Training Readiness
for Endurance Athletes
As a product designer and athlete, I approach both with obsessive attention to detail and intention behind every decision. The Outsiders reflects that. Every metric serves a purpose, every button has intent. We focus on the data that matters - metrics that give you a clear understanding of your fitness and help you make smart training decisions. The interface follows the same principle: thoughtful layout, actionable insights, nothing unnecessary.
— Andrej, Co-founder & Designer
“

Connect to Apple Health and your workout history loads automatically. The best part? Deep analysis showing how each session impacts your training.

All analysis happens on your iPhone. Your personal information belongs to you, not to AI models or ad platforms. No user accounts. No servers.
Makes your Apple Watch Useful

Jan 20, 2026 - OP3080
I seriously debated getting rid of my Apple Watch before finding this app. Apple collects TONS of data but doesn’t do anything with it. This app changed how I train and how I use my Apple Watch. It’s clear the data it gives me and what that data means. I would recommend this to anyone that considers themselves an athlete. If you are wanting something less intense go check their other app, Gentler Streak
Insightful and well designed

Nov 26, 2025 - olksij
Everyone in fitness will find it useful. You can check metrics Apple Health would never show. The “Readiness” score is a chef’s kiss! Underrated app, deserves attention!
Best app ever!

Oct 23, 2025 - Cyclingislife87
Just the app I was waiting for! It has all the advanced metrics I need to plan my workouts and analyze them to get the best results without the fear of overtraining. Amazingly designed interface, just like their other app, Gentler Streak. You can’t go wrong with this team!
Beautiful

Oct 2, 2025 - D xxxxxxxxx
I haven’t even started to use all the features of this app, but OMG is this app absolutely beautiful. The artwork, color palettes and gradients , and design elements are all jaw dropping.
Great today and very promising future

Sep 18, 2025 - HipHapa
Anyone can regurgitate data from Apple Health, but this team knows UI and UX. They make health data accessible and understandable, and then translate that into usable guidance to achieve your training goals. It’s still early days for this app, but it’s an amazing start! I’m looking forward to using this app for a long time to come!
Wow!

Jan 28, 2026 - Jeremy Kanter
This app is really useful and beautiful, and most importantly the readiness rating actually seems to align with how my body is feeling. I’m eagerly awaiting the introduction of widgets so that I can delete the app I was using before this. :)
No nonsense tracking

Jan 28, 2026 - Jfedhkitvvswgj
I stated out using Gentler Streak, this company’s first tracking app. It was (and still is) a useful and supportive app that encourages healthy habits. The Outsiders is more objective and data-driven. No flowers or rainbows, just actionable numbers. It is still encouraging, though, which is good. It runs only off the data from my Apple Watch and doesn’t store anything itself. That’s a nice feature. Overall a really useful app.
Keeps getting better and better

Jan 22, 2026 - Jcokacola
I have to say that I love seeing all the updates that keep coming and coming. The watch app has really step up and I love using the complications. would like to see a bit more feedback using the AI option all the apps have and a better understanding of my body battery plus more info on my stress level.
Love the app and the potential

Jan 17, 2026 - CandianWiteout
The developers really care about the app, the experience, are always open to feedback and constantly updating. Love the focus on the readiness score, doesn’t try to do everything but keep you prepped for training.
A great app!

Jan 16, 2026 - Lankaward
The Outsiders: Athlete Tracker is a great app, because this app really helps you get started with moving, the design is very clean and there are no bugs I’ve seen so far. And although it’s clean, there is still so much info about your body to look at. A great app, 5 stars!
Best and most easy to understand Fitness App for iOS!

Nov 21, 2025 - NckIg
I have been using many different apps over the years (Whoop, Athlytic, Bevel). But this one beats all of them in terms in making all the data points and readings you get easy to understand and actionable. 100% recommend to try this out, especially if you use an Apple Watch and are tracking both fitness activities and recovery!
One more hit from the GS family!

Nov 8, 2025 - Evil teacher34
Looking for another simple way to take your training to the next level without messy and confusing ideas or info? Look no further.
Great for serious training

Oct 21, 2025 - cattuccin0
It’s helped me finally understand when to push and when to pull back not just log workouts for the sake of it. The interface is super clean (and sexy af!!), the insights actually make sense, and you can tell it was built with athletes in mind. If you’ve got an Apple Watch and want something smarter than your average run tracker, this is it. Well done! 👏👏
































































