Undertone: Talk Through Noise
Group voice for loud places
About
Facilitates clear group voice conversations in extremely loud environments without needing an internet connection. Users can easily join or host private rooms using a simple code or QR scan, with individual volume controls for each participant.
What's New in Undertone
2.0
October 24, 2026
Undertone 2.0 — push to talk, Android friends, and a big reliability pass: • Push to talk rooms — host a room where one person speaks at a time. Hold Talk to speak, let go to listen; see who's talking and who's next; the host can take the mic. Up to 16 people, and it works farther apart than a live conversation. Every phone needs 2.0 for push to talk. • Android friends — with Undertone for Android, iPhone and Android can share a room when everyone is on the same Wi-Fi network or a phone hotspot. • Finds rooms on more networks (hotspots, shared Wi-Fi) and rejoins faster when a link drops instead of leaving you hanging. • Encrypted rooms hardened — no silent fallback to unencrypted audio, a key-reuse bug is fixed, and replayed audio is rejected. • Radar direction fixes, large-text layouts, iOS 27 support, and dozens of smaller fixes.
MoreDeveloper apps
FAQ
How does Undertone work in loud places?
Undertone uses direct peer-to-peer wireless connections to create a private voice channel. This bypasses the need for internet and allows for clear communication even in environments with high ambient noise.
Does Undertone require an internet connection?
No, Undertone does not require an internet connection. It connects devices directly using local wireless technology, making it functional in basements, airplanes, or remote areas.
How do I join a conversation in Undertone?
You can join a conversation by scanning a QR code provided by the host or by typing a 4-digit code. This process is designed to be quick and requires no account sign-up.
Can I control the volume of other people in Undertone?
Yes, you can adjust the volume of each participant individually to your preference. You can also mute someone privately without them knowing.
What devices are supported by Undertone?
Undertone requires an iPhone running iOS 17 or later. The friend radar feature is available on iPhone 11 and later models.
What is the maximum number of people that can join a room?
Each room can accommodate between 2 to 8 people. Participants should be within approximately 30 feet of each other for optimal connection.
Is my conversation private with Undertone?
Yes, Undertone is private by architecture. There are no servers, nothing is recorded or uploaded, and conversations are ephemeral, disappearing when the room ends.
Does Undertone have ads?
No, Undertone does not contain advertisements. It is a completely free application with no in-app purchases or ads.
