My partner and I merged our finances when we moved to London as we both essentially started at zero here. We use pocketsmith[0] to manage and keep track of everything. It's fantastic and has completely changed the way I look at money. It has a great cashflow view and good forecasting. I now never look at our account balances, as I know, from the cashflow view, that we're definitely earning more than we spend. So now I optimise for that. I highly recommend people check it out, it's a revelation once you get it all setup.
Looking at honeydue it looks like a sub-optimal alternative to pocketsmith.
I will say as well, the necessity of apps like venmo and these splitting apps to exist at all blows my mind having always lived in countries with functioning banking systems and fast, free electronic transfers.