What Intervals.icu does well
The most comprehensive free training analytics platform. CTL/ATL/TSB (fitness/fatigue/form). Power curve analysis. Planned workout builder. Wellness tracking. Activity analysis with interval detection. Beloved by data-driven athletes. Free tier is genuinely useful.
The gap Intervals.icu doesn't fill
Your TSB is -25. Are you overreaching? Or just building? Your CTL is climbing at 8 points/week. Is that aggressive or appropriate for you? Intervals gives you the numbers — beautifully — but the interpretation is on you. And it doesn’t know how you feel this morning.
What Intervals.icu can't do
No feel capture. No morning readiness assessment. No daily decision output. No conflict resolution (when TSB says rest but you feel great). No warmup gate. No override tracking. No personal pattern learning beyond what you manually track in wellness fields.
What Rudder adds
| Feature | Intervals.icu | Rudder |
|---|---|---|
| CTL/ATL/TSB tracking | Yes (best in class) | Uses Intervals data as input |
| Power analysis | Yes | No (not our job) |
| Planned workouts | Yes | Reads from Intervals |
| Wellness tracking | Manual fields | Structured daily check-in |
| Daily feel capture | Manual (optional) | Systematic (5 dimensions, before data) |
| "Should I train today?" | No | Yes (GO / MODIFY / BAIL) |
| Form-based conflict detection | No | Yes (overreaching, ramp too fast) |
| Warmup gate | No | Yes |
| Override tracking | No | Yes |
| Pattern learning | No | 10 types (Model of Me) |
| Price | Free / $10/yr premium | $79.99/yr |
Better together
Intervals.icu for analysis. Rudder for decisions. Connect your Intervals.icu account and Rudder pulls your planned workouts, CTL/ATL/TSB, and form zones directly. The numbers feed the decision engine. You get the best analytics platform AND a daily decision you can trust.
Frequently asked
- Can I use Rudder with Intervals.icu?
- Yes. Rudder has a full OAuth integration with Intervals.icu. We read your CTL, ATL, TSB (fitness, fatigue, form), planned workouts, and wellness data.
- What does Rudder add that Intervals.icu doesn't have?
- Intervals.icu shows your numbers beautifully. Rudder adds your subjective feel, resolves conflicts between feel and data, and gives you one actionable training decision each morning.
- Do I need Intervals.icu to use Rudder?
- No. Rudder calculates fitness metrics from Strava data when Intervals.icu isn't connected. But the Intervals integration is the most complete data source we support.
Related
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Your numbers, interpreted. One connection, daily decisions.
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