About Slotlu
Updated 2026-11-11
Slotlu is a time zone meeting planner: it finds meeting times for people in different cities. You add each person with their time zone and the hours they are happy to meet; the planner ranks the best start times for a day, shows everyone’s local time on a day-and-night timeline and writes one message with every option in every time zone. A second page, the research interview scheduler, is for user researchers who offer different slots to different participants.
What it checks
- Early, late and night times against each person's own hours, and meetings that land on a weekend for someone.
- Daylight-saving changes within a week of each option, using the IANA time zone data built into your browser, including zones with half-hour and 45-minute offsets.
- Local times that do not exist (clocks going forward) or happen twice (clocks going back).
What it produces
Ranked best start times for the day you pick; one message for the whole group (or, on the research page, an invitation per participant); a check list of every option in every zone; calendar files (.ics, RFC 5545) for one option or for all options as tentative holds; a Google Calendar link for each option; and a share link that carries the whole plan without an account.
How your data is handled
Everything runs in your browser. People and times are saved in this browser's local storage and are not sent anywhere. The planner does not book meetings, read calendars or send email. See the privacy page.
Formerly the Time Zone Planner
Until November 2026 Slotlu was called the Time Zone Planner and lived at sessions.txtloom.net. Old links now lead here. Browsers keep saved plans per web address, so a plan saved on the old address does not appear here: add the people again, or open a share link made with the old address.