Features
One address book, everywhere you keep contacts
Connect Google, Microsoft 365, iCloud, and any CardDAV-based address book — ContactZapp keeps them all in sync, automatically.
- Connect as many accounts as you want, from any supported provider
- Choose two-way sync (we keep it updated) or read-only (we just watch)
- Pick exactly which contact labels or folders come across
- Reconnect or unlink an account any time — nothing at the source is ever touched by unlinking
Never deal with duplicate contacts again
ContactZapp spots the same person hiding under different names, typos, or accounts — and tells you exactly how confident it is.
- Smart matching finds duplicates across every connected account
- Each match shows a confidence score, so you know how sure we are
- One click merges every duplicate we're highly confident about
- Say "not a match" once, and we'll never suggest that pairing again
You're always in control of the merge
When two contacts might be the same person, you see exactly what's different — and decide what survives.
- Side-by-side view of every version, from every account
- Pick the winning value field-by-field, or take one account's version wholesale
- Keep multiple phone numbers or emails instead of being forced to pick one
- Edit the final merged contact before it's saved
A contact list that tells you the truth
Search, filter, and see the real state of every contact — synced, duplicate, or missing somewhere.
- Search by name, email, phone, company, notes, or any custom field
- Filter by account or by status in one click
- See at a glance which contacts are fully synced and which need attention
Undo anything, from any point in time
Every change is tracked, so you're never one bad sync away from a mess.
- A full timeline of every change made to your contacts
- Roll back a single contact, one account, or everything — to any moment in the past
- See exactly what changed with a clear before-and-after view
- Nothing is ever silently overwritten
Delete with confidence
Soft delete when you want a safety net, permanent erasure when you don't.
- Deleted contacts are recoverable until you say otherwise
- Permanent deletion removes a contact everywhere, including your connected accounts — true GDPR-style erasure
- Wipe your whole account and start fresh, any time
- Every destructive action asks you to confirm first — no accidental data loss
Built to be trusted with your real contacts
- Your contact data is encrypted at rest — a raw copy of our database is useless without your key
- Your login credentials and access tokens are never exposed in logs or error messages
- Sync failures never lose data — they're retried safely, never silently dropped
- You choose which accounts we write to; read-only means read-only