# Your Contacts. Every Device. ==Always in Sync.==

Kristine is a cloud-first contact manager that backs up your entire native address book, syncs edits across every device with a three-way merge engine, resolves conflicts field-by-field, and gives you API access to your own contacts. iPhone, iPad, Android — one address book, always in harmony.

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## ==Intelligent== Sync Engine

Every contact is fingerprinted with SHA-256 so only changes are transferred — no wasted bandwidth. When two devices edit the same contact, a three-way merge engine computes what each side changed against a shared baseline. Array fields like phones and emails merge automatically; scalar conflicts are flagged for your review. Sync triggers automatically on app open, via pull-to-refresh, or with a manual Sync Now button.

## Your ==Complete== Address Book

Kristine preserves every native contact field: multiple phones, emails, addresses, dates, social profiles, instant messaging, relations, URLs, notes, birthday, company, job title, and department. Fast debounced search finds anyone instantly across name and company. Contacts are matched by phone number or email across devices — one person, one record, no duplicates. Deleted contacts are soft-deleted and archived in the cloud, never truly lost. Contact photos sync at full resolution to secure cloud storage.

## Powerful & ==In Your Control==

When two devices edit the same field differently, Kristine flags the conflict and lets you choose which value to keep — per field, not per contact — from a dedicated Conflicts screen. Register and track all your devices from one dashboard with platform, friendly name, and last sync time at a glance. Generate personal API keys to query your contacts via a JSON-RPC HTTP endpoint, or connect Kristine's MCP server to Cursor, Claude, or any AI assistant. Sign in instantly with Google via Clerk.

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