• 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: chai stalls, dhabas, directions, the train. Hit play, then say it back out loud.
• Sounds — the Devanagari 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.

You can type in either language — both sides are searched.

• Hindi 1-100 is not compositional the way English is. Unlike "twenty-one, twenty-two", almost every number from 11 to 99 is its own memorized word with irregular sound-changes fusing the ten and the unit together. There's no reliable rule to derive an arbitrary two-digit number — it has to be recognized or read digit-by-digit.
• In practice, even Hindi speakers read unfamiliar numbers digit-by-digit. For any number not memorized whole, reading it like a phone number — digit by digit — is the normal, honest workaround, not a shortcut just for foreigners.
• Hundred and thousand compose regularly once you have the number under 100. सौ (hundred) and हज़ार (thousand) attach after a multiplier much like English: 500 is पांच सौ, 1,200 is बारह सौ or एक हज़ार दो सौ — this part IS regular even though 1-99 isn't.
• India groups big numbers by lakh/crore, not by thousands. Price tags and speech group digits 2+2+3 from the right, not 3+3: 100,000 is written 1,00,000 (1 lakh), 1,000,000 is 10,00,000 (10 lakh), 10,000,000 is 1 crore. ₹250,000 is written ₹2,50,000 and spoken दो लाख पचास हज़ार ("two lakh fifty thousand") — never "two hundred fifty thousand". Expect this grouping on receipts, rentals and salaries.