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Auth0 vs Keil MDK

Auth0 logo

Auth0

Technology

Secure access for everyone

From
Free
Free plan
Yes
Full reviewWebsite
Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
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; Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Auth0 and Keil MDK actually diverge.

Attributes where Auth0 and Keil MDK differ
AttributeAuth0Keil MDK
Pricing modelUnknownfreemium
PlatformsWeb, iOS, AndroidWeb
CategoryTechnologyDeveloper Tools
Founded2013Unknown

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 Keil MDK

Nothing recorded that Auth0 does not also cover.

What people use each for

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

Auth0

  • B2C authenticationnot Keil MDK
  • B2B authenticationnot Keil MDK
  • B2E authenticationnot Keil MDK
  • API securitynot Keil MDK
  • Mobile app securitynot Keil MDK

Keil MDK

  • Embedded software developmentnot Auth0
  • ARM microcontroller programmingnot Auth0
  • Professional development environmentsnot 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

Keil MDK

  • Pricing for Essential and Professional subscriptions not disclosed on primary site
  • Customers must contact Arm Developer Tools store for subscription rates

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

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

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 Keil MDK if

  • You want to start without paying.
Keil MDK review

Questions people ask

Is Auth0 or Keil MDK better?
Neither clearly leads. Auth0 starts at Free and Keil MDK at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Auth0 or Keil MDK?
Auth0 starts at Free and Keil MDK at Free.
Does Auth0 or Keil MDK run on more platforms?
Auth0 runs on Web, iOS, Android. Keil MDK runs on Web.
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 Keil MDK is typically brought in for.
What can Auth0 do that Keil MDK cannot?
Auth0 covers Universal login, Social login, Multi-factor authentication, Passwordless.

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
Keil MDK: Does Keil MDK have a free version?

Yes, Keil MDK Community Edition is free for non-commercial projects. Essential and Professional editions are available as monthly or annual subscriptions.

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
Keil MDK: How much do Keil MDK paid editions cost?

Specific pricing for Essential and Professional editions is not published on the main site. Rates are available from the Arm Developer Tools store or by contacting Arm sales.

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
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
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