Health Informatic Security System, S.L. · Málaga, Spain

The company behind SumOffice.

Health Informatic Security System, S.L. (HISS) is a software company in Málaga, Spain. We make two products: SumOffice — SumDoc for documents, SumSheet for spreadsheets and SumSlide for presentations, one engine that opens any file in 0.11 s, keeps your macros and Power Query running without Excel and lets an AI agent work inside the editor — and Layers, a team workspace with tasks, docs, chat, calls, calendar, mail, files and the same editors in one window. Designed and developed in the European Union.

Go to sumoffice.com Download the apps Try it in a browser

What we make

0.11 s to open a file

Opens any file in 0.11 s. One engine under documents, spreadsheets and presentations — for web, desktop, mobile and server-side. Real SumDoc, SumSheet and SumSlide run in your browser with no install and no sign-up: open one and count.

VBA · Power Query without Excel

Your macros and queries keep working. Formulas, macros, Power Query, events, form controls — SumOffice opens the workbook, runs it, changes it and saves it back, without Excel. A macro runs on a copy, and nothing is written until a person presses Apply.

✦ Agent inside the editor

Agents are already in the editor. The agent reads the document with its macros and queries, prepares the change on a copy and shows before and after — nothing in the document changes until you press Apply. Your own agent can connect over MCP.

Made in the European Union. A Spanish company registered in Málaga; the online check service runs in Frankfurt, Germany. SumDoc, SumSheet and SumSlide process your files on your own device; the free web tools delete uploads after 24 hours.

Products

01 · office engineSumOffice — SumDoc, SumSheet & SumSlideDocuments, spreadsheets and presentations on one engine: any file opened in 0.11 s, macros and Power Query without Excel, an agent inside the editor. Desktop apps for macOS, Windows and Linux; SumDoc and SumSheet for iOS, Android and macOS in the stores; editors in the browser and as a server; a library for Python, Node.js, .NET and Java; a mobile SDK for your own app.sumoffice.com → 02 · presentationsSumSlideThe third editor, for presentations (.pptx): open, edit, save. Desktop apps for macOS, Windows and Linux, straight from the release pipeline with checksums; a sample presentation in a live browser cabin; a mobile SDK for Android and iOS.Download SumSlide → 03 · team workspaceLayersTasks, docs, chat, calls, calendar, mail, files and editors — SumDoc, SumSheet and SumSlide — with one sign-in for the whole team. A call gets a short recap, the key decisions, a list of tasks and a transcript. In the cloud at layers.md or on your own server; apps for Mac, Windows, Linux, iPhone and Android.layers.md →

Company

Legal name	HEALTH INFORMATIC SECURITY SYSTEM, S.L.
Registered office	Av. Cibeles 1, Floor 9, CP 29014, Málaga, Spain
Tax ID	ESB86739125
Products	SumOffice — SumDoc, SumSheet, SumSlide, the SumOffice engines, libraries and mobile SDK · Layers — team workspace (layers.md, self-hosted node, apps for Mac, Windows, Linux, iPhone and Android)
Contact	sumoffice.com/contact
Legal	Legal & trademarks · App privacy · Licensing

SumOffice, SumDoc and SumSheet are trademarks of HISS. SumOffice is an independent product, not affiliated with or endorsed by Microsoft. Microsoft, Excel, Word, VBA and Power Query are trademarks of their respective owners, used here only to describe compatibility.