Free browser-only developer tools, nothing uploaded
Below is ~350, safely under.) RVUtils is a set of 13 developer tools that run entirely in your browser: JSON/XML formatter & validator, JWT decoder, Base64/URL encode-decode, regex tester, MD5/SHA/HMAC hashes, UUID v4/v7, color converter with WCAG contrast, and Unix/timezone converters. Nothing is ever uploaded - your data stays on your device. No sign-up, no ads, 7 languages.
A source that found nothing is a measurement. A source that has not run is a gap. Neither means the launch lacks the thing.