Share contacts on your terms.
option63 rewrites vCard data at the point where it leaves a trusted environment — before it reaches unvetted devices, untrusted clouds, or AI ingestion. Only what you allow ever crosses the line.
How it works
option63 rewrites each vCard at the boundary — sensitive fields are removed, masked, or relayed before the contact ever reaches an untrusted device, cloud, or AI agent.
BEGIN:VCARD VERSION:4.0 FN:Jamie Morgan ORG:Option63 Ltd. TITLE:Account Manager TEL;TYPE=cell:+1-555-0142 EMAIL:jmorgan@corp.example NOTE:Calls contract renewal — $240k ARR, renewal 09/15 END:VCARD
BEGIN:VCARD VERSION:4.0 FN:J.M. TEL;TYPE=cell:+1-555-0142 EMAIL:4deef0b60a8c@relay.option63.eu END:VCARD
Use cases
A vCard enters the cloud, a device, or an AI service with everything on it. option63 strips it down to the minimum safe subset first — then you ship it.
Shadow-IT
Employees may try to sync to unvetted tools no matter what. option63 strips sensitive fields at the boundary — so those tools only ever see a limited, low-risk subset.
Try itPersonal Privacy
Keep sensitive relationships private without losing convenience — redact names, addresses, and notes before they ever sync to the cloud or a low-trust device.
Try itAI Integrations
Wire AI into your systems without handing it everything. option63 reduces each record to the minimal safe subset before payloads leave your boundary.
Try itThree ways to use option63
A Rust library for integration, a CLI for pipelines, and a CardDAV proxy — all RFC-compliant, memory-safe, and designed for privacy-critical workflows.
Rust crate
`o63` — parse and display vCard files. RFC-compliant, memory-safe, built for privacy-critical infrastructure.
cargo add o63
Command line
Validate, display, and filter vCard properties — build privacy-preserving export and ingestion pipelines.
o63 vcard --help
CardDAV proxy
Make your contacts (Google, Outlook, etc) available through a CardDAV server with filtering applied.
o63 carddav --help
Need this in your stack?
We build custom deployments and CardDAV or AI integrations, run your infrastructure, or handle it for you — on-premises or hosted, with ongoing support.