The directory
Everything it does
Seven groups, 56 things the shipped product does today, each named with the lane that built it. 5 of the 14 feature loops play on the front page; the rest play here. Nothing on this page is planned — if it is here, it is in the app.
- groups
- 7
- shipped features, each naming its lane
- 56
- feature loops across the two pages
- 14
Windows desktop
Sheaf Desktop for Windows
Work with worksheets in folders on your computer, and bring selected STAAD tables into your calculations. Sign in to Sheaf to use the desktop app. A cloud workspace is optional for local work.
- Local folders and attachments
- Open a local folder, create worksheets, and save or reopen .sheaf files with their attachments. The Local Workspace rail panel keeps file controls beside your document.
- An optional cloud copy
- Add to cloud uploads a separate copy to a workspace you choose. Local files stay on your computer; later edits to the local and cloud copies are separate.
- STAAD table browser
- Search a 41-table catalogue, choose entities, cases and columns, and preview values with units and source origin. Insert a snapshot or a refreshable table where supported, retaining authored formula columns on refresh.
- Desktop controls
- Use full screen with F11, manage the STAAD connection in Desktop settings, and open local files from the right rail.
Table imports tested with STAAD.Pro CONNECT Edition V22 (22.00.00.015) on Windows. Other versions are not yet verified. Available tables vary by model and version; the catalogue covers defined table projections, not every OpenSTAAD getter.
01
Write the mathematics
Natural notation in a live field, evaluated top to bottom by a symbolic engine with the units carried through every operation.
- Natural notation
- Type ≔ and the field becomes a definition. Fractions, roots, subscripts and Greek as you would write them; = evaluates in place.
- CC-P2c
- Units are load-bearing
- Every value is a quantity. Adding a moment to a length is a typed refusal, never a silent number. Preferred display units per dimension; custom units per workspace.
- CC-P3a
- A library of built-in functions
- Trigonometry to special functions and distributions; matrices, ranges, Σ and Π; and your own f(x) ≔ beside them.
- CC-F3
- Show your working
- The substitution line prints under the result, so a checker sees the numbers that went in without opening anything.
- CC-C4
- Formulas that break across lines
- A long formula wraps at its own seams, on screen and on paper, and edits in place without the page shifting.
- CC-L51
- Symbolic →
- Simplify, expand, factor, differentiate and integrate in the same field, symbolically.
- CC-P7
- Predefined constants
- g_n, N_A, k_B and their kin, exact by definition, shadowable with a warning rather than an error.
- CC-C42
Show your working
The substitution line prints under the result, so a checker sees the numbers that went in without opening anything.
LOOP-02
Animation off — showing the result.
02
Change one thing
A sheet is a calculator the moment an input moves. Everything downstream re-inks, nothing goes stale in silence, and the logic is written where it can be read.
- Inputs and controls
- Sliders, dropdowns, toggles and steppers bound to definitions, on the sheet and in a table column.
- CC-C7
- Solve blocks
- Name the unknown and give the constraints. An exact route where a closed form exists, Newton otherwise, and the guess selects the root.
- CC-P7
- Programs
- Branches and loops in a small interpreter that never runs eval. A definition with parameters is a function the sheet calls.
- CC-P7
- The trace
- Step through a figure's program: the gutter shows each row's value, and the canvas lights the shapes that row drew.
- CC-FUI1c
- Zones
- Scope a run of blocks: keep it off paper, show it only when a condition holds, number its sections.
- CC-C6
- Checks with verdicts
- η ≤ 1.0 and the chip says so. Two-bound bands, a failed check that shows its value, and a rail that lists every check on the sheet.
- CC-C39
- Manual calculation, calc from here, a Watch panel
- Hold the sheet still while you edit, recompute from a chosen region, and watch the values you care about.
- CC-P7b
Programs, not nested IFs
A branch is a branch. The condition is visible in the sheet rather than buried in a formula bar.
LOOP-08
Animation off — showing the result.
Zones
Scope a set of blocks and reuse them. It answers a question a first visitor does not have yet.
LOOP-07
Animation off — showing the result.
03
Draw it
A figure is geometry bound to the sheet's variables. Coordinates are expressions with units, the picture is derived rather than stored, and it prints as vectors.
- Parametric figures
- Bindings flow in, measurements flow out. Change a variable and the drawing redraws; a measured length is a document symbol.
- CC-PF1
- A CAD hand
- Typed coordinate entry, eight kinds of snap, grips on every point, trim, extend and fillet, and six modify gestures — every one producing an expression, not a literal.
- CC-CAD1
- Dimensions, hatches and weld marks
- Linear, chain, ordinate and angular dimensions; ISO 128 hatches; ISO 2553 weld marks; the clearance stack a fall-arrest sheet draws.
- CC-FIG4
- The concrete section
- Faces, bars and links drawn from the section's own dimensions, hatched as the discipline hatches them.
- CC-FIG5
- Drawn once
- A definition is a routine. Place it by position, rotation and mirror; four starter profiles — CHS, RHS, UB and angle — parameterised by their dimensions.
- CC-FIG6
- Drafting furniture
- S-breaks, a north arrow, section and detail markers, and a scale bar whose words are derived from its own two points.
- CC-FIG7
- Layers
- A condition, a print flag, a default style and a lock per layer, so setting-out geometry can stay off paper.
- CC-CAD5
- DXF export
- The drawing the sheet computed, as R2000 DXF, from the figure's menu and from the standalone runner.
- CC-CAD6
- Charts
- Seven chart kinds in hand-rolled SVG, printed as vectors, with a table as a plot's input.
- CC-P4d
- Figure programs
- A drawing loop emits geometry from a program, so a pattern of n bolts is n, not a picture of six.
- CC-PF2
Parametric figures
The drawing redraws with the numbers. A section that reads at length once the figure block has been introduced.
LOOP-04
Animation off — showing the result.
04
Tabulate it
A table is a grid of expressions that carries units, publishes its columns as variables, and edits like a spreadsheet.
- Tables that compute
- Cell formulas, a format and a unit per column, a ✓/✗ column that checks itself, and columns that are document variables.
- CC-P4a
- Cell addresses and ranges
- A1-style references with $ pins, ranges, a formula bar that answers, coloured references, and a corner drag.
- CC-TBL13
- Lookups
- Bracketing and stepping lookups over a keyed column, with a typed refusal for a key off either end.
- CC-F1
- Data tables with global columns
- A schedule declared global is readable above and below itself, per column.
- CC-L46
- Typed columns
- Words, truth values and pasted values beside numbers, each column saying what it holds.
- CC-C3
- Schedules that drive instances
- A batch region drives one template sheet from a schedule's rows; the cover computes over every instance, and each prints.
- CC-BATCH2
- The STAAD bridge
- OpenSTAAD on your own Windows machine, through MCP. A landed table carries its origin stamp onto the issued page.
- CC-STAAD2
- Sized by the page
- Column widths as fractions of the content box, wrapped and hidden columns, and print parity for all of it.
- CC-TBL8b
Tables that compute
Every cell is an expression, every column carries a unit, and the utilisation column checks itself. Nine tables in this document; none of them is a picture.
LOOP-06
Animation off — showing the result.
05
Print it
The page you print is the page you wrote: one paginator, one title block and one sheet on screen, on paper and in the PDF.
- The page model
- A4, A3 and Letter, margins, explicit breaks, columns and section breaks, headers and footers edited on the page.
- CC-C5
- Title block and numbering
- A title-block template, page numbering, and a print preview that is the print.
- CC-P6
- The PDF
- Rendered on the server by driving the app's own print route, with the math font embedded and every figure a vector.
- CC-P6
- Print parity
- The canvas and the PDF agree about every page break; a zone's furniture stays off paper.
- CC-L11
- Placed PDFs
- A chosen PDF renders inside the calculation, on the paper it will print on, with pages, a margin and a border.
- CC-I1
- Projects and binders
- A binder refers to several sheets and attached PDFs, with a front page and a contents page whose rows and page numbers are derived.
- CC-PRJ4
- A binder reads its members
- A cover computes from what its members declare, with provenance chips on the canvas and a printed manifest.
- CC-XREF2
- Issue and revision
- An issued revision is locked in the database and on the wire, and its stamp prints on every page.
- CC-P6
Issue and revision
A sheet that is issued stops moving. It matters enormously to a buyer and not at all on a first visit.
LOOP-10
Animation off — showing the result.
06
Work together
Two people, one sheet, live — and the record it becomes.
- Live co-editing
- Yjs-native from the first line: presence, carets, per-character merges, every result recomputed on every machine.
- CC-P1d
- Comments and mentions
- Anchored to a region, resolved in place, with a notification for the person named.
- CC-P8
- Versions and a calc-aware diff
- A named snapshot, restored in one step, with a diff that knows which numbers moved.
- CC-P8
- Share and publish
- Roles, view-only links, and a published page that reads with no account.
- CC-P10d
- Standalone export
- One file, offline, still live: the engine and the sheet in a folder that opens from the filesystem, inputs working.
- CC-P10f-a
- The .sheaf file
- Save and open a calculation as a file; an assembly is a .sheafasm and a project a .sheafproj.
- CC-C5
- Offline drafts
- A local replica in the browser; a reconnect merges, and the status bar says which.
- CC-P9
- A blank sheet with no account
- The front door is a working sheet with the real engine. The account is the price of keeping the work, not of doing it.
- CC-P10g-b
One file, offline, still live
Send a calculation to somebody with no account and no network. The inputs still work.
LOOP-12
Animation off — showing the result.
07
Let it write
The Assistant writes a sheet from a description, extends or fills one you are editing, and reads the house's guide before it does.
- Describe it, get a sheet
- Say what you are checking; the sheet arrives written, evaluated, and open for editing.
- CC-P10i-a
- Every block family on the first turn
- Tables, figures, charts, controls, programs and solve blocks — not only mathematics — plus the paper size and the result display.
- CC-AS2
- The in-document panel
- Ask for a change to a region. Apply is one transaction on your own sheet; the server never writes a live document.
- CC-P10i-c
- The outline builder
- A brief per section, a saved outline that reopens as saved, and a sheet written from it in stages.
- CC-P10j-a
- Runs that outlive a tab
- A long generation runs on a worker; reload and the sheet is still being written.
- CC-P10j-k
- The house style and its guide
- An office's palette, paper and defaults, copied into a sheet at birth, and an authoring guide the Assistant reads on every ask.
- CC-HS4
- The MCP connector
- Validate, create, evaluate, render a PDF, edit, work with outlines and templates, and inspect the vocabulary through an approved MCP connection.
- CC-P10e
- Documentation and a function reference
- Walkthrough frames shot from the shipped components, and one page answering what every function takes, returns and refuses.
- CC-D5
Open a blank sheet and type.
No account until you want to keep it. The engine runs in your browser.
Open a blank sheet