Write the notes, run the numbers
An OpenBook page holds a slider and a chart next to the prose, so a note about a budget can also do the arithmetic.
The pages people keep open
Knowledge base
Type @ to link a page. Every heading you write lands in the table of contents.
Lightweight dashboards
Charts read the values your sliders publish. Move a slider and the bars redraw beneath it.
Plans & trackers
Drag a task to Friday on the calendar and the board's due-date column moves with it.
Research notebooks
Keep the method, the numbers and the chart on one page, then export it as one HTML file.
Where the grocery money goes
Pick a basket and nudge the staples. Every slice of the pie recomputes while you drag.
Hand the page to someone else
Present it to a room, or lock the inputs and let a teammate drive.
Teaching & decks
Add a divider, hit present, and the lecture becomes slides with the demo still running.
Shared tools
Lock a group of blocks and send the page. Teammates move the sliders and read the result.
Fit it to your workflow
Start with a blank page and drop a slider into it. Free and open source.