Startlight Apple Watch app

The Startlight Apple Watch app answers one question from your wrist: what iRacing session is running now, what’s next, and how long until it starts. A live countdown ticks down once per second, so you know whether to register for this timeslot or wait for the next one without alt-tabbing out of the sim or grabbing your phone.

What the watch app shows

Per series, the watch face shows the race-week number (W#), the current session phase, and a countdown to the next session start. The phase is one of practice, qualifying, grid, or race, and the countdown is the same time-to-green the iOS widget shows, updated every second from a Timer publisher while the app is on screen.

The background carries the series short name and current track name over a car image with a faded track-map overlay, so you can tell at a glance which series you’re looking at. The countdown is built on iRacing’s fixed timing: sessions repeat on a set interval (commonly every 30 minutes), and each timeslot runs practice, then qualifying, then a hardcoded 2-minute grid, then the race, then dead time before the next slot opens.

Cycling through your series

Tap the face or use the navigation dots to flip between the series you track. The index wraps, so the dot past the last series brings you back to the first, and the indicator dots show your position in the list. You pick which series appear; the watch shows only those.

How it stays in sync

You choose your series on the iPhone, and the selection syncs to the watch over WatchConnectivity. The first time you open the watch app it shows “Open Startlight on your iPhone to sync data,” then requests fresh data from the phone whenever it’s reachable.

When the phone is out of range the watch falls back to its own cache, which holds series data for 30 minutes (shorter than the widget’s one-hour cache). If the cache is stale and the phone still isn’t reachable, the watch fetches directly from the API server itself. Before any sync ever happens, it shows three default series: ARCA Menards, Skip Barber Race Series, and VRS GT Sprint. Which series you can track and how the schedule data is sourced is covered in the supported series and FAQ.

Why glance at your wrist instead of registering blind

The countdown tells you when you can join and when signup closes, and that’s the moment that decides your night. Outside NA peak hours a split doesn’t always fill: depending on the track and time of day, some F4 or TCR timeslots won’t draw enough drivers to go official, so knowing the exact timeslot is the difference between a counting race and a wasted hour. EU and AU racers live with this; the countdown shows when the next viable slot opens instead of guessing.

For endurance teams that coordinate around named timeslots (“Timeslot #2,” “Sunday 13:00 UTC”), being on the wrong minute means missing your stint. A glance at the wrist confirms you’re handing off at green, not 30 minutes early. iRacing runs a 12-week rotating track schedule across four seasons a year (each season starting the Tuesday after a quarterly build deploys in the first or second week of December, March, June, and September), so the week number on the watch also tells you which track is up.

Setup

Startlight is a single $9.99 purchase: the iOS app, the Home Screen widget, and the Apple Watch app all come together. The watch app is a companion target, not a separate buy.

Buy it on the iPhone, open the app once so it syncs your series over to the watch, and the app appears on your paired Apple Watch. The watch needs to be paired to the iPhone that owns the purchase.

What it doesn’t do

The watch app is a schedule glance, not telemetry. It won’t show your lap times, fuel, or position mid-race. It’s built for the pre-grid moment, when you’re deciding which timeslot to register for and when to be ready.