SumOffice is an independent office platform that embeds into your product, under its name and inside its perimeter. SumDoc works with Word documents, SumSheet with Excel spreadsheets; the platform is not tied to Microsoft — how to move away from it without losing files.

Verified against the code and the delivery

How this is proven

Every number is taken from installed builds and checked against the source code and the delivery on every site release. If even one diverges, the site is not published.

41document session commands — all accepted by the release core

208spreadsheet contract operations, 206 of them accepted by the core of the latest release

13spreadsheet formats, including XLSX, XLSB, XLSM, ODS and CSV

1 000 000rows open in the browser — scroll and see the cost of a frame

1–3 sa two-page memo on screen in the browser; a 24-page draft with tracked changes—3–4 s. Measured on September 5, 2026 on a production node, clean profile—open it and time it

33 MB29 pages, 37 photos—a real government agency report opened by the same core; alongside it three more real DOCX files, up to 42 photos—files and live sandboxes

Live editors · no install

Try it right here

SumDoc · DOCXA document in SumDocA two-page contract. Edit a paragraph and see what it looks like inside a third-party application.Open the live editorSumSheet · XLSXAn estimate in SumSheetA spreadsheet with formulas. Change a quantity or a price — the totals recalculate on their own.Open the live spreadsheet

Two products · one embedding model

Two engines, one embedding model

SumDoc · Word documentsDocument editorOpens a Word file, shows the pages, lets you edit and saves — inside your window. Your application drives it through 41 commands, and there is no other path to the document.SumDoc overviewQuick startReference

SumSheet · Excel spreadsheetsSpreadsheet editorFormulas, edit history, large workbooks. One set of operations on the desktop, in the browser and on the server: 208 operations are described, 206 of them accepted by the core of the latest release.SumSheet overviewQuick startReference

The third engine—for presentations—is in development: a public beta is planned for December 2026; it cannot be downloaded yet, and PPTX compatibility, platforms, and speed are not promised.

Three paths · step by step

Where to start

BrowserInto a web applicationThe editor opens on your page; the file stays within your perimeter.Four stepsWindows · macOS · LinuxInto a desktop applicationThe editor runs alongside your program, and the program knows about every change.Three stepsiOS · AndroidInto a mobile applicationReady-made apps in the stores, a viewer kit and a path for editing from a phone.The working path

The buttons at the top of the page serve builds for macOS, Windows and Linux — for your system and architecture. Windows and macOS come in both, x64 and arm64. What to do after downloading — install SumDoc and install SumSheet. If you would rather not figure it out — hand the task to Claude.

Twenty-four projects · file by file

Code examples

• Live SumDoc example: the editor in the browsera working document editor right on the page, and the whole project that connects it
• Minimal sheethow many lines it takes to get a working sheet
• Embedding into a third-party pagewhat happens to the host page around the sheet: its font, background and scrolling
• A million rowsthe cost of three gestures on a workbook at the limit — scrolling, fill-dragging and zooming: p50 and p95 frame times and calls to the core as numbers, not promises
• Two people in one documenttwo frames side by side: move the selection in one and the other shows the remote cursor with a name; the screen says plainly that only windows of this browser are visible
• Headlessa workbook is opened, edited and read from Node — without a single call to the DOM

All SumSheet examplesSumDoc examples

Where to go next

What you getWhat you bring, what the platform does, what you getPilot and acceptanceA two-week plan and the criteria for a go / no-go decisionAI tools and MCPConnect the documentation to Claude, Cursor or ChatGPTContact usRequest a pilot, join the beta or ask a question