4Level
Stick to your resolutions
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
For ambitious amateur athletes: one honest fitness level from your Apple Health workouts — and a clear view of whether you stick to your own training resolutions.
4Level is made for ambitious amateur athletes who already train regularly and want to know: How fit am I really — and am I sticking to what I set out to do?
WHAT 4LEVEL IS — AND WHAT IT IS NOT
4Level analyses the workouts you already record. It does not create training plans, workouts or coaching advice and does not replace a coach. You decide how you train; 4Level measures, explains and keeps you honest.
YOUR LEVEL, 1 TO 100
One number from three building blocks:
• Fitness — your training load of the last six weeks (CTL)
• Capacity — running VO₂max (VDOT) or cycling watts per kilo
• Consistency — how regularly you train and, once you set your resolutions, how faithfully you keep them
Calculated for every single day back to your first workout, using only what was known on that day. Every value shows whether it was measured or estimated; the whole formula is explained in the app.
STICK TO YOUR RESOLUTIONS
Set per sport — running, cycling, hiking, swimming, strength — how often and on which days you intend to train, or train as you feel like it. Add weekly, monthly or yearly kilometre targets if you like (not for strength). 4Level shows whether you are ahead or behind right now, a 26-week heatmap, your streak in weeks and your month balance. Flexible by design: ran Monday, Tuesday and Saturday instead of Monday, Wednesday and Friday? The week still counts. Measured retroactively for the last 26 weeks if you want.
LOAD, FATIGUE AND FRESHNESS
Fitness, fatigue and freshness (CTL, ATL, TSB) show whether you are rested, building or overloaded. Race predictions for 5 km to marathon come from your runs of the last 120 days: pace and, if you record it, heart rate.
RUNNING, CYCLING AND HIKING
Yearly goals with a marker where you should be today, this year against last year and your best year, weekly volume, records, all years at a glance. Plus a searchable list of all your workouts.
WORKS WITH THE APPS YOU USE
4Level reads from Apple Health — everything your Apple Watch, Garmin Connect, Strava, Zwift, Wahoo and other apps write there. You choose per sport which app's recording counts; the same session recorded twice counts once, and missing heart rate, climbing or power is filled in from the other recording.
PRIVATE BY DESIGN
No account, no server, no analytics, no ads. Data is read from Apple Health and stays on your device.
PRICING
30 days free with everything included. Afterwards 4Level Pro: a yearly subscription (renews automatically, cancel anytime in your Apple Account settings) or a one-time lifetime licence.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
The level is a training aid, not a medical assessment. Try the demo without any data.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
4Level 1.2
• Month labels right in every time zone: the “Year against year” chart showed the previous month west of UTC, for example “Dec” instead of “Jan”.
• Plan changes on the right day: in “My plan”, “Change applies from” could show the day before or after, depending on time zone and time of day. It now always shows your local date.
The developer, Robert Poetzsch, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert Poetzsch
- Size
- 7.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.1 or later.
- iPhone
Requires iOS 26.1 or later. - iPad
Requires iPadOS 26.1 or later. - Mac
Requires macOS 26.1 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.1 or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Italian, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- 4Level Lifetime $8.99
- 4Level Pro Yearly $1.99
- Copyright
- © 2026 Robert Poetzsch