Comparison

Fartlek Interval Trainer vs Welltra

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fartlek Interval Trainer

This running app automatically detects spontaneous intervals during Fartlek runs, providing live color-coded feedback on your effort. It also functions as a powerful timer for structured workouts like HIIT and Tabata, offering detailed metrics and syncing with Strava and Apple Health.

Highlights
  • Auto-detection of Fartlek intervals
  • Live color-coded effort feedback
  • Structured workout timer (HIIT, Tabata)
  • Detailed interval metrics
  • Strava and Apple Health integration
  • Advanced effort level detection
Features
Read full description

Build the interval workout you want. Stay on target while you train. Then learn from every session. FiT is an interval timer and training companion for runners on Apple Watch and iPhone. Create classic intervals, HIIT and Tabata workouts—or run freely with automatic Fartlek interval detection. CREATE WORKOUTS YOUR WAY Build simple work-and-rest sessions or advanced workouts with warm-ups, cooldowns, repeated sets and multiple effort levels. FiT makes even complex sessions clear and easy to follow. STAY ON TARGET Color-coded feedback shows whether you’re on pace. Spoken coaching, audio and haptic alerts help you respond without constantly checking your device—and spoken cues automatically match your chosen language. The Dual Progress Ring shows both your current interval and your overall workout progress at a glance. FARTLEK WITHOUT THE BUTTONS Switch to Fartlek mode and run by feel. FiT detects changes in your speed and automatically converts them into recorded intervals. No reaching for your device. No tapping between efforts. Just run. LEARN FROM EVERY WORKOUT See how each interval performed with detailed pace, heart rate, cadence and distance metrics. Compare workouts to understand how your performance changes over time. Personalized coaching insights use your workout data to highlight meaningful patterns and offer practical recommendations for future sessions. ADVANCED EFFORT TRACKING Advanced workouts can distinguish between sprint, hard, moderate and easy efforts, helping you create more varied sessions and analyze every effort afterwards. APPLE WATCH, IPHONE AND YOUR FITNESS APPS Train in your chosen language on Apple Watch or iPhone. Create and edit interval workouts directly on your watch, with controls for inserting, reordering and deleting interval groups. Save completed workouts to Apple Health and sync your sessions with Strava. KEY FEATURES • Flexible interval timer for running, HIIT and Tabata • Automatic Fartlek interval detection • Dual-ring live workout progress • Color-coded pace and effort feedback • Localized spoken coaching, plus audio and haptic alerts • Create and edit interval workouts on Apple Watch • Detailed pace, heart rate, cadence and distance metrics • Performance tracking for every interval • Workout comparisons and personalized insights • Sprint, hard, moderate and easy effort levels • Apple Health and Strava integration • Light and dark appearance Run free. Train smart. Learn from every session. SUBSCRIPTION TERMS FiT offers an optional auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription at any time in your Apple ID account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.iubenda.com/privacy-policy/39192677

About

Welltra

This app helps athletes and coaches manage training, track wellness, and report injuries. It provides visual data insights on workload and readiness, offering personalized suggestions for performance optimization and injury prevention.

Highlights
  • Daily wellness tracking
  • Detailed training logs
  • Injury reporting
  • Visual data insights (ACWR, readiness)
  • Personalized wellness suggestions
  • Session planning for coaches
  • Comprehensive athlete reports
Features
Read full description

WELLTRA is your ultimate solution for holistic athlete management. This advanced app empowers athletes to log their daily wellness metrics, detailed training logs, and report injuries with ease. By leveraging these inputs, the app provides comprehensive visual data on Acute Chronic Workload Ratio (ACWR), readiness index, and personalized wellness suggestions to optimize performance and prevent injuries. Key Features: - Daily Wellness Tracking: Athletes can effortlessly log their physical and mental wellness, ensuring a complete picture of their overall health. - Training Logs: Record every detail of training sessions, from intensity and duration to specific exercises performed. - Injury Reporting: Quickly report injuries to facilitate prompt attention and effective rehabilitation. - Visual Data Insights: Access detailed visual representations of ACWR and readiness index, helping athletes and coaches make informed decisions. - Wellness Suggestions: Receive tailored recommendations to enhance recovery and maintain peak performance levels. For coaches, WELLTRA offers robust features to streamline training management: - Session Planning: Easily plan and schedule individual or group training sessions. - Comprehensive Reports: Gain access to detailed athlete reports, tracking progress, and identifying areas needing attention. - Progress Sheets: Monitor the development of athletes over time, ensuring they stay on track with their goals. WELLTRA bridges the gap between athletes and coaches, promoting a cohesive and data-driven approach to athletic development and well-being by offering sports science solutions.

Screenshots

Fartlek Interval Trainer4 screens
Welltra3 screens

Verdict

The call

The clearest difference is in-app purchases: Welltra at none against Fartlek Interval Trainer's 4. Welltra also leads on update cadence (daily vs weekly) and iOS requirement (13.4 vs 26.0). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Fartlek Interval Trainer sells 4 in-app purchases, starting at $0.99 per month. Welltra asks for nothing beyond the download.

UpkeepUpdate frequency

Fartlek Interval Trainer ships an update weekly, Welltra daily. The most recent releases landed on October 9, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
Fartlek Interval Trainer versus Welltra: the parameters behind the verdict, then further details
ParameterFartlek Interval TrainerWelltra
PriceFreeFree
Rating—1.0 (1 ratings) — better
Positive reviews75.0% of reviews—
Number of ratings—1 — better
Update frequencyWeeklyDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS26.013.4 — better
Further details — not scored
Size85 MB32 MB
Age rating4+17+
DeveloperRichard EnglishNAMBOR TECHNOLOGIES PRIVATE LIMITED

Customer experience

Fartlek Interval Trainer

Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

Welltra

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

4 purchases

Fartlek Interval Trainer

Subscriptions2
  • Monthly$0.991 Month
  • Annual7 Days trial$6.991 Year
One-time2
  • RemoveAds$0.99
  • Lifetime$14.99
None

Welltra

No in-app purchases

Questions

Is Fartlek Interval Trainer free?
Fartlek Interval Trainer is free to download, with in-app purchases available.
Is Welltra free?
Welltra is free to download, with no in-app purchases.
Do Fartlek Interval Trainer or Welltra have ads?
Neither Fartlek Interval Trainer nor Welltra shows ads.
Which is updated more often, Fartlek Interval Trainer or Welltra?
Fartlek Interval Trainer ships an update weekly, and Welltra daily. Most recently, Fartlek Interval Trainer was updated on October 9, 2026 and Welltra on September 23, 2026.

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