Plexto

Plexto is a free toolbox of 251+ online tools — JSON formatters, image/PDF converters, calculators, AI writers, live market trackers, security tools, and more. No signup, no usage caps, just open a tool and use it. Built it solo, tool by tool, mostly using Claude Code (Anthropic's AI coding agent) to write and ship each one — realistically, the only way one person builds and maintains 250+ tools. Stack: Next.js 16, MongoDB, Tailwind CSS, deployed on Vercel. Currently focused on getting more traffic to it — it's a brand-new domain in a crowded space, so backlinks and directory listings (like this one) matter more right now than adding more tools yet.