Play a Sign tone
Phones Respond Instantly

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How it works

Three steps.
Zero friction.

01
Organizer plays a Signtone

An encoded audio signal from any speaker — laptop, PA, Bluetooth, or broadcast radio.

02
User app detects the Signtone

The Signtone app detects signtones in seconds without recording any surrounding audio.

03
One tap to register

Name and email captured instantly.

Signtone detectednow
Tech Summit 2026
Austin Convention Center
Confirm Registration
Use cases

One technology.
Endless applications.

🎫
Frictionless entry

Signtone plays at the entrance. Attendees check in as they walk in. No desk, no queue.

📋
Rich profile capture

Name, email, company, and LinkedIn — captured automatically at registration.

📊
Live attendee count

Watch registrations appear on your dashboard in real time, from anywhere.

No bottlenecks

One Signtone handles unlimited simultaneous check-ins.

🎁
Instant entry

Every attendee who hears the Signtone is automatically entered into the draw.

📻
Works on radio

Broadcast a Signtone over FM — listeners enter sweepstakes from their couch.

🏆
One-tap winner draw

Draw a random winner instantly from your dashboard. Full audit trail included.

🚫
No paper, no typing

Eliminate paper slips, QR codes, and manual entry entirely.

📄
Instant file delivery

Slide decks and PDFs delivered to attendee phones as they sit down.

💬
Live feedback forms

Push feedback forms to every phone at end of session with a single sound.

🔗
Per-session links

Sponsor links, Wi-Fi credentials, session schedules — each Signtone, its own payload.

🎯
Session targeting

Different Signtones per breakout room. Each room, its own content.

Why Signtone

Built for the moment
of arrival.

Audio encoding
No QR codes.
No NFC.
Just sound.

Any venue that plays audio already has everything it needs. Works from up to 15 metres away.

<10s
Detection
15m+
Range
Live Signtone
Plays from
any speaker.

Laptop, PA system, Bluetooth, or broadcast radio.

Privacy-first
Audio stays
on-device.
Raw audio never uploaded
Only event ID sent to backend
Revoke access anytime
Organizer tools
Live dashboard,
real-time data.
Alex Riverachecked in
Jordan Patelchecked in
Waiting…
US Patent Pending
Sign · the · Tone

A novel audio encoding technology turning any speaker into a frictionless check-in point.

Bluetooth
Hands free.

When the user has Bluetooth connectivity, Signtone plays audio instructions for registration. Users do not have to touch the phone.

Live demos

Watch Signtone
in action.

🎛
Organizer
Dashboard Demo

Create events, generate Signtones, manage attendees in real time.

📱
Attendee
User App Demo

Detection to registration in under 5 seconds.

For organizers

Start your
first event.

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Privacy Policy
Last updated: April 5, 2026

Information we collect

Account information (name, email) when you sign in. Audio processed on-device to detect Signtones — raw audio is never uploaded. Event registration data and device information for compatibility.

How we use it

To register you for events, provide organizers with attendee lists, improve audio detection, and send event notifications you've opted into.

Audio & microphone

Audio processing happens entirely on your device. Only the decoded event identifier is sent to our backend — never raw audio.

Data sharing

We share your registration information with event organizers for events you join. We do not sell personal data to third parties.

Your rights

You can access, correct, or delete your data anytime. Revoke microphone permissions through device settings. Contact privacy@signtone.app.

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Terms of Service
Last updated: April 5, 2026

Acceptance

By using Signtone you agree to these terms. If you do not agree, please do not use the service.

The service

Signtone provides audio-based event registration — a mobile app for attendees and a web dashboard for organizers. Signtones encode event data into audio signals for one-tap registration.

Organizer responsibilities

Use Signtones only for legitimate registration purposes. Comply with applicable privacy laws. Inform attendees that audio-based registration technology is in use at your venue.

Intellectual property

The Signtone encoding technology, app, and materials are proprietary. You may not reverse-engineer or attempt to extract the audio encoding algorithms.

Limitation of liability

Signtone is provided "as is". We are not liable for missed registrations due to audio interference, device compatibility, or network issues.

Contact

legal@signtone.app

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Contact
We'd love to hear from you

General

hello@signtone.app

Privacy

privacy@signtone.app

Support

support@signtone.app

Legal

legal@signtone.app