Thallo app icon

Look at the question.
Get the answer.

AI answers for any question on screen.

For in-person classes

Put your cursor on the question and press Ctrl + Alt + Space to get the answer.

Menu bar iconSystem tray icon WindowsMac

The answer appears as a small mark in the menu barsystem tray — one glance and back to work.

Caps Lock LED WindowsMac

The Caps Lock light blinks once for A, twice for B. Nothing to look at, nothing on your screen.

For online classes (Beta) Windows

Press Ctrl + Alt + Space, place the cursor near the question, then press Enter.

  • Z
  • M
  • W

A tiny answer window, while your camera and screen share stay exactly as they were.

And more options (Beta)

Your keyboard or screen signals the answer: once for A, twice for B.

Keyboard Backlight WindowsMac

The keyboard backlight pulses out the answer.

Screen Brightness WindowsMac

The screen brightness pulses out the answer.

Audio Ticks WindowsMac

Once for A, twice for B — through any headphones. Nothing on screen, nothing on camera.

Screen Flash WindowsMac

A quiet green veil over your own screen, letter inside. For in-person desks.

Start for free.

Find answers to questions on your screen with AI.

Pro

For students who need quick answers, every day.

$9.99

per month · 500 answers

  • Multiple-choice and short answers
  • All four answer channels
  • Monthly reset, cancel anytime
  • Priority updates

Max

Great value for heavy users who answer all semester.

$19.99

per month · 1,500 answers

  • Everything in Pro
  • Up to 1,500 answers
  • Two devices
  • Priority support and early access

FAQ

Does Thallo work on Windows?

Yes. On Windows you get the system-tray icon (with the answer letter), the hidden answer window for online sessions, the Caps Lock blink, keyboard-backlight, brightness and audio-tick modes. Mac adds the menu bar.

Can my screen be seen by the proctor?

The hardware channels (Caps Lock LED, backlight, brightness, audio) are physically outside any screen share — no capture API can see them. The hidden answer window is excluded at the compositor level on Windows (WDA_EXCLUDEFROMCAPTURE), so screen shares and screenshots never contain it. One honest note: on Macs running macOS 15+, Apple's new ScreenCaptureKit ignores every app's hiding flags — so on a modern Mac use the hardware channels for proctored exams, not the answer window.

I subscribed. How do I start using it?

Download the app and sign in with the Google account you subscribed with. Your plan is applied automatically — see My licence key any time.

How accurate are the answers?

Thallo runs each question through two independent models and keeps the answer only when they agree. When they don't, it abstains — a quiet miss beats a loud mistake. AI can still be wrong; use your judgement.

Does it work with short-answer questions?

Yes. Numeric and short-text answers appear in the answer window and the menu-bar popover. The blink codes (Caps Lock, backlight, brightness) cover multiple-choice answers.

Can I cancel anytime?

Yes. Manage subscription opens your payment portal where you can cancel; you keep full access to the end of the paid period. New plans are covered by the 14-day refund policy.