Bengaluru: True Software Scandinavia AB, which makes the app Truecaller that lets users see who is calling them and block unwanted calls, on Thursday announced the launch of TrueSDK, a service that helps app developers use Truecaller credentials to authenticate users.

When users register themselves for services using apps, they have to submit details such as their name and phone number to authenticate themselves. Since this data is already available with Truecaller, it has opened up its platform to allow developers to access this data, and save users’ time as well.

Truecaller was founded in 2009 and has so far raised about $80 million from venture firms Sequoia Capital, Kleiner Perkins Caufield & Byers, Access Partners and others.

This new service competes with similar login authentication by social networking platforms Facebook Inc, Twitter Inc, and Google Inc.

“The next billion people who come online relate to phone number as an identity, and as apps are getting more critical, the importance of a phone number does too," said Priyam Bose, director, worldwide developer relations, Truecaller, adding that they differentiate from others with the approach of using a phone number as the primary identifier, which is optional in the other existing services.

About 100 million of Truecaller’s 200 million users are from India, and so the Sweden-based company decided to launch TrueSDK for Android, in partnership with 12 companies, including online classifieds platform Quikr, mobile wallet company Mobikwik, bus-booking platform redBus and hotel-booking platform Oyo Rooms, among others.

TrueSDK is free for developers and users to use, and the company said this service would be extended to other companies soon, and that it had no plans of monetising this.