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Fast, flexible notes
Link ideas together, drag them into shape, and find anything again in seconds.
Zen is a calm study notebook with an AI agent built in — one that creates notes, manages your calendar, cites your PDFs, and quizzes you back, instead of waiting for you to do it yourself.
No tab-switching between five apps. Zen keeps your notes, math, reading, and schedule together — so focus doesn't get interrupted by logistics.
Link ideas together, drag them into shape, and find anything again in seconds.
Type an equation and watch it become beautiful as you go — graphs and diagrams too.
Drive, Zotero, GitHub, Canvas, and clipped web pages — all searchable in one place.
A focus timer plus a real study plan that tracks what you actually know.
See and manage your schedule and email without ever leaving your notebook.
Sign in once and your notes, plans, and progress follow you to every device.
Run Zen with your own model key for free, try the managed DeepSeek agent free for a week, or subscribe to DeepSeek Basic. Paid plans use Stripe Checkout.
Run Zen with a model API key you already have. No subscription and no checkout.
Try the managed DeepSeek agent free for about a week. No card required — just sign in.
A capable, budget-friendly agent for day-to-day notes, scheduling, and quizzing.
The Basic plan renews monthly through Stripe. Cancel or switch anytime from Settings — your notes stay exactly where they are.
Sign in so your plan can be linked to your Zen account.