The everyday utilities, in one place
The grab-bag: a regex tester with live match groups, a cron expression explained in English with its next run times, chmod bits you can toggle, base and unit conversions, an ASCII table you do not have to search for.
These are the tools you open ten times a day and close again in twenty seconds, so they load fast and work offline once the page has been visited.
16 Developer Utilities tools
Test JavaScript regular expressions against sample text with live matches, groups and replace.
Inspect each character: code point, UTF-8/UTF-16 bytes and HTML entity, locally.
Paste anything, it detects the format (JWT, JSON, SQL, XML…) and sends it to the right tool.
Convert integers between hex, decimal, binary, octal and any base (2–36), locally.
Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine, locally.
Toggle Unix read/write/execute bits and get the octal and symbolic chmod, locally.
Convert a `docker run` command into a docker-compose service definition, locally.
Percent of a value, what-percent-of, and percentage change — all in one, locally.
Estimate how long a task takes and when it finishes from a measured rate, locally.
Compare timing samples across suites by mean and variance, then export the results, locally.