Free for students · Philippines & worldwide

Highlight anything.
Cassie explains it.

Your AI study buddy for readings, homework and reviewers — on any website, PDF, slide deck or photo. She explains the why, so it actually sticks.

Start free
No account needed Your notes stay on your device Phone, web & Chrome
Any websitePDFsGoogle DocsGoogle SlidesPowerPointWord filesPhotos of your notesGraphs & diagramsYour phoneChrome Any websitePDFsGoogle DocsGoogle SlidesPowerPointWord filesPhotos of your notesGraphs & diagramsYour phoneChrome
How it works

Three moves. That’s it.

No prompts to learn. Cassie meets you where you’re already studying.

1

Highlight or snip

Select a sentence, drag a box around a graph, or drop in your PDF, slides or a photo.

2

Ask Cassie

Explain, answer, write code — or ask for a reviewer, a quiz or flashcards.

3

Actually get it

Step-by-step reasoning, real graphs, and a board to try it yourself. Then save it as Word, PDF or an image.

Meet Cassie

She shows you what she’s doing.

Cassie is a cursor with feelings. While you study, she reads, thinks, searches and celebrates with you, so you always know what’s happening.

Tap Cassie to poke her.
Features

Everything a study buddy should do.

Built for real coursework — readings, problem sets, lab reports and the night-before review.

Highlight anything

Explain it, answer it, or write the code — right on the page, with follow-up questions.

Snip a graph. Sketch on it.

Grab any picture, graph or question. Cassie explains it on a board beside the page.

PDF in. Reviewer out.

PDFs, PowerPoint and Word files — diagrams included. Save the reviewer as Word, PDF or an image.

Real graphs

No ASCII art. She draws the graph — then you try.

Your own focus timer

25/5, 50/10 or whatever works for you.

She remembers

Your topics, weak spots and streak — kept on your device.

Real talk

When it’s not about homework, she listens — honest, never just flattering.

Made for learning, not for test time.

Cassie explains the reasoning, quizzes you, and turns your lessons into reviewers. She’s for readings, homework and review — not for use during a test or quiz.

Because the point isn’t the answer. It’s you knowing it.

Private by design

Your notes are yours.

Account optional

Use Cassie without signing up. Make an account and only your profile, settings and saved quiz mistakes sync — never your chats or files.

On your device

Chats, memory and reviewers are saved in your browser — export a backup any time.

Bring your own key

Power users can plug in a free Groq or Gemini key for unlimited use on the free plan.

Pricing

Student prices. Seriously.

Free forever, no card needed. Upgrade when Cassie becomes part of how you study.

Free

See what Cassie can do. Best for trying it out.
₱0forever
No card needed
Start free
  • 20 questions a day — chat, quiz & highlight
  • 3 file reviewers a month (PDF, slides, Word)
  • 10 pictures a month
  • Board, graphs, focus timer, memory & sync
  • Unlimited with your own free API key
Most popular

Plus

Study as much as you want. Best for everyday school.
₱149/ month
billed monthly · cancel anytime
Join the waitlist
  • Unlimited questions*
  • 30 file reviewers a month
  • 100 pictures a month
  • Reads photos, diagrams & handwriting
  • Save as Word, PDF or image

Pro

Everything, unlimited. Best for finals season — every season.
₱499/ month
billed monthly · cancel anytime
Join the waitlist
  • Everything in Plus
  • Unlimited questions*
  • Unlimited file reviewers*, including whole books
  • Unlimited pictures*
  • Smartest models first

*Unlimited means normal studying by one person, not shared accounts or automated use. Paid plans are launching soon — everything on Free works today.

FAQ

Questions, answered.

Is Cassie really free?

Yes, forever, with no card needed: 20 questions a day, 3 file reviewers and 10 pictures a month. If you add your own free Groq or Gemini key, you can use Cassie as much as you like.

What can she read?

Any website you highlight or snip, PDFs, PowerPoint and Google Slides, Word files and Google Docs, and photos or screenshots of your notes — including the diagrams and graphs in them.

Does it work on my phone or tablet?

Yes. Open Cassie in your browser and add it to your home screen. For PDFs, Word and PowerPoint, attach the file and tap 📖 Read & highlight: read it inside Cassie and highlight any part. In other apps: on Android, select the words → Share → Cassie. On iPhone and iPad, set up the one-time “Ask Cassie” Shortcut (steps in Cassie → Settings → Use Cassie in other apps). Screenshots and photos of your notes work too. The on-page popup and snipping on a computer come with the Chrome extension.

How do I add Cassie to Chrome?

Download the Cassie extension, then unzip it. Open chrome://extensions, turn on Developer mode (top right), click Load unpacked and pick the cassie-extension folder. Pin Cassie from the puzzle-piece menu and add your free Groq key. Works in Chrome and Edge on a computer.

Where do my notes and chats go?

They’re saved in your own browser, not on our servers. Your question and any file you attach are sent to the AI service to get an answer, and that’s it. If you make an account, only your profile, settings and saved quiz mistakes sync. You can export a backup or clear everything at any time.

Can I use Cassie during a test or quiz?

No — and please don’t. Cassie is built for studying: understanding readings, practising, and making reviewers. Using her during a graded test or quiz isn’t what she’s for.

How do I pay from the Philippines?

When paid plans launch you’ll be able to pay in pesos with local options like GCash and Maya, or by card. Everyone else pays in US dollars.

Study with Cassie tonight.

Free, private, and ready on any page you’re reading.

Open Cassie — it’s free Get the Chrome extension