Your quiet AI teaching assistant
Capture what you're presenting and get an instant answer or worked solution — always on top, and completely invisible to your class.
No credit card required · Supports Mac and Windows
See it in action
Short walkthroughs of everything extraMind does during a live lesson.
Quick start
Install and sign in in under a minute
Capture & analyze
Get an answer in the middle of a lesson
Hidden from screen shares
Stay invisible to your class
Hands-free hotkeys
Drive it without touching the window
Lesson timer & history
Stay on schedule, keep every answer
Quick start
Install and sign in in under a minute
Capture & analyze
Get an answer in the middle of a lesson
Hidden from screen shares
Stay invisible to your class
Hands-free hotkeys
Drive it without touching the window
Lesson timer & history
Stay on schedule, keep every answer
An extra mind, on top of everything
It floats over whatever you're presenting — nothing to alt-tab to, nothing your class can see.
Instant answers & worked solutions
Capture a slide, a student's question, or a coding task and extraMind streams back a clear answer — or a fully-commented solution in the language you teach.
- Add your own custom prompt to steer every answer
- Follow-up questions keep context
- Answers saved to history
- Replies in the language you choose
extraMind42:15Binary search on a sorted array — a clean, commented solution:
def binary_search(a, target):
lo, hi = 0, len(a) - 1
# narrow the window until it's empty
while lo <= hi:
mid = (lo + hi) // 2
if a[mid] == target: return mid
elif a[mid] < target: lo = mid + 1
else: hi = mid - 1
return -1Invisible on screen shares
extraMind marks its window as excluded from screen capture where the OS supports it — and even the cursor pauses at the panel's edge. Your class only ever sees your slides.
- Excluded from Zoom, Meet & Teams
- Cursor never leaks over the panel
- Transparent mode to see through it
Drive it hands-free
Global shortcuts work from any app, so you never reach for the floating window mid-lesson. A lesson timer keeps you on schedule with a nudge before time's up.
- Capture & analyze from anywhere
- Lesson countdown with alerts
- Minimize to a tiny floating ghost
Three keystrokes, hands-free
You never have to touch the window while you teach.
- Capture whatever you're presenting with ⌘⇧C.
- Analyze it with ⌘⇧A — a private answer streams in.
- Show / hide with ⌘⇧H. Your class never sees a thing.
Simple pricing
Same full app on every plan. AI usage included — no separate API bills to wire up.
- Unlimited on-screen AI help
- Screenshot analysis & follow-ups
- Hidden from screen shares
- Answer history & lesson timer
- AI usage included
- Unlimited on-screen AI help
- Screenshot analysis & follow-ups
- Hidden from screen shares
- Answer history & lesson timer
- AI usage included
- Unlimited on-screen AI help
- Screenshot analysis & follow-ups
- Hidden from screen shares
- Answer history & lesson timer
- AI usage included
Questions
Can my students see it?
No. extraMind marks its window as excluded from screen capture where the OS supports it (macOS, and Windows 10 version 2004 or newer), and hides the cursor over the panel so nothing leaks into your share.
Do I need my own AI key?
No — AI usage is included with your subscription. You just sign in and use it. No API keys, no per-token bills.
Which platforms are supported?
Both — extraMind supports macOS and Windows, from the same codebase.
What can it help with?
Reading a slide and explaining it, solving a coding task with commented code, answering a student's question, or clarifying anything you capture — all without leaving your presentation.
Bring an extra mind to your next lesson
Private, always on top, and invisible to your class.
Try for free