Launching today
Whistle
A fitness coach with personalized plans
75 followers
A fitness coach with personalized plans
75 followers
Most workout apps give you a generic plan and call it personalized. Whistle actually knows you. It reads your Apple Health data and builds a real training plan around your fitness level, recovery, and goals. Detailed workouts, smart progression, all on your iPhone and Apple Watch. Whether you're just getting started or pushing toward a new personal best, your AI coach figures out what you need and when you need it. Your data. Your plan. Your pace.
Whistle
@clemens_vogelhaus Kudos on the launch. Could you maybe give a walkthrough of how it analyzes Apple Health? Like how does it understand our level of fitness or position in our fitness journey and our goals? Do we get to edit it?
Whistle
@swati_paliwal thanks and sure I can do that.
When you first set up the app, the coach asks for your fitness goals and ambitions before analysing your Apple Health data. For this, the coach has a range of tools it can use to access relevant information. Besides the basic data we can take straight from Apple Health, like workouts and basic metrics, we've also built a system of aggregated scores such as training load, recovery and more that the coach can rely on. Whenever the coach uses a tool to get a specific value, it also receives additional information alongside it to anchor that value in your own personal context. Based on that, it then creates a first plan for you to follow.
If you're unhappy with something the coach suggests, or you have additional requirements, you can just tell the app via the chat. We've built our own memory system to extract and store relevant information, so that over time the coach remembers your favorite days for working out, planned breaks or even the opening hours of the swimming pool you like to visit.
Once you're onboarded, this experience continues. When you want to plan a workout, you start a conversation with the coach and it will plan it for you. If you're unhappy, you just tell it and it updates the plan. If there's relevant information, it will extract that into the memory and remember it for next time.
I hope that answers your question.
Product Hunt
Whistle
Hey @curiouskitty ,
Whistle handles this through Coach tools rather than a hidden black-box rule engine. For example, before changing a week it can read the current plan, recent completed workouts, planned workouts, training load, sleep, recovery, and overnight vitals. If Thursday has intervals planned but the last few sessions already pushed load up, sleep has been poor, and recovery/vitals look off, Coach can propose a smaller change: move the hard session, reduce the interval volume, swap it for easy aerobic work, or move strength away from another hard day.
The important part is that plan changes are explicit. Whistle can adjust an existing workout, create a replacement, or remove a conflicting one, but those write actions go through user-facing approval/permission flows. The training program also stores coaching context such as progression, load strategy, recovery spacing, adaptation rules, and “what not to do,” so future planning turns preserve the intent instead of just reacting to one metric.
We’re careful not to frame sleep or vitals as medical diagnosis. They’re used as wellness and readiness context, alongside training history and the plan, to make conservative adjustments the user can review before applying.
Hope that answers your question,
Clemens
The personalized plan is the easy half. The hard half is week two, when motivation dips and people quietly ghost the app. I build habit and wellbeing tools, and the missed-day moment is everything... guilt-trip people and they churn, let them off too easy and the habit never sets. How are you handling the broken streak?
Whistle
When you miss a workout or a key session Whistle can easily adjust your plan around it. It's actually the biggest benefit compared to rigid training programs. We also plan to add additional features that we hope will increase motivation and help people stick to what they set out to achieve.
@clemens_vogelhaus Love that it bends instead of breaking. The piece I'd watch is the comeback moment... the tone when someone returns after a miss does as much for retention as the plan change itself. Good instinct, though. Nice one.
Congrats on the launch, the Apple Health-native approach makes a lot of sense. Quick question on positioning: how do you see Whistle fitting alongside something like Bevel? They read the same Apple Watch data, but Bevel mostly tells me how recovered I am and leaves the training calls to me, whereas Whistle sounds like it actually builds and rewrites the plan itself. Is that prescriptive side the main thing you're betting on?
Whistle
@ferdi_sigona yes, that's the key difference. The Bevel release was really exciting for us. We've been working on Whistle for more than a year now, and seeing it confirmed a lot of our assumptions. As far as we can tell, Bevel focuses on helping you make sense of your fitness and health data. Whistle is primarily a workout planner. It lets you create workouts, schedule them and send them to your Apple Watch so you get real-time guidance during your session.
The health data we show in the app serves two purposes: it gives you guidance, and it gives the coach relevant context. The coach itself is really just an additional layer that can do all of this for you. It can help you understand your health data, but where it shines is creating plans and workouts. When it plans a run, it doesn't just message you to say "go for a run." It actually schedules the run in alignment with your goal, your training load, your recovery, the weather and more, and it generates structured workouts, so a run might include intervals with specific heart rate targets or paces whenever that makes sense. With the same approach it can build plans across multiple months to prepare you for a race or to work toward a bigger goal.
Hey Clements, congrats on launching your venture! Question though: does the Wistle provides exercises or it only about running and biking?
Best
George
Whistle
Hey @gsostak ,
thanks! Whistle works best for endurance sports, but it can also generate strength workouts and provide exercise routines for home or the gym. Right now, though, the app just tells you to do a certain exercise for a certain number of reps and can't yet explain or show how to perform it correctly.
Hope that answers your question.
Clemens
Adidas Runtastic
I've been using it since the Beta and it actually helped me improve my performance, specially on cycling as I sucked at it lol
Whistle
Happy to hear it helped :D I am sure your cycling isn't that terrible
Stripo.email
Love the personalized progression system. Most apps just recycle the same routines regardless of recovery or fitness level.
Whistle
@marianna_tymchuk glad you like it!