The short answer
Answer a few questions, get a checklist
For before you leave, when you arrive and flying home
Each item links to its source guide
Those guides list the official sources and the dates they were checked
Uses guides on plugs, phone, medicine
Also food, duty-free, luggage delivery, Haneda/Narita transfers, Shinkansen luggage, JR
Nothing is sent anywhere or saved
Your choices are checked only on this device
Answer a few questions about your trip, and you get a checklist for before you leave, when you arrive and flying home. Each item links to the guide it comes from, where the official sources and the dates we checked them are listed.
Everything you choose here is checked only on this device and is not sent anywhere. Nothing is saved.
Answer the questions above, and your checklist appears here.