Speed Comp
Music that keeps up with the ski
Fifty miles an hour into the wind with spray in your face is no place to reach for a volume button. Speed Comp turns your GPS speed into volume, so the speaker gets louder as you open up and settles as you slow to idle back in.
Any personal watercraft with a phone aboard — built-in audio, a strapped-on speaker, or earbuds under the helmet.
Both hands on the bars
A ski at speed is all wind and spray. The one thing you cannot do is let go to find a button.
No safe moment to reach
There is no point on a fast run where fishing for a phone is a good idea. Set the range before you launch and the app handles every throttle change.
Loud at speed, obnoxious at the dock
The volume that carries at 50 mph is a nuisance idling through the marina. Speed Comp drops back to your baseline as you slow.
Phone stays sealed
In a waterproof case, in the glovebox, screen off. The app runs in the background and shows what it is doing on the Lock Screen or in a notification.
Three moving parts
Set a speed range, start compensation, and go. Everything after that is automatic.
Pick your range
Choose the speed where compensation should start and the speed where it should top out — in MPH or KPH. Below your minimum, the app leaves your volume alone entirely. On a ski, try starting at about 10 mph — just past no-wake — and topping out around 45–55 mph.
Set your baseline
Tap start at a volume that sounds right while stopped. That level becomes the floor. Speed Comp only ever adds to it — it will never turn your music down below where you set it.
Ride
GPS speed drives the volume curve continuously in the background, screen off. A Live Activity on iPhone, or an ongoing notification on Android, shows it running — with a stop button always one tap away.
Set up for the ski
Built-in audio or a strapped-on speaker
If it plays from your phone over Bluetooth, the level the phone sends is what Speed Comp moves. The ski's own volume control applies on top, so leave it where you like it.
Try it on the trailer
The built-in simulation ramps a fake speed from zero to your maximum through the same path as GPS, so you can hear the whole curve before the ski is wet.
A profile for the ski, one for the boat
Different top speeds, different curves. Plus keeps three saved profiles; Pro keeps as many as you like.
What it looks like
The same app on iPhone and Android: a speed, a volume, and how much the app has added.
Running
Speed, volume and the amount added, with a stop button.
The curve
Two speeds do all the work; between them the volume climbs steadily.
The floor
Your starting volume is the floor. The app only ever adds to it.
Free to use, for as long as you like
Speed compensation is not a trial and does not expire. The only limit without a subscription is that each session runs for up to two hours, then stops — start it again and you get another two. A subscription lifts that limit and adds the extras below.
Free
No account, no ads, no expiry date.
- Full speed-to-volume compensation
- Two hours per session, restart as often as you like
- Speed simulation for tuning while stopped
Plus
Everything in Free, without the session clock.
- No session time limit
- Up to three saved profiles
Pro
Everything in Plus, plus the audio extras.
- Unlimited saved profiles
- Smooth gain between volume steps
- Now-playing display with transport controls (Apple Music on iPhone)
Where your data goes
Speed Comp needs precise location because that is the only way a phone knows how fast you are moving. It does not follow that the app needs to keep it, and it does not.
- Your location never leaves your device. Speed is read, turned into a volume, and discarded; no location history is kept, not even on the phone.
- No ads, no advertising ID, no tracking, no account.
- Anonymous usage analytics only — which screens are opened, whether a session or a purchase went through. The policy lists every event.
Questions from the water
Does it work with the Bluetooth audio built into newer skis?
If your phone is what plays the music, yes. Speed Comp moves the phone's media volume — the level your phone sends over Bluetooth — so any speaker, headset or built-in audio system that is playing from your phone follows along. A device with its own volume knob applies that on top: leave it where you like it and let the phone's level do the moving. What the app cannot reach is a stereo playing its own source, such as FM radio or a USB stick.
Does a waterproof case or pouch get in the way?
No. GPS and Bluetooth both pass through a case, and the app never needs the screen while it is running.
Is GPS speed accurate enough on the water?
Yes — GPS wants a clear view of the sky and a ski has nothing in the way. It measures speed over ground, the same figure a GPS speedometer shows.
Will it keep running with the phone sealed away?
Yes. On iPhone the app keeps receiving location in the background and shows a Live Activity on the Lock Screen with a Stop button; on Android it runs as a foreground service with an ongoing notification, also with Stop. Screen off, phone sealed away — it keeps working.
Will it ever turn my music down below where I set it?
No. The volume you have when you start compensation is the floor. Speed Comp only ever adds to it, and comes back to exactly that level when you stop moving.
Set it once, before you launch
Free on iPhone and Android. Pick a range on the trailer and keep both hands on the bars.
