// CERNA — APP
CERNA
The important stuff hides on your phone. Cerna finds it.
An on-device document finder for iPhone. Point it at a folder and it surfaces the receipts, contracts, IDs, and keys you forgot you had — sorted, searchable, and routed where they belong. Nothing you scan ever leaves your device.
// WHAT IT DOES
A contract you signed once. A receipt you'll need at tax time. Your insurance card. An API key you pasted into a note and forgot. It's all buried on your phone — in Files, in Downloads, in screenshots — right up until the moment you actually need it.
Point Cerna at a folder and it surfaces what matters, sorted into categories, with the noise kept out of your way. New documents get caught as they arrive. And every bit of it happens on your device — no account, no cloud, no server that can leak.
// FEATURES
SURFACES WHAT MATTERSPoint Cerna at a folder and the important documents rise to the top — receipts, IDs, contracts, keys — with the noise kept out of your way.
SORTED ON-DEVICECerna recognizes documents by their patterns, not by shipping your private files to an AI to guess. It works on every iPhone, offline, on a plane.
SEARCH & SPOTLIGHTFind a document by what's inside it, not just its filename — from inside Cerna, or straight from your Home Screen via Spotlight.
CATCH FROM THE SHARE SHEETShare a PDF or photo to Cerna from any app. Stop printing the thing you were told to print — file it and move on.
SECRET-SAFEFinds API keys and passwords sitting in plaintext and routes them to the Keychain — never to a model, never stored in the clear.
REMINDERS, EXPENSES & TIDYNudges you before insurance and licenses expire, exports receipts to a spreadsheet for taxes, and clears out duplicates and stale downloads.
// HOW IT WORKS
01GRANTPoint Cerna at a folder — Downloads, iCloud Drive, wherever your files pile up.
02SURFACEIt reads each document on your device and lifts the important ones to the top, sorted.
03ACTRoute a card to Contacts, a key to the Keychain, a receipt to a spreadsheet — or just find it later.
04CATCHShare new documents to Cerna as they arrive, so nothing gets lost again.
// TECHNICAL
PLATFORMiOS 17+ · iPhone
PRICE$5.99 — one-time. No subscription, no in-app purchases.
SORTINGDeterministic on-device detectors · Apple Intelligence refines on iOS 26+
CAPTUREFolder grant · Share Extension · camera (business cards)
SEARCHOn-device text index · Home Screen via Spotlight
STORAGESwiftData (local) · Keychain for secrets · nothing transmitted
STACKSwiftUI · SwiftData · Vision · FoundationModels
PRIVACYNo analytics · No tracking · No accounts · No backend
// PRIVACY
Cerna has no backend. Your documents, the text it reads from them, and everything it finds stay on your device. Sorting runs on-device — deterministic detectors on every iPhone, refined by Apple Intelligence on iOS 26+ — so nothing you scan is ever sent to us or to any AI service. Documents that contain a secret are never handed to a model, and their contents are never stored.
READ FULL PRIVACY POLICY →