A trip does not need a course. It needs the ten situations you will actually be in, practised until the first real attempt is not the first attempt.
Short answer
If you fly in a few weeks, do not start a course. Practise the situations you will actually be in: ordering, paying, asking directions, checking in, the pharmacy, a taxi. NativePal's Immersive Scenarios play those situations with a character that reacts to what you say, Speaking Practice gets the key phrases pronounced so they are understood, and the dictionary keeps the words you look up. It needs an internet connection, so it is preparation before and between conversations, not an offline phrasebook.
Courses are built for a year and start with things you will not need at the airport. A traveller with three weeks needs a different order: the fifty phrases that carry most transactions, pronounced clearly enough to be understood, and enough practice saying them that the words come out under mild stress.
Phrasebooks solve half of this. They give you the phrase but not the reply, and the reply is where travellers get stuck. Practice has to include the other side of the conversation.
Practise the transaction, not the grammar behind it.
NativePal needs an internet connection for anything AI-generated, so it is not an offline phrasebook and it does not translate live speech at the counter. Prepare with it, then put the phone away.
If the language uses a script you cannot read, a few weeks will not fix that. Focus on listening and speaking the phrases, use the audio on every word, and treat reading as a bonus.
About fifteen minutes a day, inside the free allowances.
Enough to order, pay, ask, thank and cope, yes, if you practise those transactions rather than a syllabus. Fluent conversation takes far longer. Set the goal at being understood in the ten situations you will meet, and you can get there in weeks.
No. Scenarios, feedback and generated content need a connection. Practise before you go and on hotel Wi-Fi, and use a dictionary app or a downloaded phrasebook for moments without data.
Ordering in a cafe or restaurant, checking into a hotel, buying tickets, asking for directions, a pharmacy or doctor's visit, and a taxi. Practise each until the replies stop surprising you.
That is what the teleprompter score is for. Read your key phrases aloud, look at which sounds are marked, and drill those. Being understood usually depends on a handful of sounds and on stress, not on sounding native.
For practice, yes: a phrasebook gives you the phrase, a scenario gives you the reply and a chance to respond. For quick lookup at the counter, a phrasebook or dictionary app is better because it works offline.
Scenarios that answer back, pronunciation that gets understood, and a dictionary that travels with you.
Free to start. No account needed.