Everything ContactZapp does, in detail.

• Google (Gmail and Google Workspace)
• Microsoft (Microsoft 365 and Outlook)
• Apple iCloud
• any CardDAV server

Google and Microsoft through their own sign-in, so we never see your password. iCloud with an app-specific password. Other CardDAV servers with a server address, username and password.

Depends on your plan — see Pricing

Two-way or read-only, set per account

Choose which labels sync, per account

Stop reading from and writing to an account without unlinking it

Any time. Nothing is deleted at the source

Both ways: a change in any two-way account reaches all the others

Hourly, daily, or only when you ask

In any connected account, or in ContactZapp itself

Names (including middle name and nickname), email addresses, phone numbers, postal addresses, company, job title, birthday, notes, websites, instant messaging, relationships and labels

Synced to iCloud and CardDAV. Read from Google and Microsoft, but not written back to them.

Synced between iCloud and CardDAV accounts. Google and Microsoft have no equivalent field.

A label a contact has in one account is added to it in the others. If the label doesn’t exist there, ContactZapp creates it or skips the contact — your choice.

Optionally passed on to the other accounts, and restorable for 30 days

If a contact changes in an account while ContactZapp is updating it, nothing is overwritten. Both versions are kept for you to choose between.

If one account deletes an email address or phone number another account still has, the value is kept and the contact is flagged for your review

Within each account and across all of them

On every match. High when an email or phone number matches too, low when only the name does.

Every version side by side. Choose field by field, or accept the proposed merge.

Every phone number, email address and postal address from every version is kept

Remembered permanently for that pair

Optional. Its values win when accounts disagree; without one, the most recent change wins.

The fuller value wins (“Michelle Hernandez” over “M. Hernandez”). Optionally the same for phone numbers and addresses (+39 02 5555 118 over 025555118). The most recent change breaks ties.

Merges every duplicate above a confidence threshold in one go. Default 95%. You can lower it, but never below 70%.

Before Auto-Merge runs, see how many contacts would merge, how many would wait, which values would change, and the closest calls

Straight from the confirmation, or later from History

Every change ContactZapp makes, and every change it picks up from your accounts

12 months

Before and after, field by field, grouped by day. For all contacts or for one.

One contact, one sync run, or everything, to any moment in the last 12 months. The result is written back to your accounts.

The confirmation lists every contact a roll back will change

A roll back is recorded in the history, so it can be rolled back too

Shown while a sync runs, with a summary when it finishes

Every run from the last 30 days, account by account

• Synced
• Not synced
• Duplicate
• Needs review
• Deleted

By status and by account

Any field: name, email, phone, company, notes, custom fields

Label, export or delete a selection of contacts

You see which account needs attention and what to do — reauthorize or retry

Retried automatically, never silently dropped

Daily, weekly, monthly or off: what synced, what’s waiting for review, and how the runs went

Removes the contact from every two-way account. Restorable for 30 days.

Permanently, from ContactZapp and every connected account. Suitable for GDPR erasure requests.

On demand, encrypted, up to 5 per account. Download any time.

Everything in one file: vCard for any other app, or JSON including every merge decision. Single accounts and selections as vCard.

Empties ContactZapp and disconnects every account. It shows exactly what it will remove before it does anything.

Your contacts are encrypted with a key unique to your account, not one shared key

Enforced. If an account only allowed reading, nothing is written to it, whatever the settings say.

Passwords and access tokens never appear in logs or error messages

Google, Microsoft, or a one-time code sent to your email. There’s no ContactZapp password.

Every change that touches a provider is tested against real accounts before it ships