Get more verified sign ups by connecting Truecaller SDK.

No hidden fees. And no cost for verifying Truecaller users.
Frictionless sign ups in 3rd party Android applications.
Ultra-lightweight so you can set up and go live quickly.

A phone number is much more than a way to connect — it’s an identity. Truecaller offers a unique tool, TrueSDK, for any app developer that wants to minimize the friction and complexity of getting new users on-board.

No more One Time Password (OTP) verification or users dropping off. TrueSDK helps end users quickly and effortlessly utilize their Truecaller credentials to sign-up with one-touch to third-party apps with their phone number.

Save your time and resources. TrueSDK will help drastically reduce costs, improve the overall quality of your community (no more spam accounts) and accelerate global user growth.


Truecaller users are passionate, active and eager to connect. Now, apps all over the world can build a thriving community based on safety, accuracy and user consent.
250 Million
3 Billion
Searchable numbers
460 Million
Spam calls identified or blocked per month
4.2 Billion
Monthly searches
"TrueSDK from Truecaller is a one touch product to offer verified phone number based sign up/login feature. For OYO Rooms, where we are mobile first and use phone number for user account creation, this really has helped us in reducing customer friction in signing up. With Truecaller's large user base, we see this feature benefitting a large number of our users."
Anurag Gaggar-VP, Products at OYO Rooms
"At CarDekho we work relentlessly on making our user's experience seamless and delightful. To deliver this, we ensure that business goals like OTP verification does not come in between user's goal of finding the right car for him/her. By integrating TrueSDK from Truecaller we have been able to realise the authentic details flawlessly without making users fill forms or enter OTP for tedious verification. This innovative solution from Truecaller is currently contributing over 25% of our user on-boarding and significantly improved our successful sign ups/form fills by over 30% while allowing us to serve users anywhere around the world"
Rahul Yadav-Director, Products, CarDekho
"By integrating Ixigo apps with TrueSDK from Truecaller we are solving many problems at one go. With Truecaller our users no longer need to go through tedious OTP(One Time Password) step to sign up or fill in information manually with the autofill option available. It is frictionless and one touch and a key enabler in enhancing our in-app user experience. Currently we see over 1/3rd of sign ups via TrueSDK and using it has grown our successful signups by over 25%"
Rajnish Kumar, Co-founder & Chief Technology Officer(CTO), Ixigo
"Our users while signing up on Mobikwik app, now have a frictionless and one step registration with their Truecaller verified phone number. We are seeing over 30% of our daily registrations coming via TrueSDK and has significantly contributed to grow our conversion rates."
Mrinal Sinha, COO, MobiKwik