I Built 3 Free Developer Tools as a Solo Dev — Here's What I Learned

I'm a solo developer from Seoul, and over the past few months I built ClickVolt — a URL safety scanner. But the tools I ended up using the most are the 3 free developer tools I added along the way. All of them are 100% free, no signup required, no usage limits. 1. Repo vs Repo — GitHub Repository Comparison → clickvolt.app/tools/compare Ever struggled to choose between two similar libraries? This tool lets you compare any two GitHub repos side by side. What it shows: Stars, forks, open issues, watchers Primary language, license Latest release version and date Average weekly commits (4-week and 12-week) 52-week commit activity chart I pre-loaded popular matchups like React vs Vue, Next.js vs Remix, Express vs Fastify, Prisma vs Drizzle ORM, and more. Why I built it: I kept opening two GitHub tabs and manually comparing numbers. Figured I'd automate it. 2. Repo Radar — Open Source Tool Explorer → clickvolt.app/tools/radar Browse popular open source tools across 20 categories : Frontend,