Comparison

Fartlek Interval Trainer vs Unit One Gym Training

Price, ratings, monetisation and update history for both apps, side by side β€” 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 workoutsβ€”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 deviceβ€”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 β€’ Flexible interval timer for running, HIIT and Tabata β€’ Automatic Fartlek interval detection β€’ Dual-ring live workout progress β€’ Color-coded pace and effort feedback β€’ Localized spoken coaching, plus audio and haptic alerts β€’ Create and edit interval workouts on Apple Watch β€’ Detailed pace, heart rate, cadence and distance metrics β€’ Performance tracking for every interval β€’ Workout comparisons and personalized insights β€’ Sprint, hard, moderate and easy effort levels β€’ Apple Health and Strava integration β€’ 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

Unit One Gym Training

Features
Read full description

The Unit One Gym Training app brings real coaching into your pocket. Built for members of Unit One Gym in Guiseley, Leeds, this app connects you directly to our coaching team, your training plan and your progress β€” all in one place. Whether you are on the gym floor or training away from the facility, you stay structured, accountable and moving forward. What you can expect: Structured Training Plans Programmes designed by our coaching team, tailored to your goals and experience level. Progress Tracking Log sessions, track performance and see your progress over time. Direct Coach Support Stay connected with your coach, receive feedback and make adjustments when needed. Accountability & Routine Stay consistent with clear direction and a plan that evolves as you do. Seamless Gym Integration Everything you do in the gym links back to your programme and long-term progress. This is not a generic fitness app. It is an extension of the Unit One Gym experience β€” built around coaching, structure and results. If you train with us, this is how you get more from it.

Screenshots

Fartlek Interval Trainer4 screens
Unit One Gym Training4 screens

Verdict

The call

The clearest difference is in-app purchases: Unit One Gym Training at none against Fartlek Interval Trainer's 4. Unit One Gym Training also leads on device support (4 vs 2) and iOS requirement (15.5 vs 26.0). On price, update cadence and ads there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

Fartlek Interval Trainer ships an update every 9 days, Unit One Gym Training every 2 weeks. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

Scorecard3 real differences Β· 5 level
Fartlek Interval Trainer versus Unit One Gym Training: the parameters behind the verdict, then further details
ParameterFartlek Interval TrainerUnit One Gym Training
PriceFreeFree
Positive reviews75.0% of reviewsβ€”
Update frequencyEvery 9 days β€” betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo β€” better
MonetizationFreemiumβ€”
DevicesiPhone, Apple WatchiPhone, iPad, iPod, Apple Watch β€” better
Requires iOS26.015.5 β€” better
Further details β€” not scored
Size86 MB198 MB
Age rating4+4+
DeveloperRichard EnglishUNIT ONE GYM (GUISELEY) LTD

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

Unit One Gym Training

No in-app purchases

Questions

Is Fartlek Interval Trainer free?
Fartlek Interval Trainer is free to download, with in-app purchases available.
Is Unit One Gym Training free?
Unit One Gym Training is free to download, with no in-app purchases.
Do Fartlek Interval Trainer or Unit One Gym Training have ads?
Neither Fartlek Interval Trainer nor Unit One Gym Training shows ads.
Which is updated more often, Fartlek Interval Trainer or Unit One Gym Training?
Fartlek Interval Trainer ships an update every 9 days, and Unit One Gym Training every 2 weeks. Most recently, Fartlek Interval Trainer was updated on October 24, 2026 and Unit One Gym Training on October 17, 2026.

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