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APIs · head to head

Ably vs Apidog

Ably logo

Ably

APIs

Realtime data delivery platform for pub/sub messaging at scale

From
Free
Rated
-
Full reviewWebsite
Apidog logo

Apidog

APIs

All-in-one platform for API design, documentation, testing, and mocking

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.; Apidog free plan is capped at 4 users, limiting larger teams from using it at no cost.
  • They diverge on capability: Ably covers Pub/sub messaging, Apidog covers API design and documentation.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Ably and Apidog actually diverge.

Attributes where Ably and Apidog differ
AttributeAblyApidog
Platformsweb, ios, android, apiweb, windows, mac, linux

Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), user rating (Not yet rated), category (APIs).

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 Apidog

  • API design and documentation
  • Mock servers
  • Automated testing
  • Team collaboration
  • Scheduled imports
  • Branded documentation

What people use each for

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

Ably

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

Apidog

  • Designing and documenting APIs in a shared team workspacenot Ably
  • Mocking API responses for frontend development before backend is readynot Ably
  • Running automated API test suitesnot Ably
  • Replacing separate Postman, Swagger, and mock-server tools with one platformnot 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.

Apidog

  • Free plan is capped at 4 users, limiting larger teams from using it at no cost.
  • Faster scheduled imports and unlimited projects require the Professional tier or higher.
  • Smaller community and plugin ecosystem compared to long-established tools like Postman.
  • Advanced enterprise security controls require the top-tier Enterprise plan.

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

Apidog

Free
  • FreeFree
    • Up to 4 users
    • Core design, mock, and testing features
  • Basic$9/month
    • Per-seat pricing billed annually
    • Expanded team collaboration
  • Professional$18/month
    • Unlimited projects
    • Team-level shared variables
    • Faster scheduled imports
  • Enterprise$27/month
    • Advanced admin and security controls
    • Priority 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 Apidog if

  • You need api design and documentation.
  • You want to start without paying.
  • You work on web, windows, mac, linux.
  • You also want mock servers.
Apidog review

Questions people ask

Is Ably or Apidog better?
Neither clearly leads. Ably starts at Free and Apidog at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ably or Apidog?
Ably starts at Free and Apidog at Free.
Does Ably or Apidog run on more platforms?
Ably runs on web, ios, android, api. Apidog runs on web, windows, mac, linux.
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 Apidog is typically brought in for.
What can Ably do that Apidog cannot?
Ably covers Pub/sub messaging, Presence, Message persistence, Multi-protocol support. Apidog covers API design and documentation, Mock servers, Automated testing, Team collaboration.

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
Apidog: What does Apidog cost?

Apidog offers a free plan for up to 4 users, with paid per-seat plans at roughly $9/month for Basic, $18/month for Professional, and $27/month for Enterprise when billed annually.

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

The free plan supports up to 4 users with access to core design, documentation, mocking, and testing features.

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
Apidog: Can I try paid plans before subscribing?

Paid plans include a 14-day free trial, giving teams full access to premium features before committing to a subscription.

Source
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