I doubt you need more than a notepad app. It’s what I used the last two times I had to move between countries and it was more than enough for me and customs. I simply wrote down important stuff as I put them in numbered boxes.

Here’s a sample:

• 15 - camera stands / shoemaking tools / notepads / trophies / guitar cable / weaved basket X2 / cooler bag / curtain rings X 3 / …
• 25 - Nespresso coffee machine, Italian coffee maker, plates & dishes, kitchen utensils.
• 26 - casserole, dishes, plates, kitchen stuff
• 27 - casserole, cups
• 28 - wedding dress, photos, various cat stuff, photo bag