CoinIn: Coin Scan Identifier represents a significant advancement in numismatic technology, offering collectors and enthusiasts an automated solution for coin identification and valuation. Developed by Vortemol Limited, this iOS application leverages machine learning algorithms to analyze coin images and deliver comprehensive information within seconds, positioning itself as a digital alternative to traditional coin catalog research. The core functionality centers on its image recognition system, which processes obverse and reverse coin designs to match against an extensive database of global currencies. Beyond basic identification, the app provides detailed metadata including mint years, historical context, production figures, and current market valuations based on recent auction data and dealer pricing. The integrated marketplace feature facilitates connections between collectors and verified sellers, creating a closed-loop ecosystem for coin transactions. User experience demonstrates thoughtful design with a streamlined three-step process: capture, analyze, and review. The interface maintains minimalistic controls while providing robust filtering options for search results. Real-world testing shows effective performance under various lighting conditions, though optimal results require clear, well-lit images. The app processes most identifications within 3-7 seconds, with complex or damaged coins occasionally requiring additional processing time or manual input assistance. User feedback trends consistently highlight satisfaction with identification accuracy and speed, as evidenced by the 4.69/5 rating across thousands of reviews. User 'Ace Boogie2316' (August 3, 2025) noted 'extremely useful accurate easy to use,' while 'Major Digg64' (September 2, 2025) reported positive initial experiences with historical coins. The development team demonstrates responsive support, as user 'Andiotdjddu' (August 24, 2025) acknowledged resolution of technical issues following developer intervention. The application excels in accessibility and speed but faces limitations with exceptionally rare, damaged, or improperly photographed specimens. Valuation estimates should be considered approximate rather than definitive appraisals, and marketplace features remain dependent on regional user adoption. Ideal for casual collectors, estate evaluators, and educational users seeking rapid coin information, though professional numismatists may require supplemental verification for high-value specimens.