Health & fitness analytics · intervals.icu

intervals.icu

Free, device-agnostic training-analytics platform for endurance athletes, with a low-cost paid tier for advanced features.

Visit intervals.icu Alternatives

intervals.icu is a training-analytics and planning platform for cyclists, runners, and triathletes, built by an independent developer and offered largely for free. It imports activity history from Strava, Garmin, or direct file upload to compute power curves, fitness/fatigue load models, training zones, and multisport calendars, with a workout builder for structured sessions. The free tier covers the great majority of analytics functionality with no credit card required; a low-cost Supporter tier adds extras such as advanced weather analysis, annual training-plan building, full Strava history import, route matching, and team or coaching organization tools. It is cloud-hosted only, and its main appeal versus Garmin Connect or TrainingPeaks is depth of free analytics and an active power-user community rather than device bundling or coaching marketplaces.

At a glance

Vendor intervals.icu
Pricing model Free tier + paid plans
Free tier Yes
Deployment Cloud
Open source No
Best for Data-driven endurance athletes who want deep, free training-load analytics without buying dedicated hardware or a coaching platform.

Pricing

Free tier with no credit card required covers most features; a $4/month Supporter tier adds advanced extras.

Plan Price Notes
Free $0 no credit card required; fitness tracking, power curve, calendar, workout builder, device integrations
Supporter $4/month adds advanced weather analysis, annual plan builder, full Strava history import, route matching, team/coaching tools

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Features

  • Power curve and fitness/fatigue (training load) analysis
  • Multisport training calendar and workout builder
  • Import from Strava, Garmin, and direct file upload
  • Custom training zones and power/HR/pace analysis
  • Team and coaching organization tools
  • Route matching and weather analysis
  • CSV data upload and export

Integrations

Profile last reviewed September 21, 2026

Alternatives

TrainingPeaks Structured training-plan and performance-analytics platform for endurance athletes and coaches, with optional paid coaching tiers. Strava Free social fitness app that reads activity data from any GPS watch or phone, with a paid subscription for deeper training analysis. Garmin Connect Free companion app and analytics platform for Garmin watches and devices, covering training load, sleep, and health metrics. WHOOP Screenless wrist-worn fitness tracker sold as a membership, with strain, recovery, and sleep analytics rather than a one-time device purchase.

intervals.icu in the index now

Terms to know

Training load A quantified measure of how much physical stress a workout or training period placed on the body.

Related guides

How to choose a health and fitness tracker Device-bundled, subscription-only and device-agnostic trackers answer "how am I doing" differently — hardware and billing model decide more than the app.