Nextcloud announced Nextcloud Spreadsheet on 26 October. The opening sentence is the useful summary: it is “a collaborative spreadsheet editor that runs on infrastructure you choose, whether it’s your own server or that of a trusted provider. It’s open source, opens and saves both XLSX and ODS files, and lets your team edit the same sheet together in real time.”

Two things are worth saying before the features. This is an announcement, not a release note: there is no version number, no changelog and no package to install at the end of it. And “open source” is Nextcloud’s own description; the announcement names no licence and links no repository, so this piece repeats the claim rather than verifying it.

What it does

For a spreadsheet, the list matters more than the framing. Nextcloud says the editor gives “access to thousands of functions and formulas for analyzing data and running precise calculations”, plus sorting and filtering of large datasets, macros and charts. Collaboration includes real-time co-editing with each person’s cursor visible, comments attached to the exact cell they refer to, and autosave: “Changes are saved automatically, and version history lets you restore a sheet as it was before someone overwrote a formula.”

Sharing goes further than a single sheet. You can give “one person read-only access and another editing rights, and require a one-time password to open a share”, and permissions are granular across viewing, commenting and editing. Federation is the unusual item: “Thanks to its federated nature, teams on separate Nextcloud servers, such as subsidiaries or partner organizations, can work on the same spreadsheet.” That is a real differentiator against a hosted service, if your organisation has more than one instance.

File formats are XLSX, XLS and ODS, which covers the two that matter for exchange with Microsoft Office and LibreOffice users. There is a browser editor, a “dedicated mobile view”, and desktop clients for Linux, macOS and Windows with offline editing.

What it sits on

Nextcloud Spreadsheet is part of Nextcloud Office, and the Office product page has changed its own description. Its title now reads “Nextcloud Office powered by Euro-Office”, and the page says: “Based on Euro-Office and its client-centric architecture, this powerful office suite includes collaborative editors for text documents, spreadsheets, presentations, and PDFs and is highly compatible with Microsoft file formats.”

The same page does not present Euro-Office as a replacement for what came before. It says Euro-Office “is available alongside Collabora Online in the latest Nextcloud versions, starting with Nextcloud Hub 26 Spring”, and it describes Collabora Online separately as “Built on LibreOffice technology”, prioritising “Open Document Format (ODF) fidelity and low infrastructure overhead” with processing “handled primarily on the server”. Both are listed as collaboration paths. So the honest reading is that Nextcloud now ships two office stacks side by side, and that the spreadsheet editor sits in the Euro-Office one.

The desk covered Hub 26 when it shipped as Server 35.0.0 in September, and a Euro-Office desktop client was already part of that release. This announcement puts the spreadsheet editor on the same trajectory.

What the comparison table is

The post includes a table comparing Nextcloud Spreadsheet with Microsoft Excel and Google Sheets. Read it as the vendor’s comparison, not a neutral test: the rows are Nextcloud’s own claims about its product, and the competitor columns are Nextcloud’s summary of theirs.

The rows it fills are these, in the table’s own order: open source status, answered “Yes”, “No”, “No”; where your data is stored, “Your server or a provider you choose” against Microsoft’s cloud and Google’s cloud; real-time co-editing; XLSX support; ODS support; mobile editing on iOS and Android; desktop apps for Windows, macOS and Linux; offline editing “with the desktop app”; an AI assistant row, “Nextcloud Assistant, runs where you choose”; and cost, “Free to self-host; Enterprise plans available”.

Two of those rows are not capability claims at all, namely the licence and the data location, and they are the two where the table most favours Nextcloud. The rest compare features, and none of them carries a benchmark, a fidelity score or a speed figure.

What the announcement does not say

Three practical questions are unanswered in the sources. Whether an existing Nextcloud Office or Collabora deployment gets Spreadsheet automatically, or whether it is a separate app or container to install, is not stated. Pricing beyond “free to self-host” with Enterprise plans is not itemised. And the licence question stays as Nextcloud phrased it.

If you already run Nextcloud Office with Collabora, the thing to do is ask those questions of Nextcloud’s documentation before planning anything, because the announcement is written for people choosing a platform rather than for people upgrading one.

Who it is for

For a team already inside Nextcloud, a spreadsheet editor that keeps files in the same place as documents and talk is a smaller change than adding another SaaS tool, and XLSX round-trip is the feature that decides whether it survives contact with colleagues who use Excel. The offline desktop clients and the federated editing are the two capabilities that a Google Sheets comparison cannot match for structural reasons.

For everyone else, this is a product launch with the details still to come: an announcement, another editor in a suite that already had Write and Present, and no version number to install yet.

Sources: the Nextcloud Spreadsheet announcement and the Nextcloud Office product page.