I looked into Ledger when I was writing a small invoicing app (of course I wrote it from scratch – but I learnt a few things and have a small app in my portfolio).

For this project I'd argue that you need to host it yourself, you don't get powerful visualisation (charts for monthly breakdowns) and extensions (like GoogleFinance for currency conversions).

From a privacy perspective – it'd be a better choice but you are responsible for securing your server.

Which ledger do you mean? I found several with that name...