Headless CMS deep dive: How do Contentstack and Contentful compare on content delivery, multi-site management and localization?

With the Salesforce acquisition of Contentful repositioning the tool into a machine-readable content layer for Agentforce, Contentful customers and prospects may understandably have questions. At the top of the list: Who decides your CMS roadmap once it ships inside Agentforce?

Since we’re offering price matching and free migration and post-launch support for anyone looking to make the shift from Contentful to Contentstack by April 30th, 2027, it feels like a great time to be putting the two solutions under the microscope, to understand the features within each headless CMS in more detail. 

Migrating after April 2027? Get a jump start with our 10-minute content and code walkthrough.

Content delivery: Speed and reliability at scale

Contentful offers a developer-friendly delivery layer, with a well-established API-first architecture (REST, GraphQL, CLI, SDKs) that powers a large enterprise install base. Its decoupled model means the frontend keeps running even if something goes wrong at the back end.

However, look a little closer at the operational edges and the friction shows up on the write side. Reads served from Contentful’s CDN hold up well, but its Content Management API enforces request limits, so migrations, bulk imports and syncs between environments need to be throttled and batched, and multi-environment set-ups are usually where teams hit those caps first.

It’s also worth mentioning that Contentful has no built-in local development or offline/mock API workflow, so testing and CI/CD pipelines require more custom tooling. Native versioning or rollback across environments is limited, which means if you publish a change and it turns out to be incorrect, it’s harder to revert to what you had before, especially between test and production. This pushes teams toward external tools to safely manage staging-to-production publishing.

Both platforms serve content from a global CDN, so the real difference shows up when content is going in rather than coming out. Contentstack’s bulk import, publishing and environment tooling is built for high-volume write operations, so migrations and large syncs don’t have to be engineered around request caps. 

Where Contentful's versioning and rollback are limited, Contentstack's Release Management gives teams configurable workflows, audit logs and multi-environment release packaging out of the box, which means promoting content from staging to production comes with a built-in safety net. 

Morningstar's experience shows what these differences look like under real load. The team needed to migrate a high volume of legacy content in bulk, exactly the kind of write-heavy batch operation that runs into management API limits on platforms like Contentful. The structural fit of Contentstack's API-in, API-out architecture meant it was handled cleanly, with no need to build throttling logic around it, such as code to slow down, space out or batch API requests. 

The benefits carried through to production, with render times coming in five times faster than their legacy CMS. As Principal Architect Clay Gregory put it: "One person can go into a single UI and select the securities they want, enrich that with input from different systems, hit publish, and it's live within a matter of minutes. That's revolutionized how we deliver that content to users." 

Multi-site management: Managing content across a growing portfolio

Contentful can absolutely support a multi-site setup, and plenty of large organizations run one on it, but the cost of getting there climbs with every brand and market you add. Shared content across a portfolio of sites has to be linked manually via references and arrays, which is fine for one site, but harder to keep tidy when an organization is dealing with dozens. 

Contentful can clone a new environment from an existing one, but because it prices by space and environment, every new brand or market adds to the bill, and growing past a space’s environment cap means paying for another space altogether. The same write limits that slow migrations tend to compound as a site portfolio grows and environments multiply. 

Contentstack takes a more structural approach to the same problem. Environments aren’t capped, so spinning up development, testing, staging and production for a new site or market doesn’t mean hitting a plan limit or adding a new line to the invoice, and it can be done in minutes.

Modular blocks let a single component, whether that’s a hero banner, a product card or a navigation structure get modeled once and reused across pages, brands and campaigns, so a portfolio of sites shares a content backbone instead of maintaining (and paying for) parallel content models for each one. 

Roles, permissions, and workflows apply in a standardized way across every stack, brand and region, which keeps a growing site portfolio governable without a central team manually reviewing everything before it goes live.

Pirelli is the clearest example of this at scale. The team migrated 218 websites across 150 regions in 10 months, using a master template across all business unit sites and modular blocks to cut down the number of content types and stacks needed. 

As Digital CX Manager Viola Viganotti described it, launching a new product means updating "the catalog, homepages, SEO pages and product pages of 50 websites in more than 25 languages and with a very short time to market." 

This is the kind of coordinated, portfolio-wide update that gets harder and more expensive without that shared underlying structure to rely on. With Contentstack, Pirelli saw 55% increased editing efficiency in comparison to its previous solution, and the operating time has been cut in half. 

Localization: Translation and publishing across markets

Both Contentful and Contentstack localize content field by field. Both let you set fallback languages, connect translation providers like Smartling and XTM, and translate with AI from inside the editor. 

On Contentful’s Premium plan, teams also get localized workflows that assign a translator to each language, and locale-based publishing. So the real question isn’t who supports localization, because the answer would be both. Instead, it’s about how each platform treats a language once it’s been added.

In Contentful, every language lives inside one entry. The German headline sits in the same record as the English one. That keeps small sites tidy, but it ties your markets together. Version snapshots capture the whole entry, every language at once. Letting one market publish on its own schedule takes locale-based publishing, which is a Premium feature, while Contentful’s Lite plan includes three locales only.

By contrast, Contentstack treats each language as its own localized entry. It inherits from the main language until a team changes it. From then on, it has its own version history and its own publish status. France can go live today while Japan waits on legal review. A market can roll back its own copy without touching anyone else’s. Publish rules and roles can be set by language, so a regional team only edits and publishes what it owns.

The same control reaches inside components and Contentstack lets you lock individual fields inside groups and modular blocks to the master language. A product card can keep one image and SKU across every market while its headline and price change locally.

AI translation is built in too. Polaris translates an entry into several languages within one request. Brand Kit can hold a voice profile for each market, so copy sounds local, not just translated. A great example is Golfbreaks, who uses this feature to say “golf buggy” in one market and “golf cart” in another. A workflow stage change can also trigger an agent that drafts each translation for review.

Burberry’s use case spotlights what this difference looks like in production. Operating across 11 languages when they moved CMS, Burberry cut translation work by 80% by using Contentstack, and increased the number of languages they can publish to 50. By putting in native platform workflows, developer tickets dropped from 40 per week to almost zero. 

As Digital Commerce Content Manager Sonia Latoracca put it: "The integration with our translation and media systems means content can be created and published much quicker than before. The flexible, reusable components allow us to complete new design briefs without the need for constant development." 

Bringing it all together for a strong Agentic Experience Platform

While Contentful gives teams a solid and developer-trusted foundation, it leaves the operational layer around it, including environment management, versioning and translation workflows for teams to build on their own. 

Contentstack closes those gaps with native tooling across the areas that matter most; uncapped environments without per-space costs and bulk tooling built for high-volume content operations on the delivery side, portfolio-wide governance and modular blocks for multi-site environments, and languages treated as their own localized entries. 

Now that Contentful sits within the Salesforce suite, these differences matter more than ever. Even for Agentforce customers, a multi-year integration project is ahead, and for other Contentful customers, the composable, vendor-neutral use case you signed up for is no longer on the table. 

The content, data and AI layers Salesforce is promising to eventually connect are already unified in Contentstack's AXP today, running in production and creating hyper-personalized experiences at scale for customers like Burberry, Morningstar and Pirelli, not scheduled for a future release.

Reach out here to discuss a potential migration from Contentful to Contentstack.