Tool profile
intervals.icu: cost, fit and limits
intervals.icu is a free online training platform made by Intervals.icu Ltd. for cyclists, runners and triathletes, combining a training calendar, fitness tracking and activity analysis with an optional $4 monthly tier that connects an outside AI assistant.
What to know first
intervals.icu is a web-first training log that syncs from the platforms riders and runners already use. Free costs $0 forever with no credit card, and Supporter costs $4 per month. The only AI feature the home page names is an AI Assistant that links to the Intervals MCP Connector, so the AI comes from whichever assistant you connect rather than from a coach written by the vendor. No annual price is shown.
intervals.icu at a glance
| Maker | Intervals.icu Ltd., Not stated on the vendor pages |
|---|---|
| Free plan | Yes |
| Entry price | $0 (free forever) |
| API access | No |
| Category | Best AI Fitness Tracking Apps in 2026, rank 2 of 12 |
| Website | intervals.icu |
Who intervals.icu is best for
Self-coached triathletes
A calendar-style log with interval summaries and weekly stats fits athletes who write their own plan and want the numbers in one view.
Riders on Zwift and Garmin
The home page lists Garmin, Strava and Zwift integrations, so rides recorded on those services can land in the same calendar.
Athletes who already pay for an AI assistant
The $4 Supporter tier links your own assistant to your training data, so you bring the model instead of paying for a second one.
Cost-sensitive users
Free stays at $0 with no card, which makes it easy to try before deciding whether the connector is worth a few dollars.
intervals.icu plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Free | $0 forever, no credit card | Free online training platform for cyclists, runners and triathletes with fitness tracking, activity analysis and workout planning. |
| Supporter | $4 per month | Adds the Intervals MCP Connector so you can use your own AI assistant on your training; the home page shows a monthly price only. |
| Sign-up terms | No card needed for Free | The home page states that Free requires no credit card; no trial period, annual option or discount is shown on the pages opened. |
Checked November 2026.
What intervals.icu does
- Interval detection
- The privacy page describes automatic interval detection that groups similar intervals together, which saves manual lap work after a structured session. The feature is described on the privacy page, so how it behaves on messy files was not shown.
- Training calendar
- A calendar-style log shows interval summaries and weekly stats, with planned workouts next to completed ones. The same log carries summaries for each interval and weekly totals, so a coach or athlete can review a whole block at a glance.
- Platform links
- The home page names Garmin, Strava and Zwift, with a logo row that also shows Wahoo, Coros, Amazfit, Suunto, Concept2, Rouvy and Dropbox. Which of these sync automatically was not stated.
- MCP Connector
- Supporter users connect their own AI assistant to their training data. The vendor supplies the connector and does not name a model. The Free plan description does not list it, so it belongs to the paid tier.
- Fitness tracking
- Free covers fitness tracking and activity analysis, so the long-term load charts do not depend on the paid tier. Free is described as an online training platform, so no payment is needed for load charts.
How intervals.icu handles your data
The privacy page we opened describes product behavior, such as interval detection and the calendar log, and contained no data terms. Retention, hosting region, certifications and whether training data is used to build models were not found on the pages read. The home page shows a London office address without naming the country, and the maker is listed as Intervals.icu Ltd. Because the AI route uses an outside assistant, that assistant's own terms apply to anything you pass to it.
Where intervals.icu falls short in practice
- Data terms were not located. The pages opened held no retention, hosting or model-training statement, so a buyer needing those facts has to ask the vendor directly. Ask the vendor before storing anything sensitive.
- AI needs your own assistant. The assistant link is a connector, not a coach. You need an account with an outside AI service, which has its own cost and terms.
- Web-first design. The pages we read describe the platform as an online one, with no mention of a standalone mobile app, so check how you will view workouts on the road.
Works with
Alternatives to intervals.icu
intervals.icu: common questions
What does intervals.icu Supporter add for $4 a month?
The home page lists one thing under Supporter: the Intervals MCP Connector, which lets you use your own AI assistant on your training. The Free plan description does not mention it. No annual price appeared, so the cost shown is $4 each month as printed on the home page.
Is intervals.icu really free?
The home page prints Free as $0 forever with no credit card required, and describes it as a free online training platform covering fitness tracking, activity analysis and workout planning. The paid Supporter tier is optional, so the free plan is not a short trial that expires.
Does intervals.icu have its own AI coach?
No coach is named on the pages we read. The AI Assistant link points to the Intervals MCP Connector, so the analysis comes from the assistant you connect, such as one from another company. That keeps the vendor out of model choices, and your assistant's terms govern the exchange.
Which devices and services sync with intervals.icu?
The home page names Garmin, Strava and Zwift, and its logo row also shows Wahoo, Coros, Amazfit, Suunto, Concept2, iGPSPORT, Rouvy and Dropbox. Whether each link is automatic or manual was not described on the pages we opened, so check the integration list when you sign up.
Where does intervals.icu store my training data?
The pages we read do not say. The privacy page described product features and held no hosting region, retention period or certification. The home page shows a London address. If residency matters, ask the vendor in writing or choose a tracker that states a hosting country.