ShiftSail · Racing tactics for iPhone, iPad and Apple Watch
ShiftSail · iPhone, iPad and Apple Watch

Every shift. At a glance.

Try it outLive demo in your browser Download on the App Store
1 s
to read the wind shift
60 pt
touch targets, made for gloves
±1.5 s
start accuracy with phone GPS
0
accounts, ads or tracking

A tactics app reduced to what the tactician needs. The start, the shifts, the laylines. Nothing else.

Live demo · runs in your browser

Try it out. No download.

This is the real interface, running on simulated data. Sail a beat in a shifting wind and watch the meter, the laylines and the track. Then time a start: a simulated boat sails the same sequence next to the phone, so you see what BURN, SPEED and STEADY mean on the water.

Start the simulation Open full screen
1 · The beat

The auto tactician tacks on the headers. Switch it off and press TACK yourself to see if you can do better.

2 · The start

Ping the pin, start the countdown and follow the boat to the line. Turn on sound for the beeps.

On a phone?

The demo stacks: controls first, then the phone, then the start area and the watch.

01 · The start

Burn, speed or steady.

Ping both ends of the line and start the countdown. One color band tells you what to do, readable from the corner of your eye. The beeps play even in silent mode.

  • Distance to the line and seconds early or late
  • Countdown on the lock screen and in the Dynamic Island
  • Start and sync with the Apple Watch
Try the start live
02 · The beat

Lifted or headed. And when to tack.

A meter compares your course now with your average on the last tack. Laylines on the map and the time to the layline show how much room you have left. No instruments needed.

  • Track drawn as lift, header or neutral
  • A short card after each tack: angle, shift, speed
  • Ping marks at the buoy when there are no coordinates
03 · After the race

Every tack, measured.

Like a pit stop: meters lost, lowest speed and the time back up to speed. Replay the race, or export it for a deeper look with an AI on your computer.

  • Best and worst tacks, port against starboard
  • Replay with a scrubber, track by shift or speed
  • Export for Claude, ChatGPT, mail or AirDrop
04 · iPad

The big screen for the whole crew.

On many boats the iPad sits at the companionway or on the mast, where the helm and the tactician can both see it. ShiftSail on iPad is built for portrait, with bigger numbers and more map. It works in landscape too.

  • The full race screen, start timer and race review
  • One Pro subscription covers iPhone, iPad and Apple Watch
  • Boats and races sync between devices through iCloud

On your wrist. Hands on the sheet.

The watch shows the shift, buzzes when it's time to tack and runs the start with the Action button or Double Tap.

Accessories

Set up the boat.

Waterproof cases, mounts for phone and iPad, Bluetooth GPS for a sharper start and a wind sensor for ShiftSail Pro.

See all accessories
Waterproof casesFor iPhone and iPad MountsOn the mast or at the companionway Bluetooth GPSTen updates a second Wind sensorEvery shift, at once

Questions sailors ask

More answers on the support page.

Is ShiftSail allowed when I race?

The racing rules allow electronic aids, but class rules and sailing instructions can limit them. Some one-design classes allow only a timer and a compass. For those, turn on class-legal mode in the boat profile and ShiftSail shows only what your class allows. Always check your class rules and the sailing instructions.

Do I need instruments or an account?

No. ShiftSail works with the phone's own GPS and needs no account. A Bluetooth GPS gives a sharper start, and ShiftSail Pro can read a Calypso wind sensor, but neither is required.

Does it work without mobile coverage?

Yes. GPS works without a mobile network. Download the map for your sailing area at home, and everything works offline on the water.

How long does the battery last?

ShiftSail is built to last a race day. Below 20 % it switches to power saving: the screen dims and GPS works less between legs. For long races, keep a small power bank in the waterproof case.

Which boats is it made for?

Keelboats and handicap racing, such as SRS and LYS. You set your boat's type and length, and ShiftSail learns its tack angle and speed from how you sail. The start timer works in any boat.

Do I need an Apple Watch or an iPad?

No. Everything works on the iPhone alone. The watch and iPad are extras, and one Pro subscription covers all three.

Can I cancel Pro?

Yes, anytime in your Apple account. The free version keeps working: start timer, start line, wind check and one boat.

Choose your ShiftSail

Start for free. Go Pro for the tactics. Try Pro free for 7 days.

ShiftSail
Free
  • The full start timer with sounds, also at clock time
  • Start line, wind check and one boat
  • Apple Watch, lock screen and Dynamic Island
Download on the App StoreComing soon
ShiftSail Pro7 days free
39.99 USDper year, or 7.99 USD per month
  • Everything in Free
  • Lift and header meter, laylines, time to layline, next-tack arrow
  • Race review with replay, tack analysis and export for AI
  • Several boats, Bluetooth wind sensor, iCloud sync
  • One subscription for iPhone, iPad and Apple Watch
Start 7 days free · Coming soon
Prices in your local currency in the App Store. Cancel anytime in your Apple account.

About ShiftSail

ShiftSail is a racing tactics app for iPhone, iPad and Apple Watch, developed in Sweden. It gives the tactician three answers at a glance: when to start, whether the boat is lifted or headed, and when to tack. After the race it measures every tack and lets sailors replay and analyse the race. ShiftSail works with the phone's own GPS, needs no instruments or account, and is built to be used with gloves on, in spray, in a split second.

[PHOTO]
JÖRGEN
Built by a racing sailor in Stockholm.
Jörgen Lannerstedt, founder · Medcontent

Press: press kit · jorgen@medcontent.se