A clearer picture, through one API.

Why QuietPass exists

A phone number is a useful starting point, but different questions need different data. Is the number formatted correctly? What kind of line is it? Which network serves it today? Has the SIM behind it changed recently?

QuietPass brings those checks behind one API, with explicit coverage and availability for each result. Developers choose the checks they need and keep control over the cost and how the results are used.

Global product, focused launch

Global numbering metadata forms the foundation. New Zealand is the first market for our launch campaign and initial network integrations. Additional network coverage is assessed by dataset, country, and carrier.

Network intelligence comes from specialist data suppliers and network API providers. Availability depends on their supported markets and any required business or use-case approval. Our coverage reference describes what is connected today.

Who operates the service

QuietPass is a brand operated by C9 Ventures Ltd, a company registered in England and Wales (number 17292146), with its registered office at 71–75 Shelton Street, Covent Garden, London, WC2H 9JQ, United Kingdom. David Copsey is the founder.

For early access, partnerships, or support, contact david@quietpass.com. You can also tell us what you are building.

View C9 Ventures Ltd on Companies House.

How we describe the data

We distinguish numbering-plan metadata from network-derived intelligence. A valid number is not proof of ownership or reachability. An unavailable check is an unknown result. A SIM-swap signal is an input to a risk decision, not a verdict about a person.

Read our data handling overview, privacy notice, and website and early-access terms.