What We Shipped This Week

Fastmail calendar syncing

manyCalendars now supports Tab Sync from Fastmail's calendar view. Fastmail is popular among privacy-conscious professionals and power users who prefer an independent email provider. If you have Fastmail's calendar open in a tab, manyCalendars can now read events from it the same way it reads Google Calendar and Outlook.

To use it: open your Fastmail calendar in a browser tab, switch to week view, then add it as a new calendar in manyCalendars using the "Tab Sync" source type. Events will be imported with titles, times, and any meeting links detected in the event details.

Zero-gap conflict detection

Previously, manyCalendars only flagged conflicts when two events overlapped in time (i.e., one event's start fell between another event's start and end). Now, manyCalendars also detects "adjacent conflicts" where two events on different calendars have zero gap between them. If your Client A standup ends at 10:00 and your Client B sprint planning starts at 10:00, those events are now flagged with a yellow warning indicator.

This is different from a true overlap (which gets a red indicator). The yellow warning says: these do not technically conflict, but you have zero minutes to transition between them. For meetings across different clients that require context-switching, zero gap is effectively a conflict.

You can disable this in settings if you prefer only true overlaps to be flagged.

Availability export with slot duration

The availability export feature now includes the duration of each available slot. Previously, the export showed time ranges like "10:00-11:30 AM." Now it also shows the duration: "10:00-11:30 AM (90 min)." This makes it immediately clear which slots can accommodate a 60-minute meeting versus which ones are only 15-minute gaps.

When you paste your availability into Slack or email, recipients can quickly scan for slots that are long enough for their meeting without doing the math themselves.

Mobile-width UI polish

manyCalendars's popup now renders cleanly at narrower viewport widths. The sidebar collapses into a hamburger menu below 480px. Event cards in the calendar grid use a more compact layout on small screens. The topbar conflict count and calendar toggle buttons are now touch-friendly with larger tap targets.

This matters for users on smaller laptop screens or those who keep their browser window narrower. The extension should feel just as usable at 400px wide as it does at 800px.

Up next

We are working on ICS feed auto-refresh intervals (so you can set per-feed polling frequencies), a keyboard shortcut for toggling calendar visibility, and improved event deduplication for calendars that sync the same event from multiple sources.

Got a feature request? We are one person and a browser extension, not a faceless corporation. Replies go to a real inbox. And if you are not using manyCalendars yet, this week's updates are waiting for you. Install free and see what a week of shipping looks like from the inside.