Room code:

What is this?

Web-based software I built to help me teach maths. I use it every lesson, but others use it just for certain key features, such as quickly taking photos of students' work to share with the class. In my lessons, almost everything my students see is via this software - my lessons are prepared in PowerPoint, then rather than presenting the slideshow I cast a cropped portion of the PowerPoint window across an extended desktop to this software, allowing me to use its features like gesture-based annotation with live replays.

Here are some of the killer features you may find useful...

Instantly share student work via your phone

Open the website on your class whiteboard and your phone using the same room code. Then just hit the photo button and snap away. Photos appear on your whiteboard instantly, and you can start annoting over the top.

Annotate with gestures

Use two finger gestures to instantly switch pen colours, highlighters, undo or clear the screen. Makes quickly modelling maths methods a breeze. Move two fingers slightly and wait to see a wheel of gesture options. Learn the gestures and do them fast, and the wheel never appears. In Zen mode (toggle with a 2 finger tap) the UI disappears so your students can focus on what you want them to focus on.

Cast a screen or window

Set Windows to extended desktop (Win+P then 'Extend') and cast a whole screen or window. Crop out the bits you don't want your students to see. Your annotations over the top are ephemeral and completely separate from whatever window you're casting.

Control PowerPoint from within any app

Casting a PowerPoint window works best when combined with a wireless usb presenter (aka 'clicker') and a custom AutoHotkey script I made. Download AutoHotkey and unzip it. Then download my custom script. Double click the script to open it, 'open with' then select 'AutoHotkeyU64.exe' in the folder you just unzipped. You won't need admin permissions this way. Add the script to your Windows startup folder so it runs all the time. With it running, you can use page up/down on your keyboard - or the similarly mapped buttons on your wireless presenter - to switch between PowerPoint slides regardless of whether that window has focus. Any time you do, your annotations on the whiteboard get wiped too.

Instant replays

Record a bit of maths or anything else. Then start an instant replay for your students to watch back your method on loop.

Phone, tablet, interactive board or mouse

Your whiteboard is in sync across all your devices thanks to your own room code. Need to make a quick annotation from the back of the room? Just use your phone. Even better if your tablet or phone has pen support - hover your pen to highlight a part of the screen to students.

Simple UI. Or no UI.

All the most important tools you need to annotate work for the class, tucked away at the sides of your screen. But tap two fingers and the UI simply disappears.

It's fast. Real fast.

And that's a feature. No logging in. No waiting for things to download. Just choose a room code and you're done. No multi-megabye Javascript monstrosity here. Whole thing loads in less than a second, and less than 100kb of resources.

It's 100% free.

My server costs are close to zero. It costs you nothing. Not even your privacy. I may add premium features in the future (unlikely... but possible), but what you see today will always be free.


Video tutorials

I've uploaded several videos to a YouTube playlist showing the ins and outs of how to use the software. I'm happy to make more videos if there's anything specific you'd like me to demonstrate.

Common issues

Devices not in sync? Make sure you're using the same room code on both devices. If either show a persistent red dot top-left instead of a green one (ie it never goes green, even after refreshing the page), that suggests you need to ask your school IT department to "allow or whitelist websockets on mathsuniverse.com".

Photos not syncing from your phone? If your phone has been inactive and the top-left dot has gone red, either refresh or wait a few seconds until it goes green before taking a photo of your student's work


Share and let me know your experiences

Please share if you find this useful for your lessons.
Let me know your experiences via my Twitter account.