Apps

Building the tools that web analytics and CRO work actually needs.

If the right tool doesn't exist, I build it. A growing set of utilities born from real work in marketing and web analytics.

GA4 / Web AnalysisAB Test

Regify

Automatically generates the URL regular expressions needed for GA4 and A/B testing tool configuration — just type the URL. Handles URLs with or without parameters, and lets you verify against test cases, all in one screen.

GA4 Setup

Instantly generate regex for filter and goal URL settings

A/B Testing

Validate targeting URL configurations

GTM Setup

Use for trigger URL condition settings

Japanese / English · GitHub Pages

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Data AnalysisSecurity

SheetSafe

Many CSV-to-Excel web services leave you wondering how your uploaded data is handled, so I built a tool that converts everything right in your browser — no files are ever sent externally. Just drag and drop a CSV (or select one) to convert it to XLSX, with support for UTF-8, Shift_JIS, and EUC-JP encoding.

Batch Convert

Convert multiple CSV files to Excel at once

Data Analysis

Streamlines analysis in Excel and Google Sheets

Security

Conversion runs entirely in your browser — files are never sent externally

Runs entirely in-browser · GitHub Pages

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Coming Soon

Next tool in development

Why I build tools

In web analytics and CRO work, there are surprisingly few tools for the things you actually need. Regify is a perfect example — every GA4 setup involved the same repetitive task, so I built something to speed it up. SheetSafe came from the same kind of frustration: most CSV-to-Excel web services require uploading your file to a server, which left me uneasy about how that data was handled. Turning real problems from the field into tools is where my development work starts.