Safe QR & Barcode Scanner Android + iOS

Safety features

• Scam-link analysis: shows the real website in large type and flags look-alike characters (punycode), IP addresses, user@host tricks, bank names hidden in subdomains, URL shorteners, risky domain endings, plain http and odd ports.
• Dangerous links have no big "Open" button and need confirmation. The app never contacts a scanned link until the user taps Open.
• Payment QR codes (EMVCo / VietQR): decoded field by field, with a CRC integrity check that catches edited amounts.
• Product barcodes: check digit, GS1 registration country with an honest disclaimer, optional Open Food Facts lookup with Nutri-Score.

Scanner

• Multi-frame confirmation, aim-box filtering, tap-to-pick when several codes are visible.
• Auto, manual and continuous modes; QR-only and barcode-only filters on the scan screen.
• Inverted-code retry, low-light hint and zoom suggestions (Android), scan from photos.
• Wi-Fi (one-tap connect), vCard/MeCard contacts, phone, SMS, email, geo, calendar events, text.

Also included

• QR generator for text, links, Wi-Fi, contacts, phone, email and SMS.
• History with search, favourites and CSV export, stored on the device only.
• AdMob banner on History and Settings only, with Google UMP consent (GDPR-ready).
• Six languages: English, Vietnamese, French, Spanish, German, Italian.
• tools/rebrand.py: new app ID, bundle ID and app name in one command.
• Ready-to-paste store listings (6 languages), a privacy policy template (6 languages) and Google Play Data safety answers.
• Codemagic workflow that builds the iOS app and uploads it to TestFlight.
• Unit tests for the shared core and scanner logic.

Tech stack

Kotlin 2.4, Jetpack Compose (Material 3), CameraX + ML Kit (on-device), Room, DataStore, OkHttp, ZXing (generator), Kotlin Multiplatform; SwiftUI, VisionKit, Vision, SwiftData, XcodeGen; Google Mobile Ads + UMP.