ZeroTo: 0-60 & Drag Timer

Mount your iPhone, stage, launch. ZeroTo times 0-60, 0-100, the quarter mile and every gear shift, and shows how much to trust each run.

Your iPhone is the timer. ZeroTo measures 0-60 mph, 0-100 km/h, the quarter mile and every gear shift, with no GPS box to buy.

HOW A PASS GOES Mount the phone, pick a class and tap Stage. The start tree lights as the GPS locks and the car settles. Launch when it's safe. Timing starts the moment the car moves and stops by itself, and short beeps call each step, so you never touch the phone on the move. For the full ritual, turn on the tree's ambers, which leave time to spool the turbo.

WHY THE NUMBERS HOLD UP GPS updates about once a second, too slow to catch a launch. ZeroTo also reads the motion sensors 100 times a second. They catch the first inch of movement and fill the gaps, and GPS keeps the speed honest. Every pass gets a lamp: accurate, approximate or not accurate, with an error estimate, so a time on a downhill or with weak GPS never passes as a clean one.

ON EVERY SLIP

• 0-60 mph, 0-100 km/h, 1/8 and 1/4 mile with trap speed
• Road slope from the barometer
• Speed trace, pull and gear shifts: how long each shift took and what it cost
• Your previous pass in the same car, side by side
• A map of the pass and of every place you ran

CLASSES Sprint 0-60 (0-100), Long 0-130 (0-200), Rolling 60-130 (100-200) and a Full pass that measures everything at once.

WHILE YOU DRIVE The Lock Screen and the Dynamic Island show the lamps and the speed. The Apple Watch can start and stop a pass from your wrist.

SHARE IT Turn a pass into a poster or a short video for Stories and chats.

FREE AND PRO Every pass is timed the same way for everyone. Free covers the classics above with no limit on passes. ZeroTo Pro is a one-time purchase, not a subscription, and adds:

• Long and rolling classes, 60 ft, 1/2 mile and rollout times
• Every gear shift in detail, compared pass to pass
• Any number of cars with notes for each tune
• Unlimited history and CSV export
• Posters and videos without the ZeroTo mark

PRIVACY No account and no ads, and nothing is tracked. Your passes stay on your iPhone.

Use ZeroTo only on closed roads or tracks where it's legal, and follow local laws.