What's the best Android app for identifying old or foreign coins I find around the house?

CoinIn – Coin Scan Identifier is a practical tool for numismatists, casual collectors, or anyone sorting through mixed currency. The app uses the device's camera to scan a coin, after which it attempts to identify the country of origin, denomination, year, and sometimes even the mint mark. This process is particularly useful for quickly sorting jars of old or foreign coins where manual lookup would be tedious. One of the app's noted strengths is its streamlined interface, which reportedly includes fewer advertisements than similar services promoted on social media platforms, a point of positive feedback from its user base. Reviews indicate the image recognition performs reliably on modern Android phones, making it accessible for various users.

However, the identification accuracy can depend heavily on lighting, coin condition, and the comprehensiveness of the app's database. For extremely rare or heavily worn coins, results may be inconclusive, necessitating a manual cross-reference. While the ad experience is described as less intrusive than expected, some promotional elements are still present within the app's free version. Overall, for the common task of identifying bulk foreign or vintage coins, CoinIn provides a straightforward, largely ad-minimized solution that simplifies what is otherwise a time-consuming research project.