SemaBuzz logo SEMABUZZ
Get it from Microsoft
Live text  ·  1:1  ·  Free

You see every letter
as they type it.

No send button. No waiting. Every keystroke streams to the other person the instant you press it — like sitting side by side. The way chat used to feel, before everyone added a send button.

Download for Windows How it works
What makes it different

Live text — not just
“typing…”

A typing indicator tells you someone is writing. SemaBuzz streams the actual letters — you read the message as it's written, character by character. Conversations feel present, not exchanged.

🔗  URL Walk Paste a URL and it walks across their screen live. One click opens it. Inspired by PowWow, 1996.
✎  Shared whiteboard Open a live drawing board. Both sides draw at once — strokes stream encrypted in real time.
🌞  The filament A waveform at the bottom of the window pulses with keystroke velocity. You feel the energy before you read the words.
📄  File transfer Drag in a file (up to 10 MB) and send it through the encrypted session. SHA-256 verified, single-use, auto-expires in 10 min.
Feature
SemaBuzz
Others
See letters as typed
✓
✗
Keystroke intensity visualisation
✓
✗
No send button
✓
✗
End-to-end encrypted
✓
varies
No account required
✓
✗
No message storage
✓
✗
Send files (up to 10 MB)
✓
✗
Buzz for attention
✓
✗
URL Walk (share links live)
✓
✗
Shared whiteboard
✓
✗
How it works

Live in four steps

No accounts. No history. Nothing left behind.

🔑
01

Host a session

Open SemaBuzz and start hosting. You get a short token to share with one person.

✅
02

Approve the join

A connect request arrives. You tap Accept — nobody gets in without your say-so.

⚡
03

Type live

Every keystroke streams instantly. They see each letter as you press it.

🚪
04

Close and it's gone

No history, no logs, nothing to delete. The conversation ends when you close it.

Built different

Private. Expressive. No cruft.

Faster than email. More private than a group chat. More deliberate than a call.

⚡

Instant

No send button. No typing indicator. Just words, arriving live as they're written.

🔒

Encrypted end-to-end

ECDH P-256 key exchange, AES-256-GCM encryption. Keys live on your device only — the relay sees ciphertext it cannot read.

💬

Expressive

100+ emoji, a live shared whiteboard, a file drop, and a buzz button for when words aren't fast enough.

🌏

Direct when possible

SemaBuzz punches through NAT with STUN hole-punching. When it works, the relay drops out entirely and traffic flows peer-to-peer.

  • No account, no email, no sign-up — share a token and go
  • No message storage on any server — session ends, everything's gone
  • Peer-to-peer when possible — relay is a fallback, not a requirement
  • Custom relay URL baked into tokens — guests auto-connect, no setup needed
  • Sessions are ephemeral — when the wire drops, nothing is left behind
  • File transfer — up to 10 MB, SHA-256 verified, single-use link, 10-min expiry
  • Buzz button — shake their window without switching to voice
  • Emoticon picker — 7 categories, 100+ emoji
  • Shared whiteboard — live strokes, both sides, encrypted over the wire
Quick FAQ

Got questions?

  • How is this different from a “typing…” indicator? A typing indicator tells you someone is writing. SemaBuzz streams the actual letters live — you read the message as it's written.
  • Does SemaBuzz store chat logs? No. Nothing is saved anywhere. When the session ends, it's gone.
  • Can the relay read my messages? No. It only forwards ciphertext it cannot decrypt. When a direct P2P path is open, the relay isn't in the loop at all.
  • Can I send files? Yes — up to 10 MB. Drag a file into the chat window while a session is live. SHA-256 verified on arrival, link expires in 10 minutes.
  • Does it support emoji? Yes. Built-in picker with 100+ emoji across 7 categories. Click the smiley icon next to the input bar.
  • Can I use my own relay? Yes. Set a custom relay URL in Settings and it gets baked into your session tokens — guests auto-connect, no manual setup required.
Full FAQ  ›
Self-host

Run your own relay — free

Don’t want to use the default relay? One binary, any machine, no runtime required. Blind pass-through — it never reads or stores message content.

Windows

Single .exe — no install, no runtime required. Double-click or run from PowerShell.

Download for Windows

Linux

Single binary for x64. Works on Ubuntu, Debian, Rocky, and most distributions.

Download for Linux
  • Blind pass-through — the relay never reads or stores message content
  • IP addresses held in memory for the session only — nothing written to disk
  • Defaults to port 7171 — override with --port 8080 or the PORT environment variable
  • Stop with Ctrl+C, or pkill / Stop-Process for background use
  • No runtime required — single self-contained binary

Ready to get buzzing?

Share a token. See every letter live. No accounts, no sign-up, no waiting.

Download for Windows Read the FAQ