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About

Built to get out of your way.

Every presenter knows the ritual: you arrive at the venue and lose the first ten minutes to an adapter hunt, a borrowed cable, a shared-laptop login, or "can you email me the deck?". Technology meant to connect you to an audience disconnects you before you've said a word.

Find the right adapter−4 min
Log into someone's laptop−3 min
Email the deck, hope nothing changed−2 min
Fight the guest Wi-Fi portal−1 min
Scan a QR code with your phone+30 s → presenting
Under the hood

What actually happens when you scan.

1

The screen opens a session

Any browser — projector, TV, laptop — creates a session and displays a QR code with a unique 4-character PIN.

UUID + PIN · in-memory only
2

Your phone joins

Scanning the QR (or typing the PIN) connects both devices over WebSocket, and they negotiate a direct WebRTC DataChannel — an encrypted peer-to-peer tunnel that bypasses the server.

WebRTCDTLS-SRTP encrypted
3

Slides render locally

Your PDF or images are rendered to WebP in your browser, on your device. A Full HD slide weighs 80–200 KB — sharp on a big screen, light on the network.

PDF.js in-browserWebP 80–200 KB
4

…and travel peer-to-peer

Slides go straight from phone to screen. If a firewall blocks WebRTC, the connection silently falls back to a WebSocket relay — a pure forwarding pipe that stores nothing. The presentation never skips a beat.

P2P firstWSS relay fallbackports 443/80 only
Principles

Three rules the product never breaks.

Rule 1

Content never touches servers

Slides, text, images — never uploaded, never stored, never inspected. Session metadata lives in memory and dies with the session. IPs are one-way hashed (SHA-256) before any use.

Rule 2

Zero friction, zero accounts

No installation, no sign-up, no tracking cookies, no third-party analytics, no advertising identifiers. Under 30 seconds from nothing to presenting.

Rule 3

Free stays free

Unlimited sessions of up to 3 hours each, at no cost. Organizations needing self-hosting, branding, and unlimited durations can license Enterprise.

What's next

Roadmap: reliability first, then presentation tools.

SyncBy!App is built and run by one developer, so the roadmap is deliberately short and honest: keep connections rock-solid across hostile networks, keep rendering fast, and then layer in advanced presentation tools. No feature bloat, no pivot to a "collaboration platform".

Get in touch

Questions, feedback, or just to say hello?

Partnership inquiries welcome too. Everything gets read.

syncby@proton.me