Hey there,

No offence, but I'd rather flip a coin 256 times than trust an unverified tool with that. No coder myself, unfortunately, so I can't check whether the tool is not providing me with one of the, say, 10 million keys which are stored in its memory.

Spending extra 25-45 mins is not that much compared to the possible risk of having a private key known to someone else, imho.