# SumSheet XLSX Editor — Open and edit Excel workbooks

> Open and edit Excel workbooks (iPhone/iPad app by HEALTH INFORMATIC SECURITY SYSTEM, S.L..)

- Source: https://appshunter.io/ios/app/sumsheet-xlsx-editor/id6807049725 (this page in markdown: same URL + `.md`)
- Developer: [HEALTH INFORMATIC SECURITY SYSTEM, S.L.](https://appshunter.io/developer/1848342899)
- Category: Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 73 MB
- Languages: American English, Arabic, Russian
- Released: 2026-09-04
- Data updated: 2026-09-20
- User reviews in markdown: https://appshunter.io/ios/app/sumsheet-xlsx-editor/id6807049725/reviews.md

## What is SumSheet XLSX Editor?

SumSheet opens and edits Excel spreadsheets on your device.

Named after the most famous formula on the planet, SumSheet runs on the same native XLSX engine that powers SumOffice on the desktop and on the server — so a workbook calculates the same wherever you open it. Change a price and the total recalculates, exactly as it would on a laptop.

WHAT IT DOES
• Opens .xlsx, .xlsm, .xlsb, .xltx and .xltm — from the Files app, mail, or any app’s “Open in…”
• Edits cells in the formula bar and recalculates formulas — across sheets too
• 200 worksheet functions: math, text, dates, lookup, logical, financial, engineering
• Tables with filters, conditional formatting, number formats, charts — kept as in the file
• Keeps the workbook structure intact — sheets, formats, formulas, macros stay in the file

YOUR FILES STAY YOURS
Editing happens on the device. Workbooks are not uploaded anywhere, and the app does not require an account to open a file.

PART OF SUMOFFICE
SumOffice is an office suite built around one document engine: the same logic in a desktop application, inside your own product, on a server, and here on the phone. SumDoc is its document counterpart.

SumOffice is an independent product and is not affiliated with Microsoft.
Learn more: https://sumoffice.com


## Version history (last 5 releases)

### 2026.3.33 — 2026-09-19

Export all sheets to CSV (ZIP) from the File menu — every sheet as its own CSV with the values you see, packed into one archive.
Fixes and smaller improvements.

### 2026.3.32 — 2026-09-17

Built for the phone:
• Tap a selected cell again to type; the keyboard's Done commits the value.
• Home ribbon shows the real Font, Clipboard and Number controls — bold, size, colour, number format.
• Save As asks for a name and opens the Share sheet; Open… picks from Files; Share… sends the workbook anywhere.
• Close and Start screen return to the app's start screen, asking about unsaved edits first.
• Desktop-only items removed from the File menu.

### 2026.3.31 — 2026-09-16

• Tapping the formula bar no longer zooms the whole page on iPhone.
• Calculation engine and ribbon updated to the current desktop release.
• Fixes and polish.

### 2026.3.30 — 2026-09-10

• Open .xlsm, .xltx, .xltm and .xlsb from Files, Mail and other apps
• Opening a second workbook while one is open now works
• Switching sheets no longer hangs on “Opening”
• Row heights and sheet names shown exactly as in the file
• Page numbers and the editor ribbon follow the device language
• Faster first open of large workbooks

### 2026.3.28 — 2026-09-09

Version numbering now matches the desktop build: year.quarter.patch.

Formulas are recalculated when a workbook is opened and when you type, so files written by other tools show their totals right away.

The loading screen and the save dialog now follow your device language.

## More apps by HEALTH INFORMATIC SECURITY SYSTEM, S.L.

- [LayersAll](https://appshunter.io/ios/app/layersall/id6773373635)
- [SumDoc — DOCX Document Editor](https://appshunter.io/ios/app/sumdoc-docx-document-editor/id6807049845)

All apps by HEALTH INFORMATIC SECURITY SYSTEM, S.L.: https://appshunter.io/developer/1848342899

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-20.*