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Technology · head to head

Auth0 vs Telesign

Auth0 logo

Auth0

Technology

Secure access for everyone

From
Free
Rated
-
Full reviewWebsite
Telesign logo

Telesign

Telecommunications

Phone number verification and fraud scoring rather than general purpose messaging

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Auth0 has a free tier, so it costs nothing to try first.
  • Each has a real cost: Auth0 free tier limited to 25,000 monthly active users, requiring upgrade for growth beyond that; Telesign risk scoring is probabilistic, so tuning thresholds trades fraud caught against genuine users blocked, and somebody has to own that trade-off continuously.
  • They diverge on capability: Auth0 covers Universal login, Telesign covers Phone number verification.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Auth0 and Telesign actually diverge.

Attributes where Auth0 and Telesign differ
AttributeAuth0Telesign
Starting priceFreeOn request
Pricing modelUnknownPer message and per verification, priced by destination country
Free tierYesNo
PlatformsWeb, iOS, AndroidWeb, APIs, Java, Python, JavaScript, PHP, C#
CategoryTechnologyTelecommunications
Founded2013Unknown

Identical on both: 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 Telesign

  • Phone number verification
  • Phone number intelligence
  • Risk scoring
  • Published SMS rate card
  • Delivery routing

What people use each for

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

Auth0

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

Telesign

  • Consumer platforms blocking fake account creation at signupnot Auth0
  • Fintechs and marketplaces checking SIM swap history before a high value actionnot Auth0
  • Businesses suffering promotion and free trial abuse from disposable numbersnot Auth0
  • Products needing passcode delivery optimised for completion rather than lowest costnot 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

Telesign

  • Risk scoring is probabilistic, so tuning thresholds trades fraud caught against genuine users blocked, and somebody has to own that trade-off continuously.
  • No voice pricing is published at all: every one of the 233 destinations in its public rate card lists voice as quote only, so voice cost cannot be modelled in advance.
  • It is a verification and risk product, so a business that also needs general purpose messaging will run a second vendor for that traffic.
  • Number intelligence quality varies by country because it depends on operator data availability, and coverage in some markets is thinner than the global claim implies.
  • The underlying carrier assets belong to its sibling companies rather than to Telesign, so network questions route back to a parent whose principal business is not developer APIs.

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

Telesign

On request
  • Telesign$undefined/month
    • SMS prices published for 233 destination countries
    • Every voice destination listed as quote only
    • Enterprise agreements normally tied to volume commitments

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 Telesign if

  • You need phone number verification.
  • You work on Web, APIs, Java, Python, JavaScript, PHP, C#.
  • You also want phone number intelligence.
Telesign review

Questions people ask

Is Auth0 or Telesign better?
Neither clearly leads. Auth0 starts at Free and Telesign at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Auth0 or Telesign?
Auth0 has a free tier; the other does not. Paid plans start at Free for Auth0 and On request for Telesign.
Does Auth0 or Telesign run on more platforms?
Auth0 runs on Web, iOS, Android. Telesign runs on Web, APIs, Java, Python, JavaScript, PHP, C#.
Can I use Auth0 for free?
Yes. Auth0 has a free tier, so you can try it without paying. Telesign starts at On request.
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 Telesign is typically brought in for.
What can Auth0 do that Telesign cannot?
Auth0 covers Universal login, Social login, Multi-factor authentication, Passwordless. Telesign covers Phone number verification, Phone number intelligence, Risk scoring, Published SMS rate card.

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
Telesign: Who owns Telesign?

Proximus, the Belgian telecommunications operator. It acquired Telesign in 2017 through its subsidiary BICS and has owned it outright since February 2021. Telesign now sits in Proximus Global alongside BICS and Route Mobile.

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
Telesign: Did Telesign go public?

No. A merger with the North Atlantic Acquisition Corporation special purpose vehicle was announced in December 2021 at around 1.3 billion dollars and terminated on 1 July 2022, so it remained within Proximus.

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
Telesign: Is Telesign a cheaper way to send one-time passcodes?

No, and that is not its purpose. It routes for verification completion and adds a risk judgement about the number. If you only need cheap message delivery, compare rate card vendors instead.

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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