What's New in SpreadsheetWeb - October 2026

The October 2026 release brings three significant additions to SpreadsheetWeb: a Design Library for building an application from a complete visual starting point, support for Excel’s new in-cell arrays, and SEO settings for public applications. Together, they help teams move from workbook to finished app, carry a new Excel capability into a web app, and present a published app more clearly to prospective users.

Following September’s Designer refresh, this release also expands page design, application themes, and Simple Label content. Here are the highlights of version 26.10.0.

Start With a Complete Design

The new Design Library gives you more than an empty canvas. You can browse 70 multi-page flows, 144 individual pages, and 243 reusable components, search by purpose, and preview a design at desktop, tablet, and phone sizes before adding it to an application.

Choose a complete journey when you want a coordinated starting point, or add a page or smaller group of controls where it fits your existing layout. During import, you can decide where new pages belong and whether to apply the design’s suggested theme, fonts, and background. You do not have to connect every imported control to the workbook before continuing.

Workbook Connections provides a guided way to finish those bindings. It highlights a control on the canvas, keeps its properties in view, and lets you move through the remaining items across pages. You can leave the guide to edit surrounding content and return later from Page overview. If you choose to retain sample values in imported labels, they remain visibly marked until you replace them with workbook values; that option is off by default.

The Designer’s Pages drawer now keeps more of this work beside the canvas. Create, duplicate, reorder, or remove pages; choose a home page; and adjust width and spacing without leaving the design context. You can start a new page blank or with a library design.

To explore the library, open Layout & Controls and select Design library from Page overview. Use Add component for a reusable section.

Bring Excel’s New In-Cell Arrays Into Your Applications

Microsoft has introduced lists, arrays in cells, and nested arrays: a new Excel capability that lets a single cell hold multiple distinct values. It is currently rolling out to Microsoft 365 Insider Beta Channel users. Microsoft’s announcement explains the feature and its beta availability.

SpreadsheetWeb 26.10.0 implements support for this new Excel feature. Its calculation engine can read supported in-cell array values, including nested structures, and work with the new FLATTEN, HAS, HASALL, and HASANY functions. Array handling has also expanded across lookup, text, date, financial, logical, and other formula families. The accompanying demonstration shows a workbook using these values and the resulting dashboard in a SpreadsheetWeb application.

This is support for the new capability, not a claim that every beta workbook or formula combination is compatible. As with any workbook-based app, test the calculations and outputs that matter to your use case before publishing.

There is no Designer switch to enable this improvement. It applies when a supported Excel workbook is loaded and calculated.

Shape How Public Apps Appear in Search

Public applications now have SEO settings for their page title, description, social-preview information, and indexing preferences. A preview lets you review how the information may appear before publishing. Optional AI suggestions can help draft a title or description, but you review the context shared with that feature and control the final wording.

These settings change the metadata of a public application, not who is allowed to open it. After updating the settings, publish the draft to update the live metadata. Search engines still decide whether and when a page is crawled and indexed, so an indexing preference is not a promise of placement in search results.

When SEO is available for your application, open Settings in Designer and find SEO.

More Ways to Refine the Experience

The October release also brings improvements throughout application design:

• Application appearance: A single theme dialog brings colors, Default/Light/Dark modes, backgrounds, fonts, text size, and chart and input defaults together. The background gallery includes 25 still and 25 animated designs; animated artwork runs on eligible paid plans, while other workspaces receive a still version. Reduced-motion preferences pause animation automatically.
• Navigation and pages: Coordinated navigation, loading screens, wizard trackers, and page-transition previews help create a consistent journey. You can retain the instant transition or choose from 20 animated presets, with reduced-motion preferences respected.
• Simple Labels: Collapsible disclosures, styled tables, tables of contents with optional completion tracking, image framing, and new inline emphasis treatments make longer content easier to structure and scan.
• Reliability: Fixes cover shared-formula calculations, uploaded-file retention through repeated saves, dropdown initialization, workbook references, Designer editing, charts, grids, and application startup behavior.

Full Release Notes

Version 26.10.0 is about giving applications a stronger visual starting point, carrying more Excel behavior into the web, and giving public apps clearer search and social metadata. For the complete list of features, smaller improvements, and fixes, read the SpreadsheetWeb build notes.

As always, we welcome your feedback. If you would like help trying these capabilities in your own application, contact our team.