How loud it is, and how long you have.

The sound around you as one big number, A-weighted like a proper meter, with a plain-words band under it: Quiet, Moderate, Loud, Very loud, Dangerous. At 98 dB the screen says a gig, a club - minutes, not hours.

Under the meter, how long ears can take the room from now - unprotected, behind musician's plugs, behind foam - side by side, so what a pair of plugs buys you is a number rather than a feeling. Any pair you add yourself joins the same table.

The other question: not how long you have in this room, but what a night you have not gone to yet would cost. Pick where you are going - a loud bar, a club, a gig up front, or any level from 75 to 110 dB - and how long you will be there, and Din runs the same maths forward against what today's budget has left. It names the lightest protection that keeps the night inside it, and for the ones that do not, how far from the end you would go over. Free, because whether to put plugs in your pocket is a safety decision.

Tap I'm staying and Din holds the measured level and counts down to the moment the day's budget runs out, with a ring for how much is already spent. Tap I left and the night is saved to the log. If the allowance does run out, the screen says so and states when it resets, rather than going quiet at the moment the number stops being comfortable.

Tell Din when plugs go in or come out and re-measure when the band comes on, and the countdown follows every change. The maths never applies protection to sound you already heard without it.

Add the pairs sitting in your coat pocket by the SNR or NRR printed on the packet. Din derates the rating the way it derates its own figures - an NRR loses 7 dB for the A-weighted correction, then two thirds of what is left is counted, and nothing is credited above 25 dB. A pair rated SNR 30 comes out at exactly the 20 dB Din uses for generic foam, which is the point: the same rule, applied to your plugs instead of a category. They then appear everywhere a protection is picked.

Decline the microphone and sessions start from a typical-venue estimate instead - a loud bar, a club, a gig up front - and everything else works the same. The meter is the best way to use Din, not the price of entry.

Every session by day: the level, the duration, what was in your ears, and the share of that day's budget it cost. Name the night when you leave - Gig, Club, Bar, Cinema, Work, or anything you type - and the column of percentages becomes a record of where you were. Labelling is free; the free app keeps seven days of history, Din Pro keeps all of it.

A Live Activity carries the time you have left to the Lock Screen and the Dynamic Island, so the phone stays in your pocket at the gig and checking your ears does not mean unlocking anything.

A notification before the day's budget runs out, so plugs go in while they can still make a difference. Time-sensitive, so it reaches you through a Focus; scheduled locally on your phone.

Start and end a session from Siri, a shortcut or an automation - arriving at a venue can start one without you opening anything, and without Din itself ever touching your location. Both open the app on purpose: the meter only listens on screen, and Din will not claim to measure a room it is not looking at. Asking how long your ears have got is answered without opening the app at all, and that one is Pro - it is the widgets' data by another door.

Your iPhone already records headphone listening, and an Apple Watch records the noise around you. Din reads both from Health and sums them against the weekly allowance, day by day. Widgets keep the budget in sight in four sizes - the share left on the Home Screen, a wider one carrying the live countdown and what is in your ears, and two more for the Lock Screen.