Coinjar is described as 'Bitcoin can do amazing things. As Australia's largest, longest running and most trusted bitcoin company, CoinJar makes it simple. Get started with bitcoin in seconds' and is a cryptocurrency exchange in the bitcoin & cryptocurrency category. There are more than 50 alternatives to Coinjar for a variety of platforms, including Web-based, Android, iPhone, iPad and Mac apps. The best Coinjar alternative is Proton Wallet, which is both free and Open Source. Other great apps like Coinjar are Electrum, Bisq, Unstoppable Wallet and Coinbase.
Electrum is a wallet, not exchange