Coder Codelune

Builds a complete visual theme for a website or app from one brand color: a light and a dark color palette (background, surfaces, text, primary, accent, success, warning, danger and more) in which every text and background pairing is measured against WCAG contrast, plus a type scale with fluid sizes, spacing, corner radius and shadows. Returns ready-to-paste CSS variables, or a theme object for React Native. Use it before writing the styles of any page, app screen or component, so the colors are consistent and readable, then build with the returned tokens. It takes colors and a few options only. Nothing is stored.

build_theme

Converts a moment between Unix timestamps, ISO 8601 and time zones, with daylight saving time taken from the IANA time zone database. It can also add or subtract time (days, weeks, months, hours and so on) and give the exact difference between two moments, including the number of Monday-to-Friday days. Use it whenever an answer depends on a timestamp, a time zone conversion or date arithmetic, for example to read a timestamp from a log, set a deadline or expiry, track down a time zone bug or prepare test data. Do not work these out by hand. Returns the moment in each zone with its UTC offset, the Unix time in seconds and milliseconds, the weekday and the ISO week. Nothing is stored.

convert_timestamp

Measures the exact WCAG 2 contrast ratio between a text color and the color behind it, for up to 20 pairs at once, and says whether each pair passes AA or AAA. For a pair that fails it returns the closest text color and the closest background color that pass. Use it when choosing or reviewing colors for text, buttons, links, icons and form fields, when the user asks whether something is readable or accessible, and to verify colors you picked yourself, because contrast cannot be judged reliably by eye. Colors can be hex, rgb(), hsl(), oklch() or CSS color names, and may be partly transparent. Nothing is stored.

measure_contrast

Reads a cron expression, says in plain words when it runs, breaks it down field by field and lists the next run times in a time zone. It understands standard 5-field cron (crontab, GitHub Actions, Kubernetes and most hosts), 6-field cron with seconds, Quartz and AWS EventBridge, including names, steps, ranges, L, W, # and shortcuts such as @daily. It also warns about common mistakes, such as "* 9 * * *" running 60 times, uneven "*/7" steps, and what happens when day-of-month and day-of-week are both set. Use it when the user asks what a cron expression does or when a job runs next, and to verify a schedule you wrote before giving it to the user. Nothing is stored.

read_cron