In the Italian city of Cagliari, the ranking of cryptocurrency app downloads can vary depending on various factors such as popularity, user preferences, and market trends. While the specific rankings may fluctuate, some of the top cryptocurrency apps that are commonly downloaded in Cagliari include:

1. Coinbase: Coinbase is one of the most popular cryptocurrency exchange platforms that allows users to buy, sell, and store various cryptocurrencies such as Bitcoin, Ethereum, and Litecoin. It offers a user-friendly interface and secure storage options.

2. Binance: Binance is another widely used cryptocurrency exchange platform that offers a wide range of trading pairs and advanced trading features. It is known for its low fees and high liquidity, making it a favorite among traders in Cagliari.

3. Bitfinex: Bitfinex is a cryptocurrency exchange platform that offers advanced trading tools and margin trading options for experienced traders. It is known for its high trading volumes and deep liquidity in various cryptocurrency markets.

4. Kraken: Kraken is a popular cryptocurrency exchange platform that offers a wide range of cryptocurrencies for trading and margin trading options. It is known for its robust security features and regulatory compliance, making it a trusted platform among users in Cagliari.

5. Blockfolio: Blockfolio is a popular cryptocurrency portfolio tracking app that allows users to monitor their cryptocurrency investments in real-time. It offers features such as price alerts, portfolio tracking, and news updates, making it a valuable tool for cryptocurrency investors in Cagliari.

Overall, the ranking of cryptocurrency app downloads in Cagliari may vary based on individual preferences and needs. However, the above-mentioned apps are some of the top choices among users in the city due to their user-friendly interfaces, security features, and advanced trading options.