I built a free online toolbox with 260+ tools — here's the tech stack and what I learned

Short summary

Anirudha Sonwane built ToolReign, a free browser-based toolbox with 260+ utilities (JSON tools, PDF handlers, India-specific finance calculators). Built with Next.js App Router using static export for privacy—all processing happens client-side. Key learnings: registry-driven architecture scales without hand-maintaining URLs, India-specific localization (GST splits, HRA rules) outperforms generic global tools.

• •Built a 260+ tool platform using Next.js App Router static export with registry-driven architecture for scale without hand-maintenance
• •All processing in browser using Canvas and Web Audio APIs with pdf-lib for privacy without requiring backend infrastructure
• •India-specific finance tools with en_IN localization (GST, HRA, EMI, SIP) matched local search intent better than generic global competitors

Generated with AI, which can make mistakes.