# CURL.LY Offline

> Privacy-First, 100% Offline QR Code & Barcode Generator for iOS & Android.
> Canonical Website: https://offline.curl.ly
> Support Email: cs@off.curl.ly

## Executive Overview
CURL.LY Offline is a privacy-first, client-side mobile utility that generates 2D QR codes and linear barcodes instantly on-device without internet access, account creation, or cloud tracking.

- Developer: Made with care by CURL.LY (https://curl.ly)
- Support & Inquiries: cs@off.curl.ly
- Application ID (Android): ly.curl.offline (Targeting Android 16 / API Level 36)
- Bundle Identifier (iOS): ly.curl.offline (Targeting iOS 15+ / Built with Xcode 26+)
- License: MIT License
- Architecture: 100% Client-Side execution using bundled JavaScript engines (qrcode, jsbarcode) on Capacitor 8 and React 18.
- Brand Theme: Pitch Black (#000000) base, Deep Charcoal (#111111) surfaces, Electric Amber (#FFCC00) brand accents, Emerald (#10B981) local indicator.
- Strict Visual Mandate: Zero star or sparkle icons, emojis, or rating widgets.

## Supported Formats & Capabilities

### 1. 2D QR Code Formats (7 Types)
- Plain Text: Multi-line text, Unicode, emojis, special characters.
- Website URL: Standard web addresses with automatic HTTPS recommendation.
- Wi-Fi Network: Standard ZXing format (WIFI:S:...;T:...;P:...;H:...;;). Supports WPA/WPA2/WPA3, WEP, and Open (nopass). Sensitive Wi-Fi passwords are automatically masked with bullets (••••••••) in local history views.
- Contact Card (vCard 3.0): Structured contact card (Name, Phone, Email, Org, Title, URL, Address).
- Email: RFC mailto scheme with percent-encoded recipient, subject, and body.
- Phone: Direct telephone URI (tel:) with international country code preservation (+).
- SMS: Standard text message URI (sms:).

### 2. Linear Barcode Symbologies (8 Formats)
- Code 128: High-density full standard ASCII (0-127). Auto-switching modes.
- Code 39: Uppercase alphanumeric and symbols (- . $ / + %). Auto-converts lowercase.
- EAN-13: 12 or 13 digits with automatic Modulo-10 check digit calculation.
- EAN-8: 7 or 8 digits with automatic Modulo-10 check digit calculation.
- UPC-A: 11 or 12 digits for North American retail with Modulo-10 check digit.
- UPC-E: 6, 7, or 8-digit zero-suppressed retail codes.
- ITF (Interleaved 2 of 5): Numeric pairs with strict even-length validation.
- Codabar: Numeric and symbol sequences with automatic framing delimiters (A...A).

### 3. Data Privacy & Air-Gap Guarantees
- 0 Remote Generation: Payloads are never transmitted to external APIs or remote servers.
- Local Storage Only: Recent records are saved solely inside device local storage (localStorage).
- FIFO History Cap: Strictly capped at 30 items. Oldest records are automatically pruned.
- Zero Behavioral Trackers: No Google Analytics, Firebase Analytics, Mixpanel, Crashlytics, or Sentry SDKs.
- Instant Wipe: One-tap "Clear All History" permanently purges all saved records from the device.

## Key URLs & Inquiries
- Homepage & Technical Showcase: https://offline.curl.ly/
- Privacy Policy: https://offline.curl.ly/privacy.html
- Terms of Service: https://offline.curl.ly/terms.html
- Contact & Support: https://offline.curl.ly/contact.html
- Direct Support Desk: cs@off.curl.ly