Intervals.icu — Analytics & Data

What is Intervals.icu?

Intervals.icu is a free training platform built by athletes for athletes. It helps cyclists, runners, triathletes, and other endurance athletes track fitness, fatigue, and form across multiple sports with powerful analytics and structured training plans. It solves the problem of fragmented training data by connecting with Strava, Garmin, and 250+ other devices and platforms.

Who is it for?

Ideal for serious amateur and pro athletes who want deep performance metrics like power curves, cardiac drift analysis (decoupling), and automatic FTP estimation. It is not for casual gym-goers or those who only need basic step tracking. Use cases include building structured workouts, monitoring long-term fitness with the Performance Management Chart, and collaborating with coaches via built-in chat.

Key Capabilities

Intervals.icu offers automatic interval detection, power analysis with multiple modeling algorithms (eFTP, Morton's 3P, Monod & Scherrer), custom training zones per sport, a drag-and-drop training calendar, and a text-based workout builder that exports to Zwift and other platforms.

• Performance Management Chart — Visualize fitness, fatigue, and form over time with historical data from Strava and Garmin.
• Multi-Sport Analytics — Separate zones and metrics for cycling, running, swimming, rowing, and more.
• Automatic Interval Detection — Find efforts, detect spikes, and correct power/HR data in every activity.
• Power Curve & Modeling — Compare power curves across seasons, view watts/kg, and estimate MAP with eFTP, 3P, and Monod-Scherrer algorithms.
• Custom Training Zones — Create zones for any stream, anchor to FTP or LTHR, and use in workouts and analysis.
• Training Calendar & Workout Builder — Drag-and-drop planning, text-based workout creation, sync to devices, import/export ZWO, FIT, MRC, ERG.
• Coach-Athlete Communication — Share workouts, chat, and collaborate directly within the platform.

Intervals.icu pricing: Free, with Premium from $9.99/mo. Billing model: Freemium.

For comparison: the median starting price in Analytics & Data is $39/month, measured across 274 tools we track. See the full SaaS Pricing Index →

Free Plan

Full access to core features including activity analysis, fitness tracking, and basic planning for unlimited activities. No credit card required.

Premium Plan — $9.99/month

Unlocks advanced analytics like year-over-year comparisons, custom charts, coach athlete management, priority support, and more. Discounted annual billing available.

Start with the free plan; no trial needed.

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