero server infrastructure to manage.
What Sitefinity Does Well
- Visual page editing and personalization for marketing teams
- Multi-site management from a single dashboard
- Strong .NET ecosystem integration for Microsoft-stack organizations
- Digital experience capabilities including A/B testing and audience segmentation
- Progress Software's enterprise support and services
Where Sitefinity Falls Short in 2026
Built on .NET. Sitefinity requires a Windows Server or .NET-compatible hosting environment. For organizations running JavaScript frontends with Node.js, Next.js, or React, Sitefinity introduces a technology mismatch that complicates the development workflow.
Complex to maintain. Like most .NET CMS platforms, Sitefinity requires regular updates, database management, server patching, and developer involvement for configuration changes. Headless delivery is possible but requires additional configuration.
No AI agents. Sitefinity has no built-in AI agents for content creation, code generation, or workflow automation. AI capabilities require third-party integrations.
Pricing is not transparent. Sitefinity's pricing is not publicly listed. Enterprise licensing typically involves sales conversations and custom quotes, which slows the evaluation process.
Cosmic's Approach
Cosmic delivers a modern alternative:
- REST API and TypeScript SDK that any JavaScript developer can use immediately
- AI agents that create content, write code, and run automated workflows
- Zero server infrastructure, zero .NET runtime, zero licensing complexity
- Transparent pricing with a free tier to get started
Cosmic's AI platform runs on Claude. Build and deploy full applications from a single prompt.
Feature Comparison
| Feature | Cosmic | Sitefinity |
|---|---|---|
| REST API for modern frontends | Yes | Yes (with configuration) |
| JavaScript/TypeScript SDK | Yes | No (primarily .NET) |
| AI content creation agents | Yes | No |
| Code agents (GitHub integration) | Yes | No |
| Computer use agents | Yes | No |
| Team agents (Slack, WhatsApp, Telegram) | Yes | No |
| Multi-agent workflows | Yes | No |
| Zero server infrastructure | Yes | No |
| Transparent public pricing | Yes | No |
| Free plan | Yes | No |
Pricing
Cosmic Free: 1 Bucket, 2 team members, 1,000 objects. No credit card required.
Cosmic Builder: $49/month. 2 Buckets, 3 team members, 5,000 objects.
Cosmic Team: $299/month. 3 Buckets, 5 team members, 20,000 objects, AI tokens included.
Cosmic Business: $499/month. 5 Buckets, 10 team members, 50,000 objects.
Sitefinity: Custom enterprise pricing. Not publicly listed. Typically requires a sales conversation and a multi-month evaluation process.
When to Choose Cosmic Over Sitefinity
- Your team works in JavaScript/TypeScript, not .NET
- You want AI agents that automate your content operation without custom integrations
- You need transparent, predictable pricing without a sales process to get a number
- You want zero server infrastructure and a fully managed platform
- You want to launch in days, not months
Also see: best headless CMS for React and Next.js and agent-native content infrastructure.
Cosmic's AI Platform runs on Claude. Build and deploy full applications from a single prompt, free to start.
Or book a meeting with Tony to see the agent layer in action.
Want a Comprehensive CMS Comparison?
Download our free 12-page guide comparing Cosmic, Contentful, Strapi, and Sanity. Learn about AI features, pricing, developer experience, and more.
Uptime you can depend on
Reliable infrastructure
No need to fear downtime for your content. Our service is built to auto scale through bursts of high traffic so you can focus on your content and business, we'll handle the infrastructure.
Upgrade your uptime
Get a 99.95% uptime guarantee with our Enterprise plans.
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