Beware of using this wallet since it's new wallet created since 2021 same like their company VSolidus.
On 2016 there's an exchanges named novaexchange
[ANN] Novaexchange.com - Crypto currency exchange but they're already closed since 2018 or 2019. Novaexchange seems to be a shady exchange since many people complaining on their thread.
I think with the 2 years gap, it might from the same people who create this nova wallet.
If you worried to use web wallet, you can use Ledger since AFAIK Ledger support those 3 coins you mentioned above.