Fastmail Calendar vs Slotly

Fastmail Calendar is an online calendar integrated with Fastmail email, available on web, Linux, macOS, Windows, Android and iOS. It supports two-way calendar sync and shared calendars, including business plans with sharing and administrative controls. Users can bring in calendars from Google, iCloud and elsewhere, search instantly, and organize events with drag-and-drop editing. It can show schedules in other time zones, compare emailed event updates with earlier versions, and manage calendars offline in its apps; changes sync when the device is back online. Fastmail documents calendar access through CalDAV and JMAP APIs for account data more broadly. The service is paid, has a 30-day trial and does not list a free plan. Options include Basic at $4 a month, Individual at $6 a month, Standard at $6 a month, Duo at $10 a month, Professional at $10 a month and Family at $14 a month. Longer billing terms have separately listed rates. Fastmail was founded in 1999 and is headquartered in Melbourne, Australia.

Slotly is a scheduling workspace for booking meetings, coordinating shared calendars, and managing availability from the web or Android. It includes booking links, people records, routing forms, meeting polls, one-off links, managed event templates, and mobile schedule management. With Smart Overlay, guests can compare an imported.ics calendar against a weekly grid to find mutual openings. Hosts can rank availability windows as Ideal or Backup so preferred times appear first. Team features include round-robin distribution, collective availability, organizations, subteams, and a shared master calendar. Routing forms direct guests to event types based on answers, while meeting polls collect votes on candidate times. The site lists Google Calendar two-way sync,.ics downloads, timezone conversion, and double-book prevention; Outlook is also mentioned in its calendar-sync section. Developer tools include API keys, REST endpoints, signed webhooks, delivery logs, retries, OpenAPI docs, and Zapier/Make recipes. Analytics cover bookings, page views, conversion, sources, routing performance, and team utilization. The free plan is billed forever at free and allows one event type and up to 100 bookings monthly. Standard is $10 a month; Team is $15 a month per seat. A 14-day trial is listed.