About

A narrow tool for a messy scheduling problem.

Overlap Days is an independent browser utility created by Jisung Kim and published as the O product in the WEBBE-B tool index.

The tool was designed around a practical problem: repeating shift cycles may look simple individually but become difficult to compare across partners, friends, family members or small teams—especially when overnight work consumes part of the following day.

Product principles

• Do one scheduling task clearly.
• Run calculations in the active browser.
• Avoid mandatory accounts and a central schedule database.
• Publish the method and exclusions.
• Keep public-holiday data outside the initial scope.

Contact

Report a reproducible issue to its.me.jsKim@gmail.com. Include the browser, device, pattern, anchor dates and expected result, but do not send employer-confidential rosters or personal identity documents.