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APIs · head to head

Ably vs Merge

Ably logo

Ably

APIs

Realtime data delivery platform for pub/sub messaging at scale

From
Free
Rated
-
Full reviewWebsite
Merge logo

Merge

Automation Integration

One API for all your integrations

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.; Merge cannot access data outside Merge's universal schema; no support for custom objects or deep field mappings
  • They diverge on capability: Ably covers Pub/sub messaging, Merge covers Unified API.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Ably and Merge actually diverge.

Attributes where Ably and Merge differ
AttributeAblyMerge
Pricing modelfreemiumusage-based
Platformsweb, ios, android, apiApi
CategoryAPIsAutomation Integration
FoundedUnknown2020

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 Merge

  • Unified API
  • HRIS integrations
  • Accounting integrations
  • CRM integrations
  • ATS integrations
  • Ticketing integrations
  • File storage integrations
  • Workday

What people use each for

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

Ably

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

Merge

  • Workflow Automationnot Ably
  • Data Integrationnot Ably
  • Process Automationnot Ably
  • App Integrationnot Ably
  • API Connectivitynot 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.

Merge

  • Cannot access data outside Merge's universal schema; no support for custom objects or deep field mappings
  • Merge holds customer OAuth tokens, creating vendor lock-in; switching providers requires re-authentication from all customers
  • No support for legacy systems without APIs; limited to modern SaaS applications
  • Pricing complexity at scale with multiple dimensions (workflows, tasks, connectors) affecting costs

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

Merge

Free
  • FreeFree
    • 1 linked account
    • All integrations
    • Standard support
  • Launch$650/month
    • 50 linked accounts
    • All categories
    • Email support
  • Scale$2500/month
    • Unlimited accounts
    • Priority support
    • SLA
  • Enterprise$undefined/month
    • Dedicated support
    • Custom contracts
    • Advanced security

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 Merge if

  • You need unified api.
  • You want to start without paying.
  • You work on Api.
  • You also want hris integrations.
Merge review

Questions people ask

Is Ably or Merge better?
Neither clearly leads. Ably starts at Free and Merge at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ably or Merge?
Ably starts at Free and Merge at Free.
Does Ably or Merge run on more platforms?
Ably runs on web, ios, android, api. Merge runs on 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 Merge is typically brought in for.
What can Ably do that Merge cannot?
Ably covers Pub/sub messaging, Presence, Message persistence, Multi-protocol support. Merge covers Unified API, HRIS integrations, Accounting integrations, CRM integrations.

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
Merge: What is a Linked Account in Merge?

A Linked Account represents an end customer's authenticated connection to a third-party application (like Salesforce, HubSpot, or Zendesk). Merge pricing is based on the number of production Linked Accounts your end users activate.

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
Merge: Can I access custom data not in Merge's universal schema?

No. Merge works well for standardized integrations but hits limits with enterprise customers. You cannot access data outside Merge's universal schema, cannot customize integration behavior for specific customers, and cannot pull deeply custom data from source systems.

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
Merge: What happens if I switch away from Merge?

Merge holds your customers' OAuth tokens. Switching providers means asking every customer to re-authenticate, resulting in potential customer churn and unhappy users.

Merge: Does Merge work with legacy systems?

No. Merge only works if there's an API. Legacy ERPs, government portals, insurance carriers, and older enterprise systems that customers depend on often don't have APIs, making Merge unable to support these integrations.

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