I built a task scheduler with cron parsing from scratch in Python — zero dependencies

Every cron library I looked at pulled in a pile of dependencies for what is, fundamentally, a string-to-schedule conversion. So I decided to write one from scratch — and then kept going until I had a complete task scheduler.

CronLite is ~5,300 lines of Python. Zero external packages. Everything from the cron parser down to the SQLite storage layer uses nothing beyond the standard library.

GitHub · Live Demo

What it does

Full POSIX cron parsing (wildcards, ranges, steps, lists, month/day names, presets)