Verify users,
without an OTP

nOTPTM is an innovative product that allows you to authenticate and verify users without any actions from their end. Available as an SDK currently for Android phones, it works much faster than the typical OTP verification. The beauty – It works without an SMS. Hence the name nOTP. Getit?


Time to think beyond OTPs

Two-Factor authentication

nOTP can help you add a layer of security to apps without adding complexity for your users


Resetting password

Instead of sending codes via email or SMS, nOTP is a hassle-free way to verify users before password resets.


Passwordless logins & authentication

Users do not have to remember passwords and can simply be verified using nOTP every time they log in.


Prevention of spam

Instant verification allows you to stop spam registrations and avoid fake users from signing on.


How it works


Customer clicks the “verify” button on the app


Exotel verification

Exotel makes an automated outbound call to the number specified in the app.


Intercept call

Exotel SDK automatically intercepts the call, disconnects it and verifies the customer.


Number verified

Exotel then pings the server that the number is verified.

Asset 1apk

Try it yourself to get started


You can try nOTP yourself (android only) by filling this form. You will receive the test package over email. Alternatively, you can sign up and our agents will reach out to you and schedule a demo.

nOTPTM advantage for your business

Device specific authentication

nOTP is built in a way to prevent cross-device authentication. Customers need to be using the same phone number on their device for authentication.

Seamless experience

This method of verification requires no action from the user’s end, making it a seamless experience

Higher success rate

nOTP has a higher success rate compared to SMS verifications since there is no scope for delivery failures

Lower Cost

nOTP costs upto 50% less than traditional verification methods. Pay only for successful verifications

nOTPTM savings calculator


Cost for OTP


Cost for nOTP


Annual savings on verifications

Disclaimer: The cost for an SMS OTP is ₹0.21

Exhaustive guide on 2 factor authentication

From SMS OTP, to OTP over call, to email OTP, to no OTP at all! We show how 2FA evolved over time.

Asia’s most innovative companies use Exotel

Chirag Patel

Exotel's API documentation and implementation process is extremely simple and easy to follow. There were no hassles in setting it up. We use other cloud telephony platforms as well but Exotel gets a big thumbs-up from us for their ease of use.

Engineering Manager, 1mg

Shashank ND

We have worked across cloud telephony players and with other vendors, but the fact is Exotel is dependable.

Co-Founder & CEO, Practo

Prateek Jain

The number masking feature has been a very worthy addition to making our customer experience even better.

Former Associate Director - Driver Experience, Olacabs

Kumar Vinod

We used to use a traditional PBX system before. But that doesn’t have the capabilities of Exotel’s IVR system. So, we decided to use Exotel for our IVR cancellation system.

Senior Manager - Operations, redBus


Exotel's automated calls have helped in increasing our service levels and reducing our costs since there is no need for any manual intervention.

Senior Manager - Operations and Strategy

Praveen Kumar

Exotel's APIs are very clearly defined. Our tech team could integrate them in no time. It’s easy to incorporate into any product.

Assistant Vice President, Quikr Services

Satish Chugh

Very supportive and understanding staff who have lived up to every expectation, and at times exceeded them too.

Senior Manager- Last Mile Design, Ekart


Get Early Access for nOTPTM

We’ll notify you as soon as we launch it

The Exotel Advantage

Why Exotel is considered as the most reliable cloud communications company in India and Southeast Asia


Superior Quality

Best success rates, voice quality and reduced latency


Scale at Ease

Grow at will, expand without worrying about infrastructure


Superior Reliability

Best in class uptimes of 99.94% including operator uptimes


Best Support

18×7 customer support via phone, email and Twitter


Simple to implement

Sign up and get started in less than 30 minutes, integrate easily using our REST APIs


Extensive Reporting

Easy to understand, detailed reports sent every day

Find out how Exotel can work for you. Set up a call.

We take away some of the biggest pain points of traditional systems like EPABX.