This page contains the technical changelog for the uCalc SDK. For a high-level overview of major new features, please see What's New.

Upgrading from a legacy version? Because of the massive architectural improvements made in recent years, the release notes is starting with a clean slate, instead of listing every change since old versions.

Current Status & Roadmap

The uCalc SDK has been successfully packaged for modern cross-platform environments. This Developer Preview allows you to evaluate the engine's token-aware architecture, explore the interactive documentation, and integrate early before General Availability (GA).

While the core logic relies on decades of mature development, this preview is a transitional build. To set proper expectations for production use, please note the current development roadmap:

• Performance Optimization: The Math Parser successfully targets modern compilers, but needs to undergo heavy re-optimization to match or exceed the extreme execution speeds of its legacy predecessors.

• Structural Refinement & API Stability: The Text Transformer is slated for a clean structural rewrite under the hood to bypass current limitations and natively support advanced Language Building capabilities. Additionally, the uCalc String Library is currently still in its active design phase. Expect notable breaking API changes, especially in the String Library, as final architectures are locked in.

Release Notes

5.7.1-preview.1 September 9, 2026

🛠️ Improvements & Refinements

• The {@File} pattern method and File() and FileSize() functions now work across platforms (was previously implemented for Windows only). Access restrictions to these will be configurable in a later update.
• Additional configuration constants were added; config constants are now documented.

5.7.1-preview.0 September 6, 2026

🛠️ Improvements & Refinements

• Changed the wording for the preview warning and added more context further down in the README.

5.7.0-preview.9 August 30, 2026

🛠️ Improvements & Refinements

• Added lcm() function (Least Common Multiple)

5.7.0-preview.8 August 28, 2026

🛠️ Improvements & Refinements

• The following optional parameters were added to TraceTransform(): separator, format, elementVarName, indexVarName, and stepCountVarName.

5.7.0-preview.7 August 26, 2026

🛠️ Improvements & Refinements

• Added gcd() function (Greatest Common Divisor)

5.7.0-preview.6 August 23, 2026

🛠️ Improvements & Refinements

• Fixed incorrect placement of markdown closing markers in examples for the C++ NuGet README
• Removed elements not meant to show in the NuGet README examples (both .net and C++)
• Added separate links for C++ and .NET packages in the NuGet README

5.7.0-preview.5 August 21, 2026

🛠️ Improvements & Refinements

• Embedded release notes into the NuGet package
• The README for the uCalc SDK for C++ NuGet package has examples in C++ instead of C#
• Fixed: code snippet display in the Remarks section of the documentation
• Fixed: StringRepeat crash that happened with negative value (Ex: "'a' * -1")
• Added "Invalid operation" error, distinct from "Invalid floating point operation"

5.7.0-preview.4 August 19, 2026

🛠️ Improvements & Refinements

• Equation solver example added to NuGet README file and online documentation.

5.7.0-preview.3 August 14, 2026

🛠️ Improvements & Refinements

• Hyphens mistakenly included in NuGet package tags as space substitute removed.
• Some documentation dead links fixed.
• Documentation page template restructured in more SEO-friendly way
• More accurate display of doc page change and sdk version timestamps

5.7.0-preview.2 August 7, 2026

🛠️ Improvements & Refinements

• Improved clarity for the NuGet package title, description, README, tags.

5.7.0-preview.1 July 29, 2026

🚀 Major Features & Additions

Major relaunch of uCalc with smarter functionality and extensive documentation, including 600+ interactive online examples, and AI assistant.

🛠️ Improvements & Refinements

🐛 Bug Fixes

⚠️ Deprecations & Breaking Changes