• Audio is built in. Tap any phrase to hear it in a native voice — pre-recorded and cached, so it just works offline, no setup. (The voice bar can still pick a phone voice as a backup.)
• Phrases — drilled by situation: the taverna, bars, directions, the boat. Hit play, then say it back out loud.
• Sounds — the whole alphabet, tap to hear every letter. Ten minutes here pays off the most.
• Customs — the unspoken rules. This is where tourists actually give themselves away.
• Practice — hear / read / recall / speak. Use it on the plane.

Right thing, right moment.

Tap a chip to jump to a scene — or just search. Common holds the go-anywhere basics (hello, thanks, where's the toilet); a few phrases like drinks live under more than one scene.

• Tens and ones join with και (and), not by bare juxtaposition. 21 is είκοσι ένα, often fuller as είκοσι και ένα ("twenty and one"). In fast speech the και is dropped for two-digit numbers, but it reappears once a hundreds or thousands word precedes: 121 is εκατόν είκοσι ένα.
• 200-900 are fused, gender-agreeing compounds — 100 alone is not. 100 alone is εκατό, but 200-900 are single words that shift ending for gender: διακόσια/διακόσιοι (200), τριακόσια (300)... For prices (ευρώ), the -οι ending is used: διακόσιοι ευρώ.
• χίλια takes no leading "one"; εκατό takes a linking -ν before a vowel. 1,000 is bare χίλια, never ένα χίλια. When a hundred-compound is directly followed by a number with no word between, εκατό gains -ν before a vowel: 101 is εκατόν ένα.
• 1, 3 and 4 change form for gender right before a noun. Ένα (1) has forms ένας/μία/ένα; τρία/τέσσερα become τρεις/τέσσερις before most nouns. Ευρώ mostly sidesteps this (ένα ευρώ, τρία ευρώ), but expect ένας/μία elsewhere.
• εκατομμύριο is an ordinary noun and pluralizes. Ένα εκατομμύριο (1,000,000), and 2+ million pluralizes regularly: δύο εκατομμύρια, πέντε εκατομμύρια — the -ο becomes -α.