Local-first contact intelligence

ContactLens

Load contacts from CSV or VCF, paste one or thousands of phone numbers, and instantly find matching contacts, duplicate associations, and normalized Indian numbers. Everything runs locally in your browser.

100% client-side · no upload

1. Load contacts

Import a contacts CSV or vCard file. CSV phone columns are detected automatically; VCF supports FN, N, TEL and folded vCard lines.

Choose CSV / VCF or drag it here No file loaded

Load a CSV or VCF to build the in-browser contact index.

2. Numbers to look up

One number per line, or paste a comma-separated list. Indian formats with +91, 91, or leading 0 are normalized to 10 digits.

0Numbers checked

0Matches

0Not found

0Duplicate associations

Input number	Normalized	In Contacts	Contacts	Match count
Load contacts and run a lookup.

Privacy model: selected files are read with the browser File API and processed in memory. No contact data or lookup numbers are sent to a backend.

ContactLens

1. Load contacts

2. Numbers to look up

Results