Take it and try it.
Start with nothing to install at all, then take a binary, then take the whole engine. Each step below is exactly as available as it says.
Nothing to install — open a document now
The real editor, in your browser, on real published files: eight demo cabins are open right now. Your edits live inside the cabin and are not saved anywhere.
Open a document in the browser →A working draft with comments and tracked changes. Measured on the live node on 5 September: a plain brief appears in one to three seconds, a 24-page draft with tracked changes in three to four. The 32-page illustrated annual reports on the front page take longer still. The number here is what we measure, not what we hope.
Three free tools on the same engines, no account: Word to PDF — a real PDF from a .docx, .doc or .odt in seconds — Open a Word file online — the document as pages in your browser, with a link to share for 24 hours — and XLSX to CSV — every sheet as CSV, values not formulas.
One binary — turn a DOCX into a page
sumdoc renders a Word file into a self-contained HTML page that opens with a double-click: offline, view-only, and honest about anything it didn't draw. Today the viewer can draw fewer pages than the layout has on long text without page breaks (a4#3138); the online tool then gives you the full PDF and says so.
curl -LO https://sumoffice.com/dl/sumdoc && chmod +x sumdoc
./sumdoc render report.docx -o report.htmlmacOS, Apple silicon · 144 MB · sha256 · Linux and Windows builds are next
The mobile apps
SumDoc and SumSheet for iPhone and iPad are live: SumDoc on the App Store · SumSheet on the App Store. For Android: SumDoc on Google Play · SumSheet on Google Play. For macOS: SumDoc on the Mac App Store · SumSheet on the Mac App Store — live since 9 September 2026; the same apps are also below as direct downloads.
The desktop apps — Linux, macOS, Windows
Straight from the release pipeline, signed, with checksums. The buttons below always point at the latest published version; the version number and file size are read live from latest.json, so what you see is what you get.
SumSheet — loading…
Checksums and the signing key are next to every version: SHA256SUMS.
SumDoc — loading…
Signed and notarized builds under the SumDoc name — from the same release pipeline as SumSheet.
Checksums and the signing key are next to every version: SHA256SUMS.
SumPoint — planned: public beta, December 2026
Presentations — the third editor, in development. Nothing is published for any platform yet, so every button below is off. A working preview recorded from the current build is on the front page.
Planned — public beta, December 2026. No version, no checksums and no signing key to verify until then.
Verify what you install
Builds are code-signed by Health Informatic Security System, S.L. Check the signature in the installer's properties before running — if it doesn't name us, it isn't ours.