Remove All Doubt. Verify Every Contact.
Send and receive instant verification to stop scammer being able to impersonate you or your contacts.
Protect your emails, texts, voice and video from scammers
UnDoubt is an authentication solution which 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 in touch with via any channel. Bringing trust back to our 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 set-up, 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 using tactics like phone spoofing and voice cloning to deceive unsuspecting victims. It's essential to stay vigilant and verify identities to protect yourself.
of adults in the UK have reported receiving an AI voice cloning scam call with 40% of those targeted actually falling victim.
Voice phishing (vishing) driven by AI voice cloning has surged by 442% in the UK in 2025.
People in UK has been the victim of fraud in the last 12 months
of all crime in the UK is fraud related.
Half of these scams have an impersonation element.
UnDoubt is build 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, to protect 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 2 peer version can also be used by micro businesses who want to verify with their accountants or other critical agencies in their supply chains. 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 social engineered scams. 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
Our FAQs should help answer all your queries but if not do get in touch.
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 (one-time code via SMS/voice).
Connect you privately with people you know - you can see who’s already on the app.
Keep your account safe e.g. re-verify on device changes and help detect risks like SIM-swap.
Let you recover access if you reinstall the app or change devices.
There are 2 main activities once you have completed set-up: invite friends to download the app and to send a challenge whenever you need to verify who you are in communciation 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 speaking to the correct person 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 start building trusted relationships with confidence
Available for iOS and Android