What's New in SpreadJS v18.1

Pittsburgh, PA – May 15^th, 2025 MESCIUS USA, Inc., a global provider of award-winning enterprise software development tools, is pleased to announce the SpreadJS v18.1 release. The highlights of SpreadJS v18.1 include workbook and calculation engine enhancements, updates to the designer ribbon add-on component, and two new previews for upcoming add-on components. SpreadJS v18.1 is now available as an upgrade for existing customers and a download for new customers on the MESCIUS website.

SpreadJS v18.1 allows users to add a full-sheet image for branding, watermarking, or instructional overlays. These backgrounds maintain performance and are visually responsive across zoom levels. With new TRIMRANGE and REGEX functions in the calculation engine, Excel-compatible functions enable cleaner and smarter data handling. Read the release announcement to learn more about the workbook and calculation engine enhancements in SpreadJS v18.1.

The team has significantly reduced the size of the Designer Component add-on itself, achieving a 30% or more reduction in the JavaScript and CSS file size. This improvement comes from careful refactoring and optimization of the Designer Component codebase, leading to faster load times and improved performance across web applications. The Designer’s dockable side panel enhances user experience and efficiency. It allows users to flexibly adjust the panel position based on personal preferences or workflow needs, optimizing screen space while keeping the design viewport unobstructed. Visit the website to learn more about the new designer component enhancements in SpreadJS v18.1.

The SpreadJS v18.1 release introduces two new optional add-on previews. The AI beta component brings natural language intelligence to JavaScript spreadsheets, allowing developers to instantly generate formulas, create PivotTables, and analyze data using simple text prompts—all without writing complex code. The Collaboration Add-On is a server-side component that facilitates real-time collaboration and editing within a SpreadJS workbook. It enables developers to implement features like auto-saving and version control to help create their proprietary collaboration platforms. Learn more about SpreadJS’s upcoming add-on components in the release blog.

“With the release of  SpreadJS v18.1, we're delivering significant advancements for JavaScript developers,” said Product Manager Donald Williamson. “SpreadJS adds new PivotTable enhancements, more Excel-compatible features, and a powerful AI Add-on Preview, enabling natural language interaction and intelligent automation within JavaScript spreadsheets. These updates empower developers to build more intelligent, efficient, and visually rich applications across platforms.”

About MESCIUS USA, Inc.: MESCIUS USA, Inc. is one of the world's largest providers of developer components. The company retains 400 employees and hundreds of thousands of customers worldwide. MESCIUS is committed to providing enterprises around the world with state-of-the-art developer tools and components, software services, and solutions. For more information, visit https://developer.mescius.com.

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