About RINEARN
RINEARN is a Japan-based software development studio with over 20 years of experience as an independent developer.
We originally focused on data analysis and visualization, but we have since expanded into more general software and system development, website creation and operation, and AI-related solutions.
If you have something else in mind as well, please feel free to reach out — we're happy to consider a wide range of requests with the agility of a small independent studio.
» Technologies We Can Provide
Representative
Fumihiro Matsui
* Applied Information Technology Engineer (Japanese National Qualification), Ph.D. in Science (Physics)
» Greeting from the Representative
Business Type
Sole Proprietorship (Business name: RINEARN)
Business Activities
Primarily working as a subcontractor and freelance engineer:
Contracted software development, various outsourcing/support services for development and analysis, and customization/support for existing software.
Contribution Activities (Freeware, etc.)
RINEARN has developed and publicly released several pieces of freeware, including RINEARN Graph 3D, with a primary focus on analysis. These programs are offered as a way of giving back for the many free software and libraries that the representative relied on during his student years for analysis and computation. Feel free to use them as you like.
Location
Kyoto, Japan
Contact Us
» Please visit our contact page.
We also welcome your feedback and comments on our free software. Don’t hesitate to reach out if you have any questions.
History
RINEARN was established in 2009 as a distribution site for self-developed freeware. In 2018, it officially launched as a sole proprietorship studio, starting contracted software development and various outsourcing/support services.
Media Appearances
- Vector Software News (June 10, 2010, Web media)
- Monthly Mr.PC September 2010 Issue (July 24, 2010, Magazine in Japan)
- Monthly Mr.PC June 2011 Issue (April 24, 2011, Magazine in Japan)
- Free-Soft-no-Dendou (July 15, 2011, Mook magazine in Japan)
- Vector Software News (July 30, 2014, Web media)
News
Exevalator v2.4 Released — MCP Support Added, Now Usable as an AI Calculation Tool
2025-11-15 -
We've released Exevalator v2.4, our expression-evaluation library. Starting with this version, it supports MCP, making it usable as a calculation tool for AI assistants.
Exevalator v2.3 Released — Now Usable from Python
2025-11-04 -
We've released Exevalator v2.3. Starting with this version, you can now use it from Python! With growing demand around AI tool development in mind, we share the details here.
Exevalator Updated — Easy Japanese Localization for Error Messages
2025-10-31 -
Exevalator 2.2.2 is out. You can now localize error messages to Japanese with a simple copy-and-paste, and we've included several bug fixes and minor parser adjustments.
Inside RINPn Online: Architecture Overview
2025-10-22 -
An inside look at the architecture of the recently launched online version of the RINPn scientific calculator. It's open source, so you can freely modify and reuse it to build your own web calculator (maybe!).
Meet RINPn Online: Use the Scientific Calculator Anywhere, Instantly
2025-10-21 -
RINPn, the free scientific calculator, now has an online version you can use instantly in your browser — on both PC and smartphones. Read the announcement for details.
The VCSSL Support AI is Here! — Requires a ChatGPT Plus Account for Practical Performance
2025-08-19 -
A new AI assistant for the VCSSL programming language is here to answer your questions and help with coding. This article explains how to use it and showcases plenty of real Q&A and generated code examples.
English Documentation for Our Software and VCSSL Is Now Nearly Complete
2025-06-30 -
We're happy to announce that the large-scale expansion of our English documentation with the support of AI — a project that began two years ago — has now reached its initial target milestone.
VCSSL 3.4.52 Released: Enhanced Integration with External Programs and More
2025-05-25 -
This update introduces enhancements to the external program integration features (e.g., for running C-language executables). Several other improvements and fixes are also included. Details inside.
Released: Latest Version of VCSSL with Fixes for Behavioral Changes on Java 24
2025-04-22 -
VCSSL 3.4.50 released with a fix for a subtle behavioral change in absolute path resolution on network drives, introduced in Java 24. Details inside.
Released the Latest Versions of RINEARN Graph and VCSSL - Now Supporting Customizable Tick Positions and Labels!
2024-11-24 -
Starting with this update, a new "MANUAL" tick mode is now supported, allowing users to freely specify the positions and labels of ticks on the graph. We'll explain the details and how to use it.