Modern Excel Compatibility, Fidelity, and Performance
Keikai 7 introduces a next-generation spreadsheet core with improved formula compatibility, chart fidelity, faster editing performance, and support for modern Excel behaviors.
Rather than changing existing frontend workflows, Keikai 7 focuses on resolving practical compatibility and fidelity limitations that enterprise users commonly encounter when working with modern Excel files.
Support for 50+ new formulas including dynamic arrays, LAMBDA, and the latest Excel additions.
Preserve spreadsheet visuals more accurately during import and export.
Faster loading, saving, and bulk operations on large workbooks.
Key improvements in compatibility and spreadsheet behavior.
| Capability | Previous Version | Keikai 7 | Enterprise Value |
|---|---|---|---|
| Formula Support | 400+ built-in formulas | 503 formulas - 50+ new including LAMBDA family, GROUPBY, PIVOTBY, and dynamic arrays | Handles a wider range of modern Excel workbooks |
| Dynamic Arrays | Standard formula support | Adds the Excel 365 dynamic array, lookup, and LAMBDA function family — FILTER(), UNIQUE(), XLOOKUP(), LET(), LAMBDA(), and more | Enables modern Excel modeling workflows |
| Visual Fidelity | Solid chart and layout rendering for standard use cases | Enhanced chart fill and border rendering | Better presentation consistency |
| Workbook Performance | Reliable editing experience for typical spreadsheet use | Up to ~7× faster file open, ~3× faster save, ~6× faster bulk updates; more responsive typing | Faster load times and smoother interactive workflows |
| Platform Foundation | Proven, stable architecture widely used in production | Next-generation spreadsheet core built for modern Excel behaviors | Stronger foundation for future extensibility |
Most applications need no code changes — bump the Keikai version and the native engine arrives automatically as a transitive dependency. The APIs you already use (io.keikai.api.*, io.keikai.ui.*, the Spreadsheet ZUL widget) are unchanged. Two requirements apply to every upgrade: Java 17 or later, and a supported server platform.
Migration adjustments may be needed if your application:
org.apache.poi.* classes to plug into Keikai (custom formula functions)PdfExporter programmatically (paper size, margins, per-sheet export)If any of these apply, our team can help evaluate compatibility and walk through the migration path.
Keikai 7 introduces a modernized spreadsheet core designed to better support evolving Excel behaviors and future enterprise spreadsheet features.
