Plan the week Build a training week around your goals, available time, recovery, and upcoming conditions.
Generic plans don't win races
Whistle helps you plan, adapt, and understand your training, from running, cycling, and swimming to everything in between. Built around your body, your schedule, and your goals.
Download for free
Meet your coach
Ask Whistle to plan your week, adjust a workout, review your progress, or explain what your body is telling you.
Plan your weekAdjust your workoutsReview your progress
Daily Summaries Start the day with a plan, get useful context when things change, and understand what your training means by the end of the day.
Review your progress Your Coach helps you look back on your training so you can make better decisions going forward.
More than raw data Raw metrics only tell part of the story. Whistle processes your health and workout data into higher-level signals, then enriches them with established health guidance to help your coach make better training decisions.
Short-lived processing Whistle only uses the data needed for the coaching task at hand. When cloud processing is required, it’s handled temporarily to generate a response, not stored as a long-term personal profile.
Train one step ahead
See how your workout, recovery, and forecast come together before you head out.
Training Load Track how much work you’re actually absorbing so it’s easier to balance effort, recovery, and consistency.
Projected load See how your planned workouts are likely to shape training load across the week before it happens.
Overnight signals Whistle looks at your sleep, recovery, and vital trends to give you an early read on how ready your body is today.
Weather Designed for workout planning the weather helps you know the best slots for outdoor exercise at a glance.
Performance, forecast Whistle estimates how a workout is likely to feel before you start, using your recent training, recovery, and current conditions.
Everything you need to train well
Plan workouts, reuse your favorite sessions, track from your wrist, and understand what your training is doing over time.
On your wrist, set, go! Send upcoming workouts to your watch and start them from your wrist.
Works with Apple’s Workout app Send Whistle workouts to Apple Watch and start them from the familiar Workout app experience.
Workout Statistics Review distance, duration, effort, heart rate, pace, power, elevation, and how each session compares to your usual training.
Custom Workouts Build structured sessions with blocks, steps, goals, and targets for running, cycling, swimming, and more.
Templates Save workouts you repeat often, then schedule them again in a few taps.
Works with Apple Watch Your planned Whistle workouts can show up on Apple Watch, ready to start when you are.
Works with Apple Health Whistle can use your workouts, recovery, sleep, heart rate, and activity data to make training guidance more personal when you choose to share it.
Hallo! Nice to meet you
We made Whistle, we use it every day, and we're the ones who'll reply if you ever reach out.
We are nerds.
We build for awe, not engagement. For moments of clarity, not hours of scrolling. We want our apps to make your day a little better.
We believe your data is yours. It stays on your device, not our servers. We don't track you. We don't sell you. We don't even want to know who you are. We just want to make something useful for you.
We build software that lasts. No subscriptions that hold your data hostage. No growth hacks that prioritize metrics over people.
We optimize for stories, not profit. For the person who tells a friend, not the metric that impresses investors. We'd rather have a thousand people who love what we make than a million who feel trapped by it.
We're small on purpose. No investors. No growth targets. No trend chasing. Just two friends building software we'd want to use. That's it. That's the company.
Florian
Clemens
Got questions?
What is Whistle?
Whistle is an AI coaching app for planning, adapting, and understanding your training across running, cycling, swimming, strength, and more.
Is Whistle only for triathletes?
No. Whistle works well for athletes who run, ride, or swim, but it is built more broadly for people who want smarter workout planning and training guidance.
How does the AI coach personalize my plan?
When you choose to share data, Coach can use your workouts, recovery, sleep, training load, schedule, saved templates, and local weather to build more useful recommendations.
Can Whistle create structured workouts?
Yes. You can ask Coach to create runs, rides, swims, intervals, goal-based workouts, pacer workouts, and multisport sessions, then schedule them in your plan.
Is my health data private?
Yes. Whistle uses your data only when you choose to share it for features like coaching, summaries, and training insights. You stay in control of what the app can access.
Can I use Whistle without AI?
Yes. You can plan workouts manually, reuse templates, view your training week, check workout weather, and track from Apple Watch without using Coach. AI is there when you want help planning, adjusting, or reviewing your training.
Get a workout plan built for you
Plan workouts, adapt your week, and get coaching that understands your training, recovery, schedule, and weather.