Softwr

APIs · head to head

Ably vs Contentful

Ably logo

Ably

APIs

Realtime data delivery platform for pub/sub messaging at scale

From
Free
Rated
-
Full reviewWebsite
Contentful logo

Contentful

E-Commerce

The content platform for the digital-first era

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Ably standard and Pro plans layer usage-based charges for messages, connection minutes, and data transfer on top of the base subscription, adding cost complexity.; Contentful pricing model with content type limits (48) forces full tier upgrades
  • They diverge on capability: Ably covers Pub/sub messaging, Contentful covers Content modeling.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Ably and Contentful actually diverge.

Attributes where Ably and Contentful differ
AttributeAblyContentful
Pricing modelfreemiumUnknown
Platformsweb, ios, android, apiWeb, API
CategoryAPIsE-Commerce
FoundedUnknown2013

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Ably

  • Pub/sub messaging
  • Presence
  • Message persistence
  • Multi-protocol support
  • Encryption
  • Datadog integration

Only in Contentful

  • Content modeling
  • RESTful APIs
  • GraphQL API
  • Webhooks
  • Rich text editor
  • Asset management
  • Multi-language support
  • Version control

What people use each for

The jobs each tool is most often brought in to do.

Ably

  • Building realtime chat or collaborative appsnot Contentful
  • Delivering live data feeds like stock prices or sports scoresnot Contentful
  • Broadcasting notifications to many concurrent clientsnot Contentful
  • Running mission-critical realtime infrastructure with high uptime SLAsnot Contentful

Contentful

  • Website content managementnot Ably
  • Mobile app contentnot Ably
  • E-commerce catalogsnot Ably
  • Multi-channel publishingnot Ably
  • Digital experiencesnot Ably

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Ably

  • Standard and Pro plans layer usage-based charges for messages, connection minutes, and data transfer on top of the base subscription, adding cost complexity.
  • The jump from Standard ($29/month) to Pro ($399/month) is steep for teams needing more than 10k connections but not full Pro capacity.
  • 24/7 mission-critical support and 99.999% uptime SLAs are reserved for the custom-priced Enterprise tier.

Contentful

  • Pricing model with content type limits (48) forces full tier upgrades
  • Limited GraphQL mutations for content management complexity
  • Requires significant technical expertise and developer dependency
  • Uncertainty following Salesforce acquisition announcement in June 2026

Pricing, plan by plan

Ably

Free
  • FreeFree
    • 200 concurrent connections
    • 500 messages/second
    • 6M messages/month
  • Standard$29/month
    • 10k concurrent channels
    • 10k concurrent connections
    • 2.5k messages/second
  • Pro$399/month
    • 50k concurrent channels
    • 50k concurrent connections
    • 10k messages/second

Contentful

Free
  • FreeFree
    • 10 users
    • 100K API calls per month
    • 1 Space
  • Team$489/month
    • Higher usage limits
    • Additional collaboration features
    • Professional support

Which should you pick?

Choose Ably if

  • You need pub/sub messaging.
  • You want to start without paying.
  • You work on web, ios, android, api.
  • You also want presence.
Ably review

Choose Contentful if

  • You need content modeling.
  • You want to start without paying.
  • You work on Web, API.
  • You also want restful apis.
Contentful review

Questions people ask

Is Ably or Contentful better?
Neither clearly leads. Ably starts at Free and Contentful at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ably or Contentful?
Ably starts at Free and Contentful at Free.
Does Ably or Contentful run on more platforms?
Ably runs on web, ios, android, api. Contentful runs on Web, API.
Can I use Ably for free?
Both have a free tier, so you can try either at no cost before committing.
What is Ably best used for?
Ably is most often used for building realtime chat or collaborative apps, delivering live data feeds like stock prices or sports scores, broadcasting notifications to many concurrent clients, running mission-critical realtime infrastructure with high uptime slas. Of those, building realtime chat or collaborative apps and delivering live data feeds like stock prices or sports scores are not what Contentful is typically brought in for.
What can Ably do that Contentful cannot?
Ably covers Pub/sub messaging, Presence, Message persistence, Multi-protocol support. Contentful covers Content modeling, RESTful APIs, GraphQL API, Webhooks.

Answered from the vendors’ own pages

Ably: What does Ably cost?

Ably offers a free plan with 200 concurrent connections, a Standard plan at $29/month plus usage, a Pro plan at $399/month plus usage, and custom Enterprise pricing with unlimited channels and connections.

Source
Contentful: Does Contentful offer a free tier?

Yes, Contentful has a Free tier with 10 users, 100K API calls per month, and support for 1 Space. This is suitable for small projects and proof-of-concept work.

Source
Ably: Is there a free plan, and what are its limits?

Yes, the free plan includes 200 concurrent connections, 500 messages per second, and 6 million messages per month with community and best-effort email support.

Source
Contentful: What is the difference between Contentful and traditional CMS platforms?

Contentful is a headless CMS that decouples content from presentation, allowing you to deliver the same content across websites, mobile apps, IoT devices, and voice assistants without duplication.

Source
Ably: How is usage metered?

Beyond plan limits, Ably charges usage-based rates of $2.50 per million messages, $1.00 per million connection minutes, $1.00 per million channel minutes, and $0.25 per GiB of data transfer, with volume discounts available.

Source
Contentful: How does Contentful handle multi-locale content?

Contentful supports multi-locale content, though multi-locale costs must be negotiated upfront depending on your pricing tier and requirements.

Source
Contentful: Does Contentful integrate with e-commerce platforms?

Yes, Contentful partners with Commerce Layer, an API-first commerce platform, to enable enterprise-grade e-commerce experiences alongside headless CMS capabilities.

Source
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