Intervals.icu

What Intervals.icu does

Intervals.icu is a free, web-based training analytics platform serving individual endurance athletes (cyclists, runners, triathletes, swimmers, rowers) and the coaches who manage them. The platform aggregates data from 250+ third-party integrations including Strava, Garmin, Wahoo, Zwift, Coros, Polar, Oura, WHOOP, Suunto, and Amazfit, and processes it through proprietary algorithms such as automatic eFTP estimation, multiple power-curve modeling approaches (Morton's 3P, Monod & Scherrer), cardiac decoupling analysis, and automatic interval detection with spike correction. The product surface spans fitness/fatigue/form tracking (CTL/ATL/TSB Performance Management Chart), activity timeline analysis, multisport support with sport-specific zones, a workout builder supporting Zwift (ZWO), FIT, MRC, and ERG formats, a training calendar, and a custom JavaScript extension layer for user-defined metrics and charts.

The underlying technology runs on Google Cloud with Backblaze and Wasabi for storage, hosted with data residency in Germany and Finland to support GDPR compliance. A full REST API with OAuth 2.0, webhooks, and MCP availability enables the integration ecosystem that functions as a distribution channel. The platform is offered free to all users with an optional $4/month Supporter subscription unlocking advanced features including the annual training plan builder, weather analysis, full Strava history import, route matching, teams and coaching organization tools, and early beta access. Customer acquisition is entirely organic, driven by word-of-mouth in cycling and triathlon forums, social media presence, and integrations with major fitness platforms; the company runs no paid advertising.

Intervals.icu Ltd. is a UK private limited company headquartered at 71-75 Shelton Street, Covent Garden, London, with the founder and lead developer based in Cape Town. The company was founded in mid-2018 by David Tinker as a side project and grew organically to 160,000+ active athletes analyzing 193M+ activities by 2025, supported by a seven-person core team and volunteer community moderators. As of September 2024 the founder works full-time on the platform; no external institutional investment, parent company, or public listing is disclosed.

Name

Intervals.icu

Legal name

Intervals.icu Ltd.

Website

https://intervals.icu

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

Intervals.icu is a free web-based training analytics platform for cyclists, runners, triathletes, and other endurance athletes, offering fitness tracking, activity analysis, workout planning, and integrations with 250+ third-party devices and apps, monetized via an optional $4/month Supporter subscription.

Ownership category

akta.pro rank

Product category

Endurance Training Analytics

NAICS

Sports and Recreation Instruction (611620)

SIC

Services-Computer Integrated Systems Design (7373), Measuring & Controlling Devices, Nec (3829)

akta.pro primary industry

Endurance & Running/Cycling Training (HSADAAAG)

akta.pro secondary industry

Virtual & Hybrid Participation Events (App-Based, Remote/Hybrid Races) (MPAKAIAH)

Keywords

• Training analytics platform
• Athlete performance tracking
• Cycling training software
• Endurance fitness analysis
• Multisport training tools

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2C

Offering type

Software

Cost components

Infrastructure, Personnel, Technology or R&D, Operations

Revenue model

1. Free Tier: Free access to core training platform features including fitness tracking, activity analysis, interval detection, training calendar, workout builder, power curve analytics, multisport support, device integrations, and custom charts. No credit card required.
2. Supporter Subscription: $4/month Supporter subscription unlocking advanced features including weather analysis, annual training plan builder, full Strava history import, route matching, auto-flag commutes, customizable activity summaries, completely custom zones, CSV activity stream data upload, teams and coaching organization features, bulk athlete configuration, and early access to beta features.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Intervals.icu is a free, web-based training analytics platform for cyclists, runners, triathletes, and other endurance athletes. It provides comprehensive training load tracking (fitness, fatigue, form), automatic interval detection, power curve analysis, multisport support with independent zones per discipline, workout building, and training calendar planning. The platform integrates with 250+ third-party apps via an open REST API and is offered free with an optional $4/month Supporter subscription.

Product overview

Intervals.icu is a free, unified online training platform for cyclists, runners, triathletes, and other athletes. The platform consists of core product modules organized into five main categories: Track Your Progress (Fitness Chart, Power Curve, Multisport, Activity Totals, Wellness Integration, Custom Charts, Power Rankings), Analyze Your Activities (Activity Timeline, Power Charts, Decoupling, Heart Rate Charts, Cumulative HR, Intervals Table), Plan Your Training (Custom Zones, Training Calendar, Workout Builder, Training Plans, Annual Plan Builder, Weather Forecasts), Communicate (Chat, Ask A Coach, Athletes Management), and Extend & Integrate (Open API, App Integrations, Custom JavaScript). The platform is free for all users with an optional $4/month Supporter tier unlocking advanced features including annual training plan builder, weather analysis, and early access to beta features. It integrates with 250+ third-party apps via open API and connects natively to major platforms including Strava, Garmin, Wahoo, Zwift, Coros, Polar, Oura, WHOOP, and others.

Differentiator

Problem solved

Functional benefit

Products and services

• Intervals.icu Training Platform Free web-based training analytics platform for cyclists, runners, triathletes, and other endurance athletes. Tracks fitness, fatigue, and form (CTL/ATL/TSB), provides automatic interval detection, power curve analysis, multisport support with independent zones, workout builder, training calendar, decoupling analysis, and chat for coach-athlete collaboration. Integrates with 250+ third-party apps via an open REST API. Free tier available; optional $4/month Supporter subscription unlocks advanced features.
• Tour de France 2026 Stage Dashboard Interactive dashboard dedicated to the Tour de France 2026, featuring stage-by-stage race profiles, elevation maps, routes, categorized climbs, weather forecasts, and race timings for all 21 stages. Built in collaboration with Science to Sport.com.

Quantifiable outcome

• Users report canceling paid alternatives like TrainingPeaks Premium in favor of Intervals.icu
• +1 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration20 records

AI capability6 records

Feature10 records

Partnerships

14 partnerships are on record, tiered minor and core.

• Science to Sport.comminorStrategic or Co-development Partner · 1 January 2025Science to Sport.com helped with the development of the Tour de France 2026 stage dashboard, providing performance expertise for the interactive race visualization features.
• StravacoreTechnology or IntegrationBi-directional integration enabling activity upload/download, historical data import, and workout sync with Strava.
• GarmincoreTechnology or IntegrationDirect integration for syncing activities, workout sync, and wellness data including weight, sleep, HRV, readiness from Garmin Connect.
• WahoocoreTechnology or IntegrationIntegration for syncing activities and workouts with Wahoo devices and ecosystem.
• ZwiftcoreTechnology or IntegrationIntegration for syncing activities and importing/exporting workouts in ZWO format.
• CoroscoreTechnology or IntegrationIntegration for syncing activities and wellness data with Coros devices.
• PolarcoreTechnology or IntegrationIntegration for syncing activities and wellness data with Polar devices.
• 250+ Third-party Apps and DeveloperscoreTechnology or IntegrationOpen API ecosystem with 250+ third-party integrations including coaching tools, indoor training apps, data sync apps, workout generators, and AI coaches. The community has built custom streams, charts, fields, and integrations.
• Google CloudcoreTechnology or IntegrationCloud infrastructure provider for hosting Intervals.icu services and data processing.
• OuracoreTechnology or IntegrationIntegration for syncing wellness data including sleep, HRV, and readiness from Oura Ring.
• WHOOPcoreTechnology or IntegrationIntegration for syncing wellness data from WHOOP devices.
• SuuntocoreTechnology or IntegrationIntegration for syncing activities and wellness data with Suunto devices.
• AmazfitcoreTechnology or IntegrationIntegration for syncing wellness data with Amazfit devices.
• HuaweicoreTechnology or IntegrationIntegration for syncing wellness data with Huawei devices via Huawei Health.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• TrainingPeaks: TrainingPeaks is the long-established premium training platform for endurance athletes and coaches, offering similar analytics, workout builders, and coaching tools. Intervals.icu users explicitly report canceling TrainingPeaks Premium in favor of Intervals.icu, making it the closest direct competitor.
• Final Surge: Final Surge is a training platform serving coaches and athletes with workout planning, calendar management, and athlete communication. Directly comparable to Intervals.icu's coaching organization features.
• Xert: Xert provides advanced fitness analytics for cyclists with proprietary modeling algorithms (similar to Intervals.icu's eFTP and Morton's 3P). Direct competitor in the power analytics niche serving serious cyclists.
• Runalyze: Runalyze is a free training analytics platform for runners with comprehensive fitness tracking, similar to Intervals.icu's running features. Direct competitor in the running analytics space with overlapping capability set.
• Today's Plan: Today's Plan is a training analytics platform with FTP estimation, training load tracking, and workout planning for endurance athletes. Directly comparable feature set to Intervals.icu, particularly in cycling analytics.
• Selfloops: Selfloops is a training analytics platform for multi-sport athletes with similar fitness tracking, workout planning, and coach-athlete management features. Direct competitor in the endurance athlete analytics space.

Others

• Catapult Sports: Catapult provides sports performance analytics primarily for professional teams and athletes. While serving a different segment (team-based sports performance), it represents the broader sports analytics category that Intervals.icu operates within.

Broad incumbents

• Strava: Strava is the dominant social fitness platform for cyclists and runners with native activity tracking and growing analytics features. While broader in scope (social networking, all sports), Strava is a key data source and competitor in the analytics space.
• Garmin Connect: Garmin Connect is a free activity tracking and analytics platform bundled with Garmin devices. While primarily a device maker's software, it provides analytics that compete with Intervals.icu for casual users.
• Wahoo SYSTM: Wahoo SYSTM is an indoor training platform with structured workouts and analytics, part of the broader Wahoo ecosystem. It overlaps with Intervals.icu's workout builder and indoor training integration capabilities.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/intervalsicu
• GitHubgithub.com/intervals-icu
• Facebookfacebook.com/intervalsicu
• Instagraminstagram.com/intervals.icu
• LinkedInlinkedin.com/company/intervals-icu

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Intervals.icu