Impersonation fraud prevention for individuals and enterprises
Confirm who you're really talking to, in seconds, before you send money, share credentials or act on an urgent request from family, friends or colleagues.
You can no longer trust what you hear or see.
AI has made impersonation cheap, fast and convincing. The most common scams today don't rely on strangers contacting you out of the blue. They rely on someone convincingly pretending to be a person you already trust.
of frauds involved some financial loss of which 3% lost £10,000 or more.
Fraud Strategy 2026-2029, UK Government
increase in AI-enabled scams between 2024 & 2025.
Fraudscape 2025, Cifas
of all crime in the UK is fraud-related.
Half Year Fraud Report 2025, UK Finance
UnDoubt lets you prove you are talking to the right person in seconds.
An attacker can clone a voice, spoof a number, and write a convincing message. They cannot produce a cryptographic signature from a device they don't physically have.
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Simple for everyone
UnDoubt is designed to be used by anyone, regardless of technical ability. If a family member can use a messaging app, they can use UnDoubt.
Proof, not signals
Traditional ways of verifying identity try to detect patterns that can easily be faked with AI. UnDoubt provides mathematical proof that a communication is genuine.
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Network effect
The more people in your circle who have UnDoubt, the more useful it becomes. Every person who sets up the app extends the verification network.
We designed UnDoubt around a simple principle: collect the minimum and protect the maximum.
Privacy first
We never share or sell your personal data, and we don't use it for advertising or let third parties access it. Your information exists to protect you, nothing else.
Minimal data captured
UnDoubt collects the minimum data needed to operate. We don't access your contacts, messages, photos, or location. Your phone number is only used for account registration and to connect you with your trusted circle.
Cryptographic base
UnDoubt uses industry-proven cryptographic standards, combined with advanced identity verification and key management techniques, to protects you against impersonation and fraud in ways that conventional encrypted communication systems do not.
Who is UnDoubt for?
Professionals & Business Owners
Verify unexpected requests from colleagues, clients or friends and family before sharing sensitive information, approving payments or granting access.
High-net-worth individuals
Protect high-value transfers by verifying who you're speaking to, even when the voice sounds exactly like someone you know.
Vulnerable relatives
Set up an elderly parent or relative with UnDoubt so they can check that an urgent call or message really comes from you, not someone pretending to be you.
Businesses
From small businesses to large enterprises, protect your people, customers and operations from deepfakes, impersonation and social engineering. Join our pilot programme.
Set it up in under 2 minutes.
Download UnDoubt for iOS or Android and follow the prompts on screen. There's no password to remember.
Build your trusted circle.
Invite your family, friends, accountant, or anyone you'd trust with money or information. Both sides need the app for verification to work.
Send & receive verification requests.
When a suspicious or high-stakes interaction happens, either party can start a verification. The other person gets a prompt on their phone and taps 'Accept' or 'Deny'. Their response is cryptographically signed by their device, so it can't be forged or replicated, and you get a clear answer in seconds.
Pricing Plans
You'll always be able to send and receive verification challenges for free.
FAQs
Can't find what you're looking for? Reach out to us anytime.
UnDoubt is a free app that protects you and the people you care about from impersonation fraud. Using cryptographic verification, it lets you instantly confirm you are genuinely speaking to someone you know and not an imposter.
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).
Connect you privately with people you know so that you can see who among your contacts is already on the app.
Let you recover access if you reinstall the app or change devices.
Your phone number is converted to an encrypted hash on your device. We never store your actual number.
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.
• Any time you are asked to send money or provide sensitive information.
• When you receive an unexpected call or message claiming to be from someone you know.
• Before clicking on a link someone sent you.
• When something just doesn’t feel right.
Download UnDoubt App now and protect your data and money from scammers
