Heptagonal is a pen-driven whiteboard for teaching maths and science. The main toolbar runs across the top: pens and the eraser on the left, then text, shapes, diagrams, instruments and presentation tools (laser, spotlight), with the view controls (select, pan, zoom) and the page menu on the right.

Everything you draw lives on a page. Pages are grouped into chapters, chapters into books, and books onto shelves — open the library to move between them. Your work is saved automatically on this device; sign in under Account & Sync to back it up to the cloud and use it on any computer.

On a projector, pick a high-contrast theme in Appearance, and learn the pen number keys (1–4) and Select (S) so you can change tools without leaving the board.

Four pens sit on the toolbar and are selected with keys 1–4. Each pen has its own colour and style — change a pen's colour from its options strip below the toolbar, and redefine the shared colour palette under Appearance. The eraser (E) removes ink; the text tool (T) drops a text box you can type into and reposition.

Ink colour adapts automatically to the page background, so light pens stay visible on dark paper and dark pens on light paper.

Heptagonal organises work as a tree: a shelf holds books, a book holds chapters, and a chapter holds pages. Open the library to browse it, switch pages, and rename or reorder items by dragging.

Each page keeps its own drawing and its own target view — the framing it returns to when you reset the view. Add pages within a chapter as you teach; the page menu controls the current page's background and layout.

Turn any page or whole chapter into a reusable template so you don't rebuild the same layout each lesson. Save the current page or chapter as a template, then start a new page or chapter from it whenever you need it. Templates are kept on this device.

Chapters keep a history of saved versions. If you need to step back — after an accidental change or a class experiment — open the chapter's history and restore an earlier version. Restoring brings that version back as the current chapter.

The geometry menu provides on-screen instruments: a protractor, a ruler and a set square, plus tracing paper. Selecting an instrument toggles it on, centred in the view you're working in; selecting it again puts it away. Instruments float above your work and aren't part of the page, so they're never saved or caught by a lasso selection.

Tracing paper is a separate transparent sheet you can draw on, then move, rotate and reflect over your work — useful for symmetry and transformations. Its Clear button wipes the sheet's ink without removing the sheet.

The 2D shapes tool draws common polygons and shapes you can resize and recolour; the 3D shapes tool places solids for work on nets, surface area and volume. Fraction models give bars and shapes split into equal parts for teaching fractions, equivalence and operations — adjust the number of parts and shade them as needed.

The diagrams menu covers the visuals you reach for most: Venn diagrams, tree diagrams, angle diagrams, pie charts and labelled times-tables grids.

The layouts menu stamps ready-made frameworks onto the page — coordinate axes (full four-quadrant or first-quadrant), bar and line axes, place-value and hundred-square grids, ten frames, a fraction wall, a two-way table and a clock face — so you can start a task without drawing the scaffold by hand.

For science lessons, place standard circuit symbols and wire them into diagrams, drop in a periodic table, build molecules from atoms and bonds, and add plan-and-elevation views for 3D representation work. Each is added to the page like any other object and can be moved and resized.

The graph tool plots functions on a coordinate grid — type an equation and it's drawn live, including implicit equations (relations in x and y). Pan and zoom the graph to frame the part you want, and combine several plots on one set of axes for comparison work.

The reduced TeX editor lets you type mathematical notation in LaTeX and inserts it onto the page as cleanly rendered maths — useful for equations that are awkward to write by hand. An on-screen calculator and a lesson timer are available as floating widgets you can show during a class.

A sub-canvas is a separate drawing surface that opens from an anchor on your page — a place for rough working, a worked example or a side note that you can expand when you need it and tuck away afterwards, keeping the main board clean.

Bring a PDF into a page to annotate over worksheets or past papers, and export your chapter to PDF to share or print. Exported pages capture your drawing as it appears on the board.

Right-click a book or shelf in the library and choose Import PowerPoint to bring a .pptx in as a new chapter — one page per slide. Text, shapes and pictures come across as editable objects, and equations such as fractions are converted to editable maths where possible.

Import is best-effort: complex layouts, fonts and effects may not match the original exactly, and a few items may not convert at all. Always check the imported slides before teaching from them.

If you belong to an organisation, you can publish a chapter to its shared library so colleagues can use it, and copy shared chapters back into your own library to adapt. Publishing sends a copy — your original stays yours, and edits to either side are independent.

Your work is always kept on this device, so the board keeps working without a connection. When you're signed in, changes sync to the cloud so you can pick up on another computer.

If the same chapter is changed in two places while offline, Heptagonal keeps both by forking the chapter rather than overwriting, so nothing is lost — you can then keep whichever you want.

A Pro subscription unlocks the geometry instruments, science tools, sub-canvases, saved objects and cloud sync. Manage or start a subscription under Account & Sync. If your access is provided through an organisation, Pro features are included while you're a member.

What we collect. If you create an account, we store the email address and display name you provide, and the chapters, pages and settings you choose to save to the cloud. Drawings and documents you create are stored so they can sync across your devices.

How we use it. Your data is used solely to provide the service — to sign you in, save your work, sync it between your devices, and process subscription payments. We do not sell your data or use it for advertising.

Where it is stored. Account data and saved work are held using our hosting and authentication provider (Netlify). Payments are processed by Stripe, which receives the information needed to take payment; we never see or store your full card details.

Cookies & local storage. We use your browser's local storage to keep your work available offline and to keep you signed in. We do not use third-party advertising or tracking cookies.

Retention. We keep your data for as long as your account is active. You can delete your saved work at any time, and you can request deletion of your account and associated data by contacting us.

Your rights. You may request access to, correction of, or deletion of your personal data. To do so, use the Contact tab or email info@heptagonal.app.

Acceptable use. Heptagonal is provided for lawful educational use. You agree not to misuse the service, attempt to disrupt it, or use it to store or share unlawful content.

Your content. You retain ownership of the chapters and drawings you create. You are responsible for the content you produce and for keeping your own backups (see Library backup).

Accounts. You are responsible for activity under your account. Keep your sign-in details secure.

Subscriptions. Pro features require an active subscription or a granted access role. Subscriptions renew automatically until cancelled; you can cancel at any time from the Account tab, and cancellation takes effect at the end of the current billing period. Any free trial converts to a paid subscription unless cancelled before it ends.

Availability. The service is provided "as is" without warranties. We aim for high availability but do not guarantee uninterrupted access, and we are not liable for loss of data — please keep your own backups.

Changes. We may update these terms; continued use after changes constitutes acceptance.

Roles. Where you use Heptagonal in a school or organisation, you (or your institution) act as the data controller for any personal data you enter, and we act as the data processor, processing it only to provide the service and on your instructions.

Sub-processors. We use trusted providers to deliver the service, including Netlify (hosting, authentication and storage) and Stripe (payment processing). These providers process data on our behalf under their own data-protection commitments.

Security. Access to stored work is scoped to your account, and payment data is handled by Stripe, a PCI-DSS compliant provider. We take reasonable technical measures to protect your data, though no online service can be guaranteed perfectly secure.

International transfers. Our providers may process data outside your country; they maintain appropriate safeguards for such transfers.

Data subject requests & breaches. We will assist with reasonable requests relating to access, correction, or deletion of personal data, and will notify you without undue delay of any personal-data breach affecting your data. Contact info@heptagonal.app.