Cosmic is an AI-powered headless CMS with a content API, TypeScript SDK, and built-in AI agents. See 2026 pricing, features, pros and cons.
Cosmic is a headless content management system, meaning content is managed through a dashboard and delivered to any frontend, website, app, or other channel, through an API rather than a tightly coupled templating system. It targets developers who want a flexible content backend and content teams who want an intuitive editing interface without needing developer help for every content change.
Co-founded by Carson Gibbons and Tony Spiro, with the underlying idea originating around 2014 and an early public version launching around 2016, Cosmic went through Y Combinator's W19 batch and is headquartered in San Francisco. Tony Spiro serves as CEO of the roughly eight-person team as of available reporting.
Cosmic differentiates itself from most headless CMS competitors by building AI agents directly into the platform rather than offering AI only as a writing-assist feature. Its Team Agent operates inside messaging tools like Slack, WhatsApp, or Telegram, maintaining conversation memory and triggering actions in the CMS, connected codebases, or third-party APIs based on natural-language requests.
The company also describes Content Agents that can publish and manage content and Code Agents aimed at shipping features and fixing bugs, positioning Cosmic as what it calls an agentic CMS. A Model Context Protocol (MCP) server extends this further by letting AI coding assistants such as Cursor, Claude Code, and GitHub Copilot interact directly with a project's Cosmic content.
Cosmic uses a Bucket-based pricing model, where a Bucket is a content container, combined with limits on team members and content Objects. The Free plan (0 USD) includes 1 Bucket, 2 team members, and 1,000 Objects, and requires no credit card, making it usable for small projects or evaluation.
Paid plans scale from Builder at 49 USD per month (2 Buckets, 3 members, 5,000 Objects) through Team at 299 USD per month (3 Buckets, 5 members, 20,000 Objects) to Business at 499 USD per month (5 Buckets, 10 members, 50,000 Objects), with additional team members available for 29 USD per user per month on any paid plan.
Cosmic is used as a headless CMS to manage structured content, then deliver it via API to websites, mobile apps, or other digital products, with built-in AI agents for automating content publishing and related tasks.
Yes, Cosmic offers a free forever plan with 1 Bucket, 2 team members, and up to 1,000 Objects, with no credit card required.
Paid plans start at 49 USD per month for the Builder plan (2 Buckets, 3 members, 5,000 Objects), rising to 299 USD per month for Team and 499 USD per month for Business, with additional users at 29 USD per user per month.
Yes, Cosmic provides a Model Context Protocol (MCP) server that connects its content API directly to AI coding assistants including Cursor, Claude Code, and GitHub Copilot.
Cosmic offers a Team Agent that operates from messaging tools like Slack, WhatsApp, or Telegram, plus Content Agents for publishing and managing content and Code Agents aimed at shipping features and fixing bugs.
Cosmic was co-founded by Carson Gibbons and Tony Spiro, with the concept originating around 2014 and an early public launch around 2016; the company went through Y Combinator's W19 batch and is led by CEO Tony Spiro.
Cosmic is headquartered in San Francisco, California, United States.
A Bucket is Cosmic's term for a content container, similar to a project or workspace, and the number of Buckets included is a key limit that scales across its pricing plans.