By JuanPa, creator of TrainingForever · Data verified on 29/10/2026 on official websites
Transparency: This article is written by TrainingForever, who competes with intervals.icu. That is why we link each data to the official website of each platform, with the date on which we consult it, and we also count on what is best intervals.icu.intervals.icu is branded by its owner.
Short answer: intervals.icu is a platform of free and very deep analysis, designed above all for the athlete of cycling, running and triathlon who wants to understand his data. For the day-to-day work of a coach with clients, TrainingForever today goes further: running, trail, cycling, swimming, triathlon and strength in the same plan, has an AI assistant who creates sessions and writes messages, session messaging, forms, tasks, schedule with reservations, clubs of various coaches and online payments with Stripe, and sends the workouts to your watch (Garmin, Polar, Suunto, Apple Watch, Choirs...). It is free up to 5 athletes and never goes beyond €49 a month, and the athlete does not pay. If you only need analysis and don't mind mounting the rest with other tools, intervals.icu is cheaper: free or $4 a month.
If you are looking for a wider view of the market, read our guide to the best software for coaches or the comparative TrainingForever vs TrainingPeaks. Here we go face to face with intervals.icu: what each platform offers, how much it costs with your number of athletes and in which cases we recommend you stay where you are.
How do TrainingForever and Intervals.icu differ?
intervals.icu was born in 2018 as an extension of analysis for Strava and today is a free training platform, funded by its Supporter subscribers and with a small team and a very active community (source). Its strong point is analysis: fitness, fatigue and shape, power curve, models, decoupling and custom graphics. TrainingForever has been built around the day to day coach: plan all disciplines in one plan, communicate with each athlete, automate repetitive work and manage payments, with an AI assistant that has the context of each athlete.
| Aspect | intervals.icu | TrainingForever |
|---|---|---|
| Price model | Free, no card and no time limit. Optional supporter: 4 USD/month (source) | Free up to 5 active athletes. From the 6th, €0.99 per active athlete per month, maximum 49 €/month (source) |
| What the payment plan adds | Supporter: annual plan, Strava's complete history, teams and coach organizations, block sports configuration, fully customized areas, time analysis and more (source) | All functions from the free plan. Optional gems: Assistant IA 4,99 €, Video 2,99 €, Business 3,99 €, Automation 2,99 €, Advanced Analysis 3,99 €, Storage from 1,99 € or pack 12,99 €/month (source) |
| Does the athlete pay? | No: the platform is free for everyone; each user can become Supporter if you want (source) | No, never (source) |
| Currency | USD | EUR |
| Approach | Analysis and training platform for cyclists, runners, triathletes and other athletes, “made by athletes, for athletes” (source) | Platform for coaches and clubs of endurance and strength: tiles, planning, loading, feedback, messages, files and collections (source) |
| Language | 21 languages, including Spanish (source) | Made in Spain. Web in Spanish, English, French, Dutch, German, Italian and Portuguese (source) |
| Disciplines | Cycling, running, swimming, rowing and triathlon, with areas and adjustments separated by sport (source) | Running, trail, cycling, swimming, triathlon and strength in the same plan, with own editor for each sport (source) |
| Session Editor | Text editor with power steps (%FTP, watts, %MAP), HR, pace or cadence; imports and exports ZWO, FIT, MRC and ERG (source) | You write the session as you would tell the athlete and it turns into steps. Targets per HR, %LTHR, threshold rate, VAM, %FTP, %MMP, watts, RPE or speech test (source) |
| Strength | — | Blocks, superseries, circuits, %1RM, RPE/RIR, tempo and rest, with library of video exercises and own exercises (source) |
| Sports management | Follow (reading) or train (writing) other athletes if they accept; tags, overview, activity feed, compliance and plan summary (source) | Complete sheets, list "Required attention" (unmade meetings, inconveniences, late payments), planned adherence to made, RPE and feedback (source) |
| AI | We do not find AI own; your website cites third-party apps with AI connected to your API (source) | AI Assistant with the context of each athlete: creates sessions, summarizes the load, prioritizes and writes messages; you decide (Gema, €4.99/month). API with MCP for ChatGPT or Claude (source, FAQ) |
| Communication | Group chat, photos and captures, sharing training (source) | Messaging linked to each session, groups, attachments and mass alerts; voice screen recorder; automated alert forms; task manager (source) |
| Agenda | Dragable training calendar; imports third-party calendars; weather forecast (source, source) | Calendar synchronized with Google Calendar in both directions and athlete bookings from mobile (source) |
| Clubs and equipment | Organization of teams and clubs in chat; teams and organizations of coaches with Supporter (source, source) | Clubs of up to 6 coaches, groups, invitation codes, board, challenges and joint billing (source) |
| You get paid by your athletes. | — | Collection online with Stripe (card or address), monthly rates, per block or per session, automatic invoices, reminders of non-payment and MRR (Gema Business, 3,99 €/month) (source) |
| Automations | — | Rules ‘when this happens, do this’ (Gema, €2.99/month) (source) |
| Delivery of training to the watch | Send planned training to various devices (e.g. HUAWEI watches) (source, source) | Send the workouts to your watch: Garmin, Polar, Suunto, Apple Watch, Choirs and others (source) |
| Watches and apps online | Garmin, Strava, Polar, Suunto, Choirs, Wahoo, Zwift and many more; more than 1,200 third-party apps via API (source, source) | Garmin, COROS, Polar and more; Strava (with history import), Google Calendar and API with MCP (source, source) |
| Mobile App | — | iOS and Android, with offline sessions and logs (source) |
| Seasonal plan | Annual plan that calculates base, construction and peak backwards from the target race (Supporter); plans applicable to several athletes (source, source) | Weekly plan and blocks of N weeks (base, construction, peak, discharge) reusable between athletes (source) |
| Analysis | Very deep: fitness, fatigue and shape, power curve, eFTP, power models, decoupling, interval detection and custom graphics (source, source) | Chronic load, acute load and shape; map, zones, intervals and profile of each activity; tests and brands; RPE and athlete comments (source) |
| API and Extensions | REST API open with OAuth and webhooks; own JavaScript for fields and graphics (source, source) | API with MCP for ChatGPT or Claude (source) |
| Customer recruitment | Public directory of coaches and "Ask A Coach" (source, source) | No directory of coaches |
| Migration | — | No direct import from intervals.icu: we help you migrate. Imports history from Strava |
"—" means that we do not find it on the official pages of intervals.icu consulted, not that it does not exist. If we're missing anything, write to us and we'll fix it.
How much does it cost each?
Here intervals.icu wins without discussion: the platform is free for everyone, without card and without time limit, and Supporter subscription costs 4 USD per month. This subscription includes, among other things, the teams and organizations of coaches, the configuration of players in block and the annual plan (source). In TrainingForever is free up to 5 active athletes; from the sixth you pay €0.99 for each active athlete that month, with a cap of €49, and the athlete never pays. The table compares the coach's share in the currency in which they publish it.
| Sportsmen | intervals.icu (USD) | TrainingForever (EUR) |
|---|---|---|
| 1 athlete | 0 USD (4 USD/month if you become Supporter) | 0 € |
| 5 athletes | 0 USD (4 USD/month if you become Supporter) | 0 € |
| 20 athletes | 0 USD (4 USD/month if you become Supporter) | 19,80 € |
| 50 athletes | 0 USD (4 USD/month if you become Supporter) | 49 € (top) |
Sources: prices of intervals.icu y prices of TrainingForever. What changes is not so much the price as what it includes: with intervals.icu, strength, payments, forms or schedule you will have to solve them with other tools. In TrainingForever, Gems are optional extras, monthly and non-permanence: Assistant AI 4,99 €, Video 2,99 €, Business 3,99 €, Automatizations 2,99 €, Advanced Analysis 3,99 €, Storage from 1,99 € or the complete pack for 12,99 € per month.
Where does TrainingForever go further?
TrainingForever is a Spanish platform for coaches and clubs of endurance and strength that brings together planning, communication, analysis and business in one place.
- Force in the same plan: blocks, superseries, circuits, %1RM, RPE/RIR, tempo and rest, with library of exercises in video and own exercises, along with running, trail, cycling, swimming and triathlon (source).
- AI Assistant with context: knows the tab, the load and the calendar of each athlete; creates sessions from a text, summarizes the load of the team, prioritizes who to attend and writes messages. He proposes and you decide. And with the API with MCP you can work from ChatGPT or Claude.
- Time-saving communication: messaging linked to each session, mass alerts, voice screen recorder, automated alert forms and a task manager that fills itself.
- Who needs attention today: a list of unmade sessions, inconveniences and late payments, and the adherence of each athlete, planned against the realized (source).
- Integrated business: online payment with Stripe (card or home), automatic invoices, reminders of default and MRR.
- Clubs and agendas: clubs of up to 6 coaches with joint billing, and schedule synchronized with Google Calendar in both directions, with athlete reservations from the mobile.
- Train us on the watch: send the workouts to your watch: Garmin, Polar, Suunto, Apple Watch, Choirs and others. If you change a target pace from your mobile, your watch gets it before you start.
- App for iOS and Android: the same platform on the mobile, with sessions and offline records.
Where's the strongest intervals.icu?
It should be said clearly, because it may weigh in your decision:
- Price: free for everyone, and 4 USD a month with Supporter (source).
- Depth of analysis: fitness, fatigue and shape, automatic estimation of eFTP, power curve with various models, decoupling, interval detection and custom graphics with dozens of metrics (source).
- Open ecosystem: REST API with OAuth and webhooks, own JavaScript to create fields and graphics, and more than 1,200 connected third-party apps (source, source).
- Integrations: syncs with Garmin, Strava, Polar, Suunto, Choirs, Wahoo, Zwift and many more platforms, and exports training to roller formats such as ZWO, MRC and ERG (source, source).
- Annual plan: generates the base, construction and peak backward phases from the target race (with Supporter) (source).
- Languages and community: 21 languages, a very active forum and a public directory of coaches (source, source).
When to choose each one?
| Choose intervals.icu if... | Choose TrainingForever if... |
|---|---|
| You want to analyze your own workouts thoroughly without paying | You're a coach and you want to manage your athletes and your business in one place. |
| Train mostly cycling with power and you are interested in custom models and graphics | Programs force next to running, trail, cycling, swimming or triathlon in the same plan |
| You like to extend the platform with your API or your own JavaScript | You want an AI assistant to prepare sessions and messages with the context of each athlete |
| Your athletes use apps or devices that only connect intervals.icu | You want to manage payments from your customers online, send forms and keep the calendar from the same platform |
| Your software budget is zero. | You have a club with several coaches and you want to start with up to 5 athletes for free |
They don't have to be excluded: since both connect to Strava and the most common watches, an athlete can continue to look at her data on intervals.icu while you plan, talk to and manage her payments from TrainingForever.
How to move from intervals.icu to TrainingForever?
TrainingForever does not announce a direct import from intervals.icu. What we do is help you migrate:
- Create your account Free: up to 5 athletes, no card.
- Write to us. and we organize with you the passage of your plans and athletes.
- Imports history from Strava and review areas and templates before programming.
- Invite your athletes and ask them to connect their watch to receive the training.
- Use the two platforms in parallel a few weeks and decide with real data.
Frequently Asked Questions
Is TrainingForever an alternative to intervals.icu?
Depends on what you use intervals.icu for. If you use it to analyze your own workouts, intervals.icu is free and very complete. If you are a coach and work with clients, TrainingForever goes further: running, trail, cycling, swimming, triathlon and strength in the same plan, and adds AI assistant, messaging linked to each session, forms, tasks, schedule with reservations, clubs of various coaches and online payments with Stripe.
How much does intervals.icu cost?
According to its official website (accessed on 29/10/2026), intervals.icu is free, without card and without time limit. The Supporter subscription costs USD 4 per month and adds, among other things, the annual plan generator, importing the full history of Strava, teams and coach organizations, and the setup of block athletes. It can be cancelled at any time.
How much does TrainingForever cost?
It is free up to 5 active athletes, with all features and without card. From the sixth, it costs €0.99 per month for each active athlete that month (they all count), with a maximum of €49 per month. The athlete never pays. There are optional monthly and non-permanence extras, the Gems: Assistant AI (4,99 €), Video (2,99 €), Business (3,99 €), Automatizations (2,99 €), Advanced Analysis (3,99 €), Storage (from 1,99 €) or the complete pack (12,99 €).
Can you train athletes with intervals.icu?
Yeah. At intervals.icu any user can follow (read only) or train (with writing permission) other athletes, provided they accept the request. It has tags to organize them, an overview of everyone's status, plan compliance summary and group chat. The functions of teams and coach organizations go in the Supporter subscription.
Does intervals.icu have strength training or customer payments?
On the official pages that we consulted on 29/10/2026, intervals.icu focuses on cycling, running, swimming, rowing and triathlon, and we do not find a force editor or customer payments. TrainingForever includes strength with blocks, superseries, %1RM, RPE/RIR and tempo, and online payments with Stripe with the Gem Business (3.99 €/month).
Does TrainingForever have artificial intelligence?
Yeah. The AI Wizard knows the tab, load, calendar and library of each athlete: it creates sessions from a text, summarizes the load of the team, prioritizes who to attend and writes messages. He proposes and you decide. It is activated as Gem for €4.99 per month. In addition, the MCP API allows you to use TrainingForever from ChatGPT or Claude. At intervals.icu, the AI tools your website mentions are third-party apps connected to your open API.
Intervals.icu is in Spanish?
Yeah. Its website indicates that it is available in 21 languages, including Spanish. TrainingForever is a platform made in Spain, and its website is in Spanish, English, French, Dutch, German, Italian and Portuguese.
What clocks connect each platform?
TrainingForever sends the workouts to your watch: Garmin, Polar, Suunto, Apple Watch, Choirs and others, and the watch data goes back to your analysis. Connect with Garmin, COROS, Polar and more, in addition to Strava, Google Calendar and an API with MCP. intervals.icu syncs with Garmin, Strava, Polar, Suunto, Coros, Wahoo, Zwift and many more platforms, you can send planned trainings to multiple devices and have over 1,200 third-party apps connected to your API.
Can I switch from intervals.icu to TrainingForever?
Yeah. TrainingForever does not announce a direct import from intervals.icu: we help you migrate. What you can care about is the history of activities since Strava. Many athletes can continue to use intervals.icu for their personal analysis, because the two platforms connect to the same watches and Strava.
Sources and methodology
All data were consulted on 29/10/2026 on the official pages of each platform. Prices change: check them before you decide. If you see any outdated data, write us down and we correct it.
- intervals.icu. Home. intervals.icu
- intervals.icu. Pricing. intervals.icu/pricing
- intervals.icu. Keep Track of Athletes. intervals.icu/features/athletes
- intervals.icu. Share Workouts & Chat. intervals.icu/features/chat
- intervals.icu. Plan Your Training. intervals.icu/features/plan
- intervals.icu. Workout Builder. intervals.icu/features/workout-builder
- intervals.icu. Training Calendar. intervals.icu/features/training-calendar
- intervals.icu. Multisport Support. intervals.icu/features/multisport
- intervals.icu. Track Your Progress. intervals.icu/features/track
- intervals.icu. Open API. intervals.icu/features/open-api
- intervals.icu. Custom JavaScript. intervals.icu/features/custom-javascript
- intervals.icu. Integrations. intervals.icu/integrations
- intervals.icu. Coaches. intervals.icu/coaches and Ask A Coach. intervals.icu/features/ask-a-coach
- intervals.icu. About. intervals.icu/about
- TrainingForever. Home, prices and frequently asked questions. new.trainingforever.com
- TrainingForever. Features. new.trainingforever.com/functionalities
intervals.icu, Garmin, Strava, COROS, Polar, Suunto, Apple Watch, Wahoo, Zwift, HUAWEI, Stripe, Google Calendar, ChatGPT, Claude and the other brands listed belong to their respective owners. TrainingForever is not affiliated to any of them.
