Intervals.icu is a serious training-analysis platform — power and heart-rate curves, fitness/fatigue modelling, a workout builder and a training calendar. If you follow a structured plan, it is a better analysis tool than ActivityStat and this page will not pretend otherwise. The question is whether you want a second platform to visit, or your numbers on the activity you already posted.
| Feature | Intervals.icu | ActivityStat |
|---|---|---|
| Writes stats into your Strava activity description | — | Yes — automatically, on every activity |
| Stats visible in the Strava mobile app | — | Yes |
| Requires visiting a separate site to see your data | Yes | No |
| Structured workout builder | Yes | — |
| Power / HR curve analysis | Yes, extensive | Power and cadence in context |
| AI-written activity descriptions | — | Yes |
| Best suited to | Structured training | Everyday logging |
Compiled from Intervals.icu’s publicly documented features and last reviewed on August 10, 2026. Products change — check Intervals.icu for their current details. If we have something wrong here, tell us and we’ll fix it.
They answer different questions. If you are following a structured training plan and want to analyse power curves and modelled fitness, Intervals.icu is the stronger analysis tool. If you want your key numbers to appear on every Strava activity without opening anything, that is what ActivityStat does. Many athletes would be well served using both.
No. ActivityStat has no workout builder or training calendar — it enriches the activities you already record. If plan-building is what you need, Intervals.icu or a dedicated coaching platform is the better fit.
Connect your free Strava account and ActivityStat writes your pace, power, cadence and trends straight into each activity description. Free to start.