Human Sender proves a real person wrote this message, made this call, or is on this video — not AI, not a bot, not a deepfake.
Got a code?
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Someone sent you a 4-digit or 6-character code. Type it to confirm they're a real human.
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Sign your emails and messages. Challenge anyone who contacts you. Free to get started.
Get started free →How it works
Three everyday situations
You're reaching out to someone
Sign your email or message before you send it
Generate a one-time code and add it to your email signature. The recipient clicks it and sees: "Joel personally wrote this to you at 14:32 today." No more ignored cold emails — they know you're a real person.
Hi Sarah, just a quick follow-up on...
A stranger contacts you and you're not sure who it is
Send them a challenge — they prove they're human in 5 seconds
You get a code and share it: "Go to humansender.com/c/4827 to confirm you're a real person." They open it in any browser, do a quick camera check, and you get instant confirmation. They don't need a Human Sender account.
You're on a live call and something feels off
Both of you share a code — each confirms the other is real
Each person generates a 4-digit code in their Human Sender app and reads it aloud. You both check each other's code. If they match, you're both real humans on the call right now — not a voice clone, not a recording, not AI.
You say
9412
They say
5587
Why it matters
Voice clones cost €10
30 seconds of audio from LinkedIn is enough to clone anyone's voice in real time. Human Sender proves a live human is present — not a recording.
AI writes better cold emails than humans
Inboxes now assume strangers are bots. A verified-human badge is the signal that cuts through and earns a reply.
€25M wired to a deepfaked CFO
Arup, 2024. A finance worker on a Teams call with a fake CFO. A one-sided challenge would have caught it in 10 seconds.