Carbon - Calendar Mirror

Carbon copies events from one calendar to another, so time blocked in one shows
up in the other.

Point it at a source calendar and a destination, choose what to copy, and Carbon
keeps the destination in step.

One way, always
Carbon copies from a source calendar to a destination. It never writes back to
the source. Your work calendar stays exactly as your employer's system left it.

Choose what crosses over
Copy full event details, or copy only a "Busy" placeholder that reserves the
time without revealing the title, location, or notes. Set this per mirror, so a
sensitive work calendar and a shared family calendar can be handled differently.

See it before it happens
Every new mirror shows you a preview of exactly what will be created before
anything is written to your calendar.

It won't touch what you've touched
Carbon only ever changes events it created. Edit one of its copies yourself and
Carbon steps back and leaves it alone - permanently.

Undo any sync
Sync history shows every run. Reverse any one of them and the events it created
are removed.

Filters that keep the noise out
Skip all-day events, skip invitations you declined, skip anything shorter than a
set length, or exclude events whose titles contain particular words.

Two years ahead if you want it
Choose how far each mirror reaches - up to two years ahead and a year back. Keep
the window narrow for quicker syncs, or open it up so next year is already
blocked out.

Everything stays on your device
No account. No server. No analytics. Carbon has no way to send your calendar
anywhere, because it never talks to a network at all.

Pay once
One purchase and Carbon is yours. No subscription, no renewals, nothing to
cancel.

When Carbon syncs
Carbon syncs when you open it, and periodically in the background when iOS
allows. iOS decides how often background refresh happens, and it can be
infrequent. For syncs on a schedule you control, add Carbon's "Sync Calendars"
action to a Shortcuts automation - Carbon walks you through it.

A note on invitations
iOS does not allow apps to add attendees to an event, so copies are standalone
events without invitees. This is an iOS limitation, not a Carbon one.

A note on work calendars
Some employers restrict copying work calendar data to personal accounts, and
managed accounts may block access entirely. Check your organization's policy.