Numbr — linked canvas calculator

Numbr Friends beta

This is an early private beta.

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Help test Numbr

Try creating, linking, moving and deleting cards; undo and redo; refresh the page; Save and Open a file; and try it on a phone.

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Beta 1 · 2026-08-29

Numbr — quick guide

A free-form, linked canvas calculator inspired by Tydlig and OpalCalc. Everything autosaves in your browser.

The canvas

Double-click empty canvas to start a new card anywhere. Enter adds a line in the current card, Shift+Enter starts a new card below, and Ctrl/Cmd+Enter finishes editing.
Drag empty canvas around cards to create a named, colored group. Hold Space while dragging (or use the middle mouse button) to pan the infinite canvas.
Drag ⠿ (top of a card) to arrange lines however you like.
Drop a card inside a group to add it. Drag the group title to move every member, drag any corner to resize it, or right-click a card to remove it from the group.

Live links & arrows

Drag a result into another line’s formula — a pill showing the live number appears, and an arrow is drawn back to the source line. Change the source and everything downstream updates instantly.
Drop a result on empty canvas to spawn a linked continuation line.
Drag a pill from one formula into another to re-link it. Click a pill to jump to its source.
Prefer typing? Reference any line as #3 — it renders as the same live pill.
With an empty line focused, typing + − × ÷ ^ % automatically continues from the nearest result above.

Variables & solving

Name a number anywhere: price = 2.5 — the card gets a green price = tag.
Use it in any formula: price * qty — each variable renders as a live green pill showing its value, with an arrow back to its definition. Click a pill to jump there; change the definition and every use updates.
Drag a definition’s result into a formula to insert its variable name.
Solve equations with one unknown: 2x + 6 = 20 → x ≈ 7. Solved numerically over −100…100, work shown under the card. 5x^2 + 25 = 2 has no real solution — it will tell you.

Zooming

Pinch on trackpad or phone, scroll the mouse wheel, or use the ＋ − ⌖ buttons (⌖ fits everything). Hold Space and drag the background to pan.

Scrubby numbers

Hover any plain number in a formula and drag left/right to scrub its value — watch the whole chain update live. Hold Shift for fine steps.

Notes in the math

Every card has an italic note field, and ordinary words inside a formula are simply ignored: 84.50 dinner + 12 tip works fine. A line of only words is a pure note.

Math

Operators + − * / ^ ( ) !, percent: 200 + 7% = 214, 50 * 10% = 5.
Functions: sin cos tan asin acos atan sinh cosh tanh sqrt cbrt exp ln log log2 abs sign round floor ceil trunc min max pow hypot deg rad fact
Constants: pi π e tau τ phi φ. Scientific notation like 1.5e6.
Graphs: add a ∿ Graph card and plot with x, several curves separated by commas: sin(x), x^2/8. Drag to pan, scroll to zoom, hover to inspect.

Workspaces & cloud sync

The tabs at the top are workspaces: ＋ adds one, double-click renames it, × closes it. Each keeps its own cards, pan and zoom.
☁ Sync gives the current workspace a private code. Open …?ws=CODE on any computer to pull it there. With auto-sync on, edits push automatically and the workspace pulls on open/focus. Requires Cloudflare Pages hosting with the included functions folder and a KV namespace bound as NUMBR_KV.

Keypad

The ⌨ button pops up a number pad with common operators that type into the current line at the cursor (⌫ backspace, C clear, ⏎ new line below).
Press fx for scientific functions — tap to insert at the cursor, or drag a chip into any formula.

Install & float

⤓ Install (appears in Chrome/Edge) installs Numbr as its own app — own window, Dock/Start-menu icon, works offline. On Mac Safari, use File → Add to Dock instead.
⧉ Float pops Numbr into a compact window that stays on top of everything — perfect for a calculator beside your other work. Close that window to bring Numbr back here (Chrome/Edge on desktop).
Windows power tip: PowerToys’ “Always On Top” (Win+Ctrl+T) can pin the Numbr window permanently.

Data

Autosaves locally · Save/Open for .json files · Copy text for plain text · Print for PDF.