Bluescreen.live

Simplest screen sharing for presentations and photos.

Optimized for presentations, where 1 frame / second is enough.
(No real-time streaming, uses good quality screen captures instead.)

No cookies, no tracking, no registration, no ads.

No data storage: only in-memory data on server, 1 frame at a time, removed at disconnect or 5 minute timeout.

Goals

Bluescreen.live is a very simple screen sharing service with the goal:

• optimize quality for presentations and text
• very very simple to use
• just plain http polling, so works on any network
• use very little bandwidth
• use very little cpu (battery on mobile)
• should work on old devices, especially older TVs

Example use cases

1. Share on big screen (meeting room)

• open bluescreen.live in the smart tv browser
• anyone can share to the screen without hdmi/adapters/software etc.
• leave the TV on: has rotating random code on the screen

2. Share without big screen (cafés, bars, events)

• presenter on laptop shares QR / link to mobile users
• mobile users can see material on own phone during talk

3. Share on my behalf

• one person can connect to the meeting room screen and use bluescreen
• others can simply share to their screen
• no switching HDMI cables or broadcast adapters

4. Sharing without Teams or Meet

• share your screen to others when not on a call
• no need to setup Teams or Meet just for sharing

5. Sharing at home

• open bluescreen.live in the smart tv browser
• share to the tv from phone (doesn't work yet)

Mobile screen sharing doesn't work yet

Waiting for this issue on Android Chromium:
https://issues.chromium.org/issues/40418135

Hoping Apple someday implements screen sharing for mobile Safari
(no issue tracker yet)

TODOs

Things to improve:

• client: scale quality from JPG to PNG based on bandwidth
• client: don't update if sceen doesn't change
• client: improve robustness and error handling
• client: downgrade from ES6 (cmp. main.js with tv.js)
• client: always show qr code & use "share" button instead of tap screen
• tv client: screen saver of sorts if always on (?)
• server: remove all or most of node dependencies
• server: implement bandwidth and quota limits
• server: implement bad behaving ip banning
• server: move secrets to env variables
• both: reduce and simplify code size to 1/3