Upvote:2
I've been using Tricount for a while. I like how simple it is, especially as it works offline. It is designed to share expenses but it would also work if you are on your own.
The part where you add your expenses is free, but exporting is a premium feature. And they mostly work as a subscription-based service. But, they also, once in a while in the app, offer the possibility to only make your current trip premium, for a one-time fee (around 1-2 euro).
If you cannot get this one-time payment for premium features, you may as well pay the subscription only for one month, when you want the numbers (assuming you don't travel forever or you don't need the precise accountancy number every month).