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Telecommunications · head to head

Telesign vs Whereby

Telesign logo

Telesign

Telecommunications

Phone number verification and fraud scoring rather than general purpose messaging

From
On request
Rated
-
Full reviewWebsite
Whereby logo

Whereby

Telecommunications

No downloads, no logins - just video meetings that work

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Whereby has a free tier, so it costs nothing to try first.
  • Each has a real cost: Telesign risk scoring is probabilistic, so tuning thresholds trades fraud caught against genuine users blocked, and somebody has to own that trade-off continuously.; Whereby no breakout rooms, polls, or whiteboard tools
  • They diverge on capability: Telesign covers Phone number verification, Whereby covers Browser-based meetings.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Telesign and Whereby actually diverge.

Attributes where Telesign and Whereby differ
AttributeTelesignWhereby
Starting priceOn requestFree
Pricing modelPer message and per verification, priced by destination countrysubscription
Free tierNoYes
PlatformsWeb, APIs, Java, Python, JavaScript, PHP, C#Web
FoundedUnknown2013

Identical on both: user rating (Not yet rated), category (Telecommunications).

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 Telesign

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

Only in Whereby

  • Browser-based meetings
  • No downloads required
  • Personal room URLs
  • Screen sharing
  • Recording
  • Google Calendar
  • Outlook
  • Slack

What people use each for

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

Telesign

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

Whereby

  • Client meetingsnot Telesign
  • Remote consultationsnot Telesign
  • Team standupsnot Telesign
  • Webinarsnot Telesign

Where each one falls short

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

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.

Whereby

  • No breakout rooms, polls, or whiteboard tools
  • Hard cap of 200 participants and performance drops with groups of 12+
  • No phone dial-in option for participants without internet
  • Occasional connectivity issues and laggy screen sharing reported

Pricing, plan by plan

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

Whereby

Free
  • FreeFree
    • 1 meeting room
    • 100 participants
    • Screen sharing
  • Pro$6.99/month
    • 3 meeting rooms
    • Custom branding
    • Recording
  • Business$11.99/month
    • Unlimited rooms
    • SSO
    • Analytics

Which should you pick?

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

Choose Whereby if

  • You need browser-based meetings.
  • You want to start without paying.
  • You also want no downloads required.
Whereby review

Questions people ask

Is Telesign or Whereby better?
Neither clearly leads. Telesign starts at On request and Whereby at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Telesign or Whereby?
Whereby has a free tier; the other does not. Paid plans start at On request for Telesign and Free for Whereby.
Does Telesign or Whereby run on more platforms?
Telesign runs on Web, APIs, Java, Python, JavaScript, PHP, C#. Whereby runs on Web.
Can I use Whereby for free?
Yes. Whereby has a free tier, so you can try it without paying. Telesign starts at On request.
What is Telesign best used for?
Telesign is most often used for consumer platforms blocking fake account creation at signup, fintechs and marketplaces checking sim swap history before a high value action, businesses suffering promotion and free trial abuse from disposable numbers, products needing passcode delivery optimised for completion rather than lowest cost. Of those, consumer platforms blocking fake account creation at signup and fintechs and marketplaces checking sim swap history before a high value action are not what Whereby is typically brought in for.
What can Telesign do that Whereby cannot?
Telesign covers Phone number verification, Phone number intelligence, Risk scoring, Published SMS rate card. Whereby covers Browser-based meetings, No downloads required, Personal room URLs, Screen sharing.

Answered from the vendors’ own pages

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.

Whereby: Does Whereby require software downloads?

No. Whereby is browser-based and requires no downloads or complex configuration. Participants join via a simple link without needing to install software.

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.

Whereby: What is Whereby's pricing model?

Whereby offers a free-forever plan and paid plans starting at $5.82/month when billed annually. Whereby does not offer a free trial.

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.

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