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Technology · head to head

Auth0 vs Merge

Auth0 logo

Auth0

Technology

Secure access for everyone

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: Auth0 free tier limited to 25,000 monthly active users, requiring upgrade for growth beyond that; Merge cannot access data outside Merge's universal schema; no support for custom objects or deep field mappings
  • They diverge on capability: Auth0 covers Universal login, Merge covers Unified API.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Auth0 and Merge actually diverge.

Attributes where Auth0 and Merge differ
AttributeAuth0Merge
Pricing modelUnknownusage-based
PlatformsWeb, iOS, AndroidApi
CategoryTechnologyAutomation Integration
Founded20132020

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 Auth0

  • Universal login
  • Social login
  • Multi-factor authentication
  • Passwordless
  • User management
  • Anomaly detection
  • Extensibility
  • Machine to machine

Only in Merge

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

Both cover

  • SOC2
  • GDPR

What people use each for

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

Auth0

  • B2C authenticationnot Merge
  • B2B authenticationnot Merge
  • B2E authenticationnot Merge
  • API securitynot Merge
  • Mobile app securitynot Merge

Merge

  • Workflow Automationnot Auth0
  • Data Integrationnot Auth0
  • Process Automationnot Auth0
  • App Integrationnot Auth0
  • API Connectivitynot Auth0

Where each one falls short

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

Auth0

  • Free tier limited to 25,000 monthly active users, requiring upgrade for growth beyond that
  • Advanced features like MFA and RBAC only available on paid Essentials tier and above
  • Ownership by Okta introduces risk that independent product roadmap may change

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

Auth0

Free
  • FreeFree
    • Up to 25,000 monthly active users
    • Basic authentication
    • Email/password login
  • Essentials (B2C)$35/month
    • Unlimited MAUs beyond free tier
    • Multi-Factor Authentication
    • Role-Based Access Control
  • Professional (B2C)$240/month
    • All Essentials features
    • Advanced security
    • Custom branding

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 Auth0 if

  • You need universal login.
  • You want to start without paying.
  • You work on Web, iOS, Android.
  • You also want social login.
Auth0 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 Auth0 or Merge better?
Neither clearly leads. Auth0 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, Auth0 or Merge?
Auth0 starts at Free and Merge at Free.
Does Auth0 or Merge run on more platforms?
Auth0 runs on Web, iOS, Android. Merge runs on Api.
Can I use Auth0 for free?
Both have a free tier, so you can try either at no cost before committing.
What is Auth0 best used for?
Auth0 is most often used for b2c authentication, b2b authentication, b2e authentication, api security. Of those, b2c authentication and b2b authentication are not what Merge is typically brought in for.
What can Auth0 do that Merge cannot?
Auth0 covers Universal login, Social login, Multi-factor authentication, Passwordless. Merge covers Unified API, HRIS integrations, Accounting integrations, CRM integrations. Both handle SOC2, GDPR.

Answered from the vendors’ own pages

Auth0: How much does Auth0 cost?

Auth0 has a Free tier for up to 25,000 monthly active users (MAUs). Paid plans start at $35/month (Essentials B2C) and scale to $240/month (Professional B2C) and higher for Enterprise. Pricing scales with MAU usage.

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
Auth0: Does Auth0 include Multi-Factor Authentication?

No. MFA, RBAC (Role-Based Access Control), and premium support are not included in the free tier and require upgrading to paid Essentials plans or higher.

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
Auth0: Is Auth0 independent or part of a larger company?

Auth0 was acquired by Okta in May 2021 for $6.5 billion. It now operates as a subsidiary business unit within Okta, but maintains its own brand and operations.

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.

Auth0: Who should use Auth0 vs Okta?

Auth0 is developer-focused and serves customer identity use cases (B2C). Okta serves workforce identity (B2B) and has broader enterprise features. Auth0 now serves both markets post-acquisition but maintains its developer-friendly positioning.

Source
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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