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Notes on running more than one calendar. How to sync Google and Microsoft 365, avoid double bookings and decide what a client should be able to see.
Why we built Caltsu
Every calendar sync tool I tried copied event titles between calendars, so I built one that writes Busy instead.
Company3 min readIs your calendar data private? What SaaS tools know about you
What your calendar sync tool can read, what it keeps, and how to check a service before you connect your calendar.
Privacy5 min readGoogle Calendar vs Outlook: which is better for multi-account users?
A head-to-head comparison of Google Calendar and Outlook for managing multiple accounts. Why neither handles several accounts well, and how to fix it.
Comparisons5 min readHow to prevent double booking across multiple calendars
Why separate work and personal calendars lead to double-booking, the manual fixes people try, and how a two-way busy sync solves it.
Sync setup5 min readGoogle Calendar and iCloud Calendar: 3 ways to use them together
Apple and Google don't sync calendars with each other. Three workarounds using their own settings, and what each one can't do.
Sync setup5 min readCalendar sync on iPhone: keep all events updated
How to add Google and Outlook calendars to your iPhone, turn on Push, set the right default calendar, and fix missing or duplicate events.
Sync setup7 min readCalendar sync: how to manage multiple calendars
How calendar sync works across Google, Outlook and Apple, the four ways to set it up, and the mistakes that cause duplicates and double-bookings.
Sync setup8 min readCalendly vs Cal.com: which tool wins?
Calendly vs Cal.com compared on pricing, free plans, interface, integrations and branding, and why neither prevents double-booking on its own.
Comparisons7 min readFree calendar sync: a guide to tools and limits
What free calendar sync can do: Google and Outlook sharing, Apple Calendar and iCal links. Where each falls short, and when a paid sync tool is worth it.
Sync setup5 min readCalendar sync on iPhone and iPad: fix common issues
Why calendars stop syncing between iPhone and iPad, and how to check iCloud, Apple Account, Google and Outlook settings on both devices.
Sync setup5 min readCalendar sync for Outlook: top tools and methods
The built-in ways to sync Outlook with Google Calendar and other Outlook accounts, where they fall short, and the tools that block busy time.
Comparisons7 min readGoogle and Outlook calendar sync: iCal, Caltsu or Power Automate
Three ways to sync Google and Outlook calendars: iCal subscriptions, a sync tool like Caltsu, and Power Automate. Speed, privacy and cost compared.
Comparisons7 min read11 best Calendly alternatives (free and paid)
11 Calendly alternatives compared: Cal.com, SavvyCal, Acuity, Microsoft Bookings and more, plus when you need calendar sync instead of a booking link.
Comparisons9 min readStop double-booked meetings: a prevention guide
Why double-booked meetings happen when work and personal calendars stay separate, the fixes that fail, and how calendar sync and a few habits prevent them.
Sync setup6 min readPrevent calendar conflicts: stop double-booking now
Why double-booking happens across work and personal calendars, and how syncing busy time, buffers and a regular audit prevent it.
Sync setup6 min readHow to sync Google Calendar and Apple Calendar
Show Google Calendar events in Apple Calendar on iPhone and Mac using Apple's and Google's own settings, and fix missing calendars and slow updates.
Sync setup6 min readHow to sync multiple calendars: setup guide
How to sync three or more work, client and personal calendars so each one shows your real availability, with privacy and troubleshooting tips.
Sync setup7 min readHow to sync Google Calendar: complete guide
Step-by-step ways to sync Google Calendar with another Google account, Outlook, a Mac or an iPhone, plus fixes for missing and duplicate events.
Sync setup6 min readGoogle Calendar vs Outlook Calendar: differences, and how to use both
Google Calendar and Outlook compared on price, sharing, apps, integrations and admin controls. Who each one suits, and how to keep both in sync if you use one for work and one at home.
Comparisons6 min read
Looking for setup steps? Read the guides.