Remove All Doubt. Verify Every Contact.
Send and receive instant verification to stop scammers impersonating you, your family, friends, colleagues and trusted organisations
Protect your emails, texts, voice and video calls from scammers
UnDoubt is an authentication solution that offers a suite of features designed to enhance your security and streamline the verification process.
Works for individuals and organisations allowing users to verify who they are in communication with.
Enhanced Security at Your Fingertips
Real-time verification of who you are interacting with across any channel. Bringing trust back to your calls and other communications. Never again take a chance on engaging with scammers.
User-Friendly Interface for Easy Navigation
Deliberately simple and intuitive for seamless use during calls. Challenge and verify your contact's identity with just a few taps.
Quick Setup for Immediate Use
Streamlined setup, to get you up and running fast. Personalised links provide a convenient and simple way to invite your friends and family to join you.
Modern scams are increasingly sophisticated
Scammers use tactics like number spoofing, voice cloning, deepfakes and sophisticated social engineering to deceive unsuspecting victims. It's essential to stay vigilant and verify counterparties to protect yourself.
of adults in the UK have reported receiving an AI voice cloning scam call with 40% of those targeted actually being victimised.
Voice phishing (vishing) driven by AI voice cloning surged by 442% in the UK in 2025.
adults in the UK were victims of fraud in 2024
of all crime in the UK is fraud-related.
Half of these scams have an impersonation element.
UnDoubt is built from the ground up to protect you and your privacy
Privacy first
Built with privacy and simplicity in mind, UnDoubt never shares your personal information or messages.
Minimal data captured
UnDoubt captures the minimal data necessary which remains on your devices wherever possible.
Solid cryptographic base
Using industry-proven cryptographic standards, combined with advanced identity verification and key management techniques, UnDoubt protects you against impersonation and fraud in ways that conventional encrypted communication systems do not.
Super simple to set up
Download UnDoubt from your app store. The setup process takes less than two minutes.
Invite your friends and families to join you
Invite your friends and family through a personalised link. Both parties must be using the app in order to verify each other.
Issue and receive challenges
Before taking any risk based action always verify people in your personal and professional networks with confidence.
Protection against Scams for Individuals and Small Businesses
Undoubt protects any individual who is at risk of falling foul of socially engineered scams.
Vulnerable relatives
Protect your elderly and more vulnerable family members or friends by ensuring they use Undoubt to gain trust in who they are communicating with.
High net worth individuals
Always verify before making any high-value transaction even if the voice is well known to you. AI voice cloning makes it harder than ever to trust who you are speaking with.
Business directors
Our peer-to-peer version can also be used by micro businesses who want to verify with their accountants or other critical agencies in their supply chains. It is imperative to always verify before sharing sensitive information or granting privileged access to your devices.
Enterprise (Join our pilot program)
Our Enterprise version is aimed at organisations seeking to keep their customers and their own organisation safe and protected from deepfakes, voice cloning and socially engineered scams. It supports all the main modes of communication. Can be used both internally and in dealing with customers and suppliers. More about UnDoubt for enterprise
FAQs
Get in touch if you have further questions.
UnDoubt is a secure authentication app that helps you verify the identity of people and businesses you communicate with, and allows them to verify you. Using advanced cryptography, it prevents impersonation fraud by providing mathematical proof that communications are genuine.
We use your phone number as a secure, real world anchor for your account. It helps us:
Verify it’s you during signup (to send you a one time code via SMS/voice).
Connect you privately with people you know so that you can see who among your contacts is already on the app.
Keep your account safe by allowing you to re-verify on device changes and help detect risks like SIM swaps.
Let you recover access if you reinstall the app or change devices.
There are two main activities once you have completed setup: invite friends to download the app and to send a challenge whenever you need to verify who you are communicating with.
Anytime you are being asked to send money, share sensitive information or provide access to your devices you should always check that you are interacting with the correct counterparty by using UnDoubt to send a challenge to the person you believe you are speaking to.
Pricing plans
Simple and straight forward plans. You'll always be able to use it and invite your contacts for free.
Download UnDoubt now and protect yourself from scammers and secure your communication
Available for iOS and Android