Short answer: with TripIt, five. With Departure Ready, all of them. Here is the detail, with a link to TripIt's own documentation so you can check.
TripIt supports five. Their help center says it directly: TripIt supports confirmation
emails from thousands of suppliers around the world, in English, French, German, Japanese and Spanish.
That is a real and useful range, and it covers a lot of travel. TripIt also lists language as a cause of a
failed import, and suggests resending the confirmation in a supported language if you are able to.
Source: TripIt help center
Departure Ready has no number. Not because it is unlimited by marketing fiat, but because there is nothing in the design that counts languages. The email is handed to Claude, which reads it. There is no per-language parser to write, so there was never a decision about which languages were worth the engineering time.
All of these parse in Departure Ready. None are claimed by TripIt.
The pattern is worth noticing. The five supported languages map almost exactly onto the largest airline and hotel-chain markets. That is not an accident: template parsers get written for the providers with the most bookings. It also means the gap is widest precisely where independent travel happens, which is the Portuguese guesthouse, the Greek island ferry, the Italian agriturismo, the Thai transfer, the Croatian apartment.
A template parser works by knowing in advance what a message looks like. Somebody reads twenty Air France confirmations, works out where the departure time sits in the layout, and writes a rule. Do that a few thousand times and you have a travel organizer.
Every one of those rules is language-specific. Heure de depart, Abflugzeit and Hora de salida are three separate pieces of work, and that is before the date formats, which disagree with each other more than the words do. A supported-language list is really a list of how many times a team was willing to do that work.
Reading removes the step. The model was not taught what an Air France email looks like, it was taught to read, which is why the same code path handles a Japanese rail booking and a handwritten-looking confirmation from a family-run hotel in Puglia. The honest trade is that a reader can misread, where a template parser is either exactly right or silent. That is why every card in Departure Ready carries a Something wrong? link that re-reads the original email and asks you to confirm the fix.
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