7 new tools: business days, bill splitter, vertical text and more

What's new in v1.6.0

Business tools

• Business Days Calculator (Japan) — count business days excluding weekends and Japanese holidays
• UTM Builder — build campaign URLs for Google Analytics, with presets
• Kanji Number Converter — convert numbers to formal kanji numerals for receipts and contracts

Utilities & text

• Bill Splitter — split bills with rounding and organizer adjustment
• Vertical Text Converter — Japanese vertical writing for social posts

Developer tools

• Markdown Table Generator — build tables visually
• PX ⇔ REM Converter — CSS unit conversion with a reference table

We also added a "New tools" section to the home page. All free, no sign-up required.