Pro
$8.49/mo
Daily chat, weekly planning and workout analyses, strength coach and physiologist personas, deep analysis every three months.
fartlek.io · checked 2026-10-13
Coach FartlekAI coaching app for running
Conversational running coach (5K to marathon) that plans to a race, reads HRV and messages you first.
–overall of 5
Not ranked yet (4 of 8 scored dimensions needed) · 0 of 8 dimensions scored · entry reviewed
- Sports Running
- AI level Conversational AI coach
- Plan Adaptive plan + chat
- Human coach unverified
- Price USD 8.49/month
- Pushes workouts to 1 device or app
Coach Fartlek is an AI running coach for 5K to marathon, available on iOS and Android and built on intervals.icu data. It lays out training blocks (base, build, peak, taper) up to the target race, puts the coming weeks as sessions with pace and heart-rate targets in the calendar, sends them to the watch through intervals.icu, and rebuilds the week after missed sessions or on request in chat. It reads resting heart rate, HRV and sleep, weighs logged illness and niggles, reviews every run, and messages the athlete before and after sessions. Specialist personas cover strength (Pro) and nutrition (Elite). The vendor states ultra and multisport are not covered. Pricing is a Pro or Elite monthly subscription after a 7-day trial.
AI level: Conversational AI coach. An LLM-based coach the athlete talks to in free text; it can explain, negotiate and change the plan, usually on top of a model-driven or rule-based planner. fartlek.io
What the coach does
Thirteen capabilities, as stated on the vendor's own pages: 8 yes, 3 partly, 1 no, 1 unverified. Unverified means the vendor's pages checked do not say; it does not mean absent.
| Capability | Vendor says | Source |
|---|---|---|
| Plan | ||
| Builds a periodized planYes means: Plan generated from goal, date, availability and current fitness, with phases.fartlek.io | Yes | fartlek.io |
| Precise workout prescriptionYes means: Interval-level targets (pace, power or HR) executable on a device.fartlek.io | Yes | fartlek.io |
| Race preparationYes means: Race blocks, taper and a pacing or race-day plan for the target event.fartlek.io | Partly | fartlek.io |
| Adapt | ||
| Adapts to lifeYes means: Missed or moved sessions and availability changes re-flow the plan automatically.fartlek.io | Yes | fartlek.io |
| Adapts to fatigueYes means: Load changes from HRV, sleep, resting HR or subjective feel without the athlete asking.fartlek.io | Yes | fartlek.io |
| Handles injury and illnessYes means: Pause and return-to-training progression, not just skip.fartlek.io | Partly | fartlek.io |
| Relationship | ||
| Post-workout feedbackYes means: Per-session analysis referencing the athlete's data and the plan's intent.fartlek.io | Yes | fartlek.io |
| ConversationYes means: Free-text chat that can answer questions and change the plan.fartlek.io | Yes | fartlek.io |
| Check-ins and accountabilityYes means: Scheduled check-ins, debriefs or reminders initiated by the app.fartlek.io | Yes | fartlek.io |
| Human coach in the loopYes means: A human coach reviews or messages, included or as an add-on. | unverified | |
| Beyond endurance | ||
| Strength and mobilityYes means: Prescribed strength or mobility sessions scheduled alongside endurance work.fartlek.io | Yes | fartlek.io |
| Nutrition and fuelingYes means: Session- or day-specific fueling numbers.fartlek.io | Partly | fartlek.io |
| Multisport planningYes means: Balances load across sports in a single plan.fartlek.io | No | fartlek.io |
Works with
5 partners named on the vendor's pages; structured workouts go to 1. ✓ means the vendor states it, – means not stated. A partner not listed is unverified, not unsupported.
| Partner | Reads activities | Pushes workouts | Wellness data | Source |
|---|---|---|---|---|
| Watches | ||||
| Garmin (watches / Connect)Via intervals.icu.fartlek.io | ✓ | – | – | fartlek.io2026-10-13 |
| PolarVia intervals.icu.fartlek.io | ✓ | – | – | fartlek.io2026-10-13 |
| COROSVia intervals.icu.fartlek.io | ✓ | – | – | fartlek.io2026-10-13 |
| SuuntoVia intervals.icu.fartlek.io | ✓ | – | – | fartlek.io2026-10-13 |
| Training platforms | ||||
| intervals.icuRequired; reads workouts, resting HR and HRV; planned sessions are written to the intervals.icu calendar.fartlek.io | ✓ | ✓ | – | fartlek.io2026-10-13 |
Pricing
- Model
- Subscription fartlek.io
- Monthly
- USD 8.49 fartlek.io
- Annual
- unverified
- Free tier
- Free trial fartlek.io
- Trial
- 7 days fartlek.io
Plans as the vendor lists them, verbatim prices. Prices change; each plan links to its source.
Elite
$20.99/mo
Everything in Pro plus nutritionist persona, monthly deep analysis and self-coached mode.
fartlek.io · checked 2026-10-13
Scores and evidence
Each dimension is scored 1 to 5 against the published rubric and cites one public page. Overall – is the mean of the 0 scored dimensions.
| Dimension | Score | Bar | Median |
|---|---|---|---|
| Plan quality | – | 3 | |
| Adaptation | – | 4 | |
| Workout feedback | – | 3 | |
| Coaching relationship | – | 2 | |
| Multisport planning | – | NaN | |
| Transparency | – | 3 | |
| Value for money | – | 3 | |
| Athlete sentiment | – | 3 |
Plan quality
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Adaptation
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Workout feedback
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Coaching relationship
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Multisport planning
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Transparency
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Value for money
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
Athlete sentiment
No public evidence yet, so this dimension is not scored and does not count toward the overall. What would count as evidence
What athletes say
Independent reviews, forum threads and store listings consulted for the scores. Titles as published; read them at the source.
Questions about this app
Answered from the cited facts above only. A question is left out when its fact is unverified.
What kind of AI coach is Coach Fartlek?
Coach Fartlek is classified as "Conversational AI coach": An LLM-based coach the athlete talks to in free text; it can explain, negotiate and change the plan, usually on top of a model-driven or rule-based planner.
Does Coach Fartlek push workouts to my watch or bike computer?
Yes. The vendor states structured workouts are sent to intervals.icu.
Does Coach Fartlek adapt the plan to fatigue and sleep?
Yes. Load changes from HRV, sleep, resting HR or subjective feel without the athlete asking.
What does Coach Fartlek cost?
USD 8.49/month, 7-day trial.
Which sports does Coach Fartlek coach?
Running.
Similar apps
Apps for the same sport, ordered by how many coaching capabilities they share with Coach Fartlek.
Vendor sources consulted
Spotted an outdated fact? Send the vendor page that states the current one.