If you've found PlanWatts through the Intervals.icu community, you might assume it's a plugin or add-on for Intervals — something that only makes sense if you're already an Intervals user. It isn't. PlanWatts is a standalone AI training coach that happens to sync well with Intervals.icu, along with Garmin, Strava, and Wahoo directly.
This guide explains what each tool actually does, so you can tell them apart — and figure out whether you need one or both.
In one sentence
Intervals.icu is a training log and analytics platform that records what you did. PlanWatts is an AI coach that decides what you should do next.
They answer different questions. Intervals.icu answers "what happened in my training?" — power curves, CTL/ATL/TSB, activity history, custom charts. PlanWatts answers "what should I do tomorrow?" — it reads your fitness data and builds the actual workout, in your zones, scheduled into your week, through a conversation instead of a form.
What Intervals.icu does
Intervals.icu is a training log and data platform built by athletes, for athletes. Its core strengths:
- Activity sync from almost any device — Garmin, Wahoo, Suunto, Coros, Polar, and more, well beyond what most single-vendor apps support.
- Deep analytics — power curves, CTL/ATL/TSB (fitness/fatigue/form), custom charts and comparisons.
- A manual workout builder — you design the structure yourself, step by step.
- A free tier that's genuinely usable long-term, with an active community and forum.
What it doesn't do: decide your training for you. You (or a coach, or a spreadsheet, or another tool) still have to figure out what workout makes sense given your fitness, your race, and how tired you are this week.
What PlanWatts does
PlanWatts is the layer that makes that decision. Its core strengths:
- A conversational AI coach — tell it your goal, ask questions, request a workout. No form-filling.
- Adaptive, periodized training plans — Base → Build → Peak → Taper, generated from your actual fitness data and updated as you go.
- Automatic post-workout analysis — a 1-10 score, pacing review, and specific feedback comparing planned vs. executed.
- Direct integrations with Garmin, Strava, Wahoo, and Intervals.icu — no single platform is required.
What it doesn't do: replace a deep, long-term training log with years of custom charts. If that's what you value most about Intervals.icu, keep using it — PlanWatts doesn't compete with that part.
Side-by-side
Intervals.icu | PlanWatts | |
|---|---|---|
Core job | Training log & analytics | AI coaching decisions |
Decides your next workout | No (manual) | Yes (AI-generated) |
Interface | Charts, forms, manual builder | Conversational chat |
CTL/ATL/TSB analytics | Yes, deep | Reads it, doesn't replace it |
Post-workout scoring & feedback | Manual review | Automatic |
Device sync | Garmin, Wahoo, Suunto, Coros, Polar, more | Garmin, Strava, Wahoo, Intervals.icu (direct) |
Price | Free tier, paid tiers for advanced analytics | Free tier, paid tiers for more AI credits |
Do you need both?
Not necessarily. PlanWatts works fully standalone, synced directly to Garmin, Strava, or Wahoo — you don't need an Intervals.icu account to use it.
Where it gets good is if you're already an Intervals.icu user who wants an AI layer on top: keep your training log and analytics exactly as they are, and let PlanWatts handle the "what do I train today" decision. Neither tool tries to replace the other's core job.
Is PlanWatts part of Intervals.icu?
No. PlanWatts is an independent product built by a different team. It can sync with Intervals.icu (and separately with Garmin, Strava, and Wahoo), but it isn't a plugin, feature, or official extension of Intervals.icu.
Can I use PlanWatts without Intervals.icu?
Yes. Connect Garmin, Strava, or Wahoo directly and PlanWatts works fully standalone — Intervals.icu isn't required.
Does Intervals.icu have AI coaching?
Intervals.icu is primarily a training log and analytics platform with a manual workout builder — it doesn't generate an adaptive training plan for you through conversation the way PlanWatts does.
Does PlanWatts replace Intervals.icu's training log?
No. If you rely on Intervals.icu's long-term charts, PMC, and custom analytics, PlanWatts doesn't replace that — it adds an AI coaching layer that can sit alongside it.
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