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Write naturally
Handwriting with Apple Pencil or a compatible tablet stylus, plus typing when you need it.
Digital notebook for iPad & Android tablets
Your notes. Finally organized.
Write naturally. Organize notebooks, PDFs, and files with a familiar folder system. Find everything when you need it.
Built for tablets — not iPhone or Android phones.
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Organize everything
Folders inside folders. Notebooks, PDFs, and files together — the way a real workspace works.
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Find anything
Search your notes, handwriting, and documents instead of scrolling through an endless pile.
File organization
Folders that actually work like folders.
Penink uses an Explorer-style file system, similar to Windows File Explorer or Mac Finder. Create folders inside other folders. Keep notebooks, PDFs, notes, and files together however you want.
- University → 2026 → Semester 1 → Biology → Lecture 01
- Work, Personal, and Ideas as real top-level folders — not tags pretending to be folders.
- Move files, nest notebooks, and keep a textbook PDF next to the notes you wrote in it.
My Files
Like Finder & Explorer- My Files
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University
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2026
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Semester 1
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Biology
- Lecture 01
- Lecture 02
- Textbook.pdf
- Computing
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- Work
- Personal
- Ideas
My Files on iPad — folders, notebooks, and favorites in a real file explorer.
Handwriting
Made for handwriting.
Writing should feel natural and simple. Use Apple Pencil on iPad, or a compatible stylus on an Android tablet. Fountain, ballpoint, pencil, and brush — with the stroke and colour you want.
Apple Pencil
Pressure, tilt, and palm rejection on iPad, in landscape or portrait.
Android tablet styluses
Built for the larger Android tablet screen — not a phone note app stretched up.
The Penink idea
Write naturally. Organize everything. Find anything.
Penink is a digital notebook and personal workspace designed specifically for iPad and Android tablets.
PDFs
Your notes and documents, together.
Read a textbook, highlight a paper, and write in the margin — then keep that PDF in the same folder as the notebook you used while reading it.
PDF annotationPhotosynthesis
Plants convert light energy into chemical energy. Chlorophyll absorbs mostly blue and red wavelengths...
Light-dependent reactions occur in the thylakoid membrane.
Check lecture 02 diagram →
Tabs
Keep several documents open.
Move between a notebook, a PDF, an assignment, and research without losing your place. Tabs are built for tablet work, not for a phone.
Open now
Biology Notes
Handwritten lecture from Tuesday. Next tab is the textbook PDF you were annotating.
Waiting in tabs
- Textbook.pdf — chapter 4 highlighted
- Assignment — due Friday
- Research — paper on enzyme kinetics
Split view
Textbook on one side. Notes on the other.
Students, researchers, and professionals can read and write at the same time. Split view is one of the reasons Penink is tablet-first.
Textbook
Page 142
Chapter 4 — Cell membranes
The phospholipid bilayer is selectively permeable. Proteins embedded in the membrane control what enters and leaves the cell.
Handwritten notes
Membranes — lecture 6
Selective permeability = not everything passes.
Ask: what do proteins do here?
Search
Find anything you've written.
Search notebooks, handwriting, PDFs, and other files. When you have hundreds of notes, the folder system keeps them organized — search gets you back to a sentence.
How search works
thylakoid
Handwriting · Biology / Lecture 02
“…light reactions in the thylakoid membrane…”
PDF · Textbook.pdf
Chapter 8 heading: The thylakoid and stroma
Notebook · Exam revision
Flashcard: Where do light-dependent reactions occur?
Smart tools
Helpful with your notes. Not the whole identity of the app.
Penink can summarize, explain, create flashcards, and find related information — from the notes and documents you already wrote. Handwriting and folders come first.
Summarize notes
Get the shape of a lecture or meeting without rereading every page.
Explain notes
Ask Penink to walk through a section you wrote last week.
Create flashcards
Turn existing notes into cards you can actually revise from.
Study questions
Generate questions from your own material before an exam.
Find related notes
Surface connected pages, PDFs, and ideas across your folders.
Work with what you have
Smart tools help you use your notes. They are not the product.
Use cases
A tablet workspace for how you actually work.
Studying
Lectures, readings, and revision in folders that match your courses.
University
A year, a semester, a subject — nested the way your degree is nested.
Work
Projects, clients, and documents without a single dumping-ground notebook.
Meetings
Handwritten notes filed under the project they belong to.
Research
PDFs, highlights, and handwritten thoughts in one explorer.
Planning
Weekly plans and personal notes beside the files they refer to.
Penink for
Students
Lectures, textbooks, assignments, and exam revision — organized the way a semester actually works.
Penink for
Professionals
Meetings, projects, research, and documents in one tablet workspace you can actually find later.
Penink for
Personal
Journals, plans, ideas, and everyday notes without dumping everything into one endless scroll.
Every feature
Built as a tablet notebook, not a phone app.
Handwriting
Write naturally with Apple Pencil or a compatible tablet stylus. Fountain, ballpoint, pencil, and brush — on paper that feels like paper.
File organization
Create folders inside folders. Keep notebooks, PDFs, and files together the way you already think about them — like Finder or File Explorer.
PDF annotation
Read, highlight, and write on PDFs next to your notebooks. Textbooks, assignments, and research live in the same workspace.
Search
Search notebooks, handwriting, PDFs, and files. Penink helps you get back to the sentence, lecture, or document you need.
Study tools
Create flashcards and study questions from the notes you already wrote — useful before exams, not instead of writing.
Smart tools
Summarize, explain, and find related information in the notes and documents you already have. Smart tools sit beside handwriting — they don’t replace it.
Download
Get Penink on your tablet.
Available for iPad and Android tablets. Penink is not a phone app — it is built for the bigger screen.
Built for the bigger screen. Apple Pencil and compatible Android styluses.