App for smart trainers
4000Watt. Not a game.
Just results.
Every day, training that actually delivers. Today’s form, recent load, time available — that’s what the workout is built from.
Starts at release on 22 October. Waitlist only.
The email address is used only for the waitlist and can be removed at any time. Details in the privacy policy.
Release
22 October 2026
Not a Game
A virtual world has no job in a workout.
The Smart Trainer sets the power target in a workout. The hill on screen doesn’t make it harder, the draft doesn’t make it easier.
The world still demands attention. And it takes it exactly where it’s needed most: in the hardest interval. 40 seconds to go, legs all out, and on screen the avatar rolls on like everyone else. Anyone looking away in those minutes is wasting them.
The 4000Watt training screen gives that attention back. In the centre, the power being produced right now. Beside it, the heart rate pulses with every beat. And when there’s nothing left, the pain becomes visible. Seeing it is what keeps the legs turning.
The body motivates. 4000Watt makes it visible.
DayCheck
The flashiest workout is rarely the right one.
Without a training plan, every workout starts with a decision. The library holds hundreds of workouts, and none of them says whether it fits today. So the eye decides.
The choice always lands the same way. Too much intensity, too little base, the same three favourites. The same stimulus on repeat. Four months of training, no progress — and nobody knows why.
The 4000Watt DayCheck asks about today’s form, legs and time. And it factors in the past few weeks. After two hard days, no third round of intervals. After a week of base, not another Zone 2 workout. The result: three suggestions that fit today.
The right workout, every day.
DayCheck
Prior loadRecovered
Focus on Progress
Progress stays invisible for weeks.
Training is meant to bring progress. For weeks, nothing shows whether it does. Workout after workout, and none of them tells you if it worked.
Progress is measured by FTP. That takes an all-out test. In between, there’s no number. And base training, the biggest part of your training, shows up there last.
If you can’t see progress, you start to doubt. The easy workouts are the first to go. You ride harder, because only that feels like training. Then the foundation is missing.
Yet something changes before an FTP test shows it: your heart needs fewer beats for the same watts. The 4000Watt WP Index turns that into a number: watts divided by heart rate. It’s measured along the way, in an easy Zone 2 workout. There’s nothing to start and nothing to set up. The workout runs in the foreground, the measurement in the background. At the end, there’s a new value in your trend. That’s how progress becomes visible, week by week.
Measure progress without testing.
WP Index
avg of the last 5 Zone 2 workouts
Same power. 8 beats fewer.
ADAPTIVE TRAINING PLANS
The plan only knows the rider it started with.
A training plan sets the order: base, intensity, recovery. It is written on one day and holds for weeks. Sooner or later, days get missed. The plan stays put.
That leaves two options. Rebuild it by hand — except no one knows which workouts still build on one another, and the order is exactly what gets lost. Or stop.
4000Watt recalculates the plan. One missed day shifts the workout. Several shift the week. When the gap grows, the adjustment reworks the phase itself.
The plan adapts. Not the rider.
Current week
Training Plan is adapting
Next week
FTP TEST
FTP is probably wrong.
Structured training is built on one number: FTP, the highest power sustainable for an hour. It is usually measured with a 20-minute test. Yet to this day, the test is scored with one standard formula for everyone.
If the number is too high, every interval becomes an ordeal. If it is too low, everything comes easy. That feels wrong too — it just takes months to show.
Either way, the training happens in the wrong zone. The body never gets the stimulus the workout was built for.
4000Watt analyses this test more closely. How stable the power stayed over the 20 minutes, and how the heart rate responded, together produce an FTP that fits this rider exactly.
Effective training starts with an accurate FTP.
FTP Test 20 min
New FTP
Avg heart rate
Progress
VIDEO MODE
Not every workout demands full attention.
During intervals, the screen comes first. Target power, time remaining, heart rate — something is happening there that needs to be seen. A steady workout holds the power constant, and the eyes are free. In 4000Watt video mode, a documentary on YouTube or a favourite series on Netflix runs on the same screen. The performance data stays visible; the smart trainer keeps holding the target power.
Good entertainment stays a choice.
Windows app only.
MARKET COMPARISON
Four platforms compared
Prices from the providers’ public pricing pages, as of August 2026.
Price
30 days free. Then €9.99
Monthly
9.99 € / month
Billed monthly.
All features. No ads. Prices include VAT.
Questions
Which smart trainers are supported?
A smart trainer with ERG mode and Bluetooth is required. That covers practically every model since 2016, including Wahoo KICKR, Tacx Neo and Flux, Elite Direto and Suito, Saris H3, Zycle and JetBlack. Trainers without electronic resistance control are not supported.
Does the Zwift Ride work with 4000Watt?
Yes. Control runs over FTMS, the open standard for smart trainers. Power and cadence are read straight from the trainer, and 4000Watt sets the target power.
The Zwift Cog and its single sprocket stay on the bike and work exactly as before. Virtual shifting on the Zwift buttons isn't needed during workouts: every workout runs in ERG mode. There the smart trainer holds the resistance at the target power on its own — whichever gear is selected.
For free sections such as the FTP test, 4000Watt works out the right gear ratio and sets the resistance to match weight and target power. The virtual gear can be adjusted on screen mid-ride.
Which systems does the 4000Watt app run on?
- Windows
- Windows 10 (64-bit, version 22H2) or Windows 11
- iPadOS
- coming soon, version 17 or later — iPads from 2018 onwards. No iPhone
- macOS
- coming soon
- Android
- coming soon
Is the 4000Watt app required?
For training, yes. Control of the smart trainer runs over Bluetooth and is tied to the app. Planning, analysis and history are also available in the browser, on any system.
What are the PC requirements?
- Processor
- Dual-core, 2015 or newer
- Memory
- 8 GB
- Free disk space
- 500 MB
- Display
- At least 1280 × 680
A dedicated graphics card is not required.
How does the trainer connect?
Directly over Bluetooth. No ANT+. PCs without built-in Bluetooth need a USB adapter.
Is a heart rate sensor required?
No. Without heart rate data, some features are unavailable, including the recovery heart rate test and the WP Index.
Which heart rate sensors are supported?
Any sensor that broadcasts as a Bluetooth heart rate sensor. That includes chest straps such as the Polar H10, Garmin HRM-Dual and Wahoo TICKR, and watches from Garmin, Polar and Coros with broadcast mode enabled. The Apple Watch does not broadcast as a Bluetooth sensor — it can only be connected through an additional app on an iPhone running at the same time.
Does the 4000Watt app need an internet connection?
Yes, at all times. Without an internet connection, the 4000Watt app does not start.
Are workouts uploaded to Strava?
The Strava connection is optional and works in both directions. After every workout, the upload is up to the rider. Outdoor rides come back into 4000Watt and count towards the training load.
Starts at release on 22 October. Waitlist only.
The email address is used only for the waitlist and can be removed at any time. Details in the privacy policy.