SumOffice editors
Documents and spreadsheets open where they live
SumDoc and SumSheet are our document and spreadsheet editors. Double-click a file in Layers Drive and it opens: formulas calculate and a spreadsheet saves back to the same file. The same editors come as desktop and mobile apps.
No card · free for up to 20 people
The pain
How most teams handle documents
Files back and forth
- ✗Download the contract, edit it, upload it again
- ✗Three copies in the folder: “final”, “final2”, “really final”
- ✗You need a desktop program to open the estimate
- ✗New spreadsheets get started somewhere else, then lost
SumOffice editors
Documents, spreadsheets and presentations
One engine, three editors. Documents and spreadsheets already open from Layers Drive; presentations are an early desktop version.
SumDoc — documents
Agreements and reports: headings with styles. Opens .docx in Layers.
SumSheet — spreadsheets
Estimates and calculations: formulas and totals recalculate on their own. Opens .xlsx in Layers.
SumSlide — presentations
An early version: a desktop app. Not yet built into Layers Drive.
01 · Open
A file opens where it lives
The editor comes to the file, not the file to the editor. Double-click in Drive and it is open. No downloading and uploading back.
SumDoc
An agreement in SumDoc with one double-click
“Harbor Clinics contract.docx” sits in Drive next to the estimate. Double-click and it opens in SumDoc: title and clauses, as in the file.
SumSheet
An estimate in SumSheet, the same way
Double-click “Estimate — Booking App.xlsx” and the workbook opens in SumSheet: phases, hours, rates, amounts and Total.
02 · Create
A new file without leaving Drive
Documents and spreadsheets start right where the rest of your team’s files live.
Create
A document or a spreadsheet from the Create menu
In Drive’s Create menu, next to Folder, are Document and Spreadsheet.
03 · Edit
Spreadsheets calculate, documents keep their styles
Formulas recalculate on their own, and headings rely on styles.
SumSheet
Change a number — the total follows
In the estimate, QA hours go from 60 to 80. The row amount becomes 3,200 and Total 35,720 as soon as you enter it.
Inside the editors
Styles and language
04 · Save
One file instead of three copies
“Opened” doesn’t mean “saved”. A spreadsheet edit goes back into the same Drive file — no downloading, no copies.
Saving
Saved — the same file is updated
In the estimate, Store release hours go from 16 to 24, then back to the folder in Drive: the same files, no copy. Open the estimate again — 24 is still there, Total 35,280.
05 · SumOffice numbers
Fidelity and speed in SumOffice numbers
These are SumOffice measurements from September 2026, not our test stand. Every number links to its source; compatibility is given as “N of M”, never a bare percentage.
Fidelity and compatibility
Speed
SumOffice keeps an open list of limitations at sumoffice.com/capabilities. Speed in the browser also depends on the editor server.
06 · Desktop and mobile
The same editors on desktop and mobile
SumDoc and SumSheet are free on the App Store, Google Play and the Mac App Store. Windows and Linux builds are on the SumOffice download page.
SumDoc
Documents
SumSheet
Spreadsheets
Mac builds are notarized by Apple. Windows installers are not yet signed with a trusted certificate, so SmartScreen will warn you; check the SHA-256 on the download page. Layers apps are on the Download page.
Cloud or your own server
Free for up to 20 people. Your own server when you want it
In the cloud: no card, no time limit. Need full control? Deploy Layers yourself: the same Drive, the same editors.
One workspace
The editors are part of Layers
Your data, your control
Which files open from Drive in an editor?
.docx in SumDoc, .xlsx in SumSheet. Drive previews other files or offers to download them.
Do I need to install anything?
Not in the browser: if the administrator has connected the editors, the file opens in a new tab. In the Layers app for Mac and Windows, .docx and .xlsx open in SumDoc and SumSheet on your computer — you can install them right from the app.
Are there mobile apps?
What about presentations?
SumSlide is an early version: a desktop app for macOS, Windows and Linux. It is not yet built into Layers Drive, and SumOffice makes no compatibility or speed claims for it yet.
Why is there no Document item in my Create menu?
The server administrator connects the editors by setting the SumDoc and SumSheet addresses. Until then, the menu only has Folder.
What if two people save a file at the same time?
The server won’t let an older version overwrite a newer one: that save is rejected.
Where do the compatibility and speed numbers come from?
They are SumOffice measurements from September 2026; every number on this page links to its source. We have not repeated them on our test stand.
Where can I learn more about SumDoc and SumSheet?
On sumoffice.com and docs.sumoffice.com.
The document opened. The formula recalculated. The file opened again.
Start free in the cloud or deploy Layers with the editors on your own server.
