Last year I started building small browser-based utilities: a JSON formatter, a regex tester, a color palette generator, an image compressor. No backend, no signup, just a page that does one thing well. Eight months later there are 59 tools at tooly.
Source: [Dev.to](https://dev.to/niber_ce2e99945f8c9a6a605/i-built-53-free-browser-tools-heres-what-i-learned-about-what-developers-actually-use-1aa1)