This app was mentioned in 4 comments, with an average of 3.50 upvotes
For Lost Cities, there in an actual scoring app. You don't even have to do it at the end. Each player can have the app open and add cards to the app as soon as they lay them rather than entering them afterwards.
But honestly, the app takes like 3 seconds to input all players cards afterwards. If even tracks the cards, so if you say player1 has the red 1, no one else can pick the red 1 which makes checking super easy.
Not saying your thread is wrong by any means. More of a "hey, if you do like lost cities but hate scoring, try this app"
I you have an Android phone, I made an app to help the end scoring if you'd like to check it out.
Assistant Lost Cities
https://play.google.com/store/apps/details?id=com.valloo.lostcities.scorer