N26 have launched stock and ETF investment options for Irish customers. Depending on your account you get a certain number of free trades per month, and then €0.90 after that.
Just had a look in the app, pretty nice interface for it in fairness and good tutorials.
Have you tried IBKR/Degiro? Set up an account with IBKR a few weeks ago and they seem to be the best overall going on what people are saying online. I'm sticking with Revolut and using IBKR for the foreseeable future but I could be swayed
No mention about tax treatment which is a bit disappointing. I was hoping they might have some clever handling of Irish tax and deemed disposal to make it a one click simple experience.