There isn't one single app that's universally used for Bitcoin. You can use different apps depending on what you want to do with Bitcoin:
For buying and selling Bitcoin:
- Coinbase: A popular platform for buying, selling, and storing Bitcoin.
- Binance: A well-known exchange offering a wide range of cryptocurrencies, including Bitcoin, with trading features.
- Kraken: A reputable exchange known for its security and advanced trading options.
- Cash App: A mobile payment app that allows you to buy and sell Bitcoin.
- Revolut: A banking app that offers Bitcoin buying and selling features.
For storing Bitcoin:
- Coinbase Wallet: A secure wallet that allows you to store your Bitcoin offline.
- Electrum: A desktop wallet known for its security and privacy features.
- Mycelium: A mobile wallet that offers advanced features like Bitcoin spending and cold storage.
- Ledger Nano S: A hardware wallet that provides a high level of security for your Bitcoin.
For sending and receiving Bitcoin:
- BlueWallet: A mobile wallet focused on privacy and security.
- BRD: A mobile wallet with a user-friendly interface.
- Samourai Wallet: A mobile wallet designed for privacy-conscious Bitcoin users.
For other Bitcoin-related activities:
- Blockchain.com: A platform for exploring Bitcoin transactions and blockchain data.
- Bitcoin.org: A website with information about Bitcoin and its technology.
- Bitcoin Core: Open-source software for running a Bitcoin node.
The best app for you will depend on your individual needs and preferences.