Now available on the App Store for iPhone and iPad, Just The Watts is a purpose-built app for cyclists who train indoors on the trainer. Whether you’re grinding through base miles or hammering out intervals, this iOS-exclusive app turns every session into a focused, data-driven workout.
Designed for the indoor training experience, Just The Watts delivers structured cycling workouts that help you build power, endurance, and efficiency without wasting a single pedal stroke. Say goodbye to guesswork and hello to targeted sessions that align with your training goals.
With seamless Bluetooth integration, the app connects directly to your power meter, cadence sensor, speed sensor, and heart rate monitor — giving you real-time performance data as you ride. Whether you’re chasing PRs or holding zone 2, you’ll train with confidence and precision.
No power meter? No problem. Just The Watts supports virtual power, allowing you to estimate your power output by connecting a Bluetooth speed sensor and selecting your specific trainer model. It’s an easy and affordable way to start training with watts and track your effort with real data.
Best of all, you can create fully customized workouts based on your Functional Threshold Power (FTP). Build your own intervals, fine-tune intensity and duration, and craft workouts that match your goals and fitness level — all from your iPhone or iPad.
Frequently Asked Questions
Why?
This app was created purely out of my own necessity/desire for a simple application that I could use with my “dumb” bike trainer that would provide me with a virtual power number that I could use to create structured workouts to train with, and provided a satisfying user experience. Hence, Just The Watts was born.
What equipment Is required?
All you need to get started using JTW is a bike (duh), a bike trainer, a bluetooth speed sensor, and either an iPhone or iPad.
Can I connect my power meter?
Yes! After seeing that many potential users already have a power meter, or smart trainer, that still want a simple solution to structured trainer workouts I have spent the time to build power meter support into the app. You can now connect your power source via bluetooth to Just The Watts and record power, cadence and speed, all from one source.
Virtual power is great, but what are some other features?
With JTW you have the ability to create custom workouts based off of your FTP to add structure to your training. You can also link your Strava account and upload workouts directly after finishing.
What if I want a copy of my workout?
JTW does create a .FIT file for every completed workout. These can be retrieved by plugging your iPhone/iPad into a computer and accessing the JTW file folder with either iTunes (Windows), or Finder window (Mac).
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