Erm, who made this and why should I trust it? Wallet apps need a lot of trust behind them, more than a normal app. It could be really well made and still run off with my money if they're malicious or just implemented the crypto wrong.
Similar to how I put the majority of my money in a savings account and keep my savings account lower.
https://www.theregister.co.uk/2017/11/10/parity_280m_ethereu...