Comparison

Subintervals vs Marathon Buddy

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

Head to head
About

Subintervals

Visualize your training data with detailed displays and interactive graphs. Customize your analysis and sync seamlessly with intervals.icu for up-to-the-minute insights into activities, events, and performance metrics.

Highlights
  • Detailed activity and event visualization
  • Interactive performance graphs
  • Seamless intervals.icu sync
  • Customizable data analysis
  • Actionable training insights
Features
Read full description

Elevate Your Training with Subintervals Subintervals transforms your intervals.icu data into actionable insights. This app brings your training activities, events, and performance metrics to life through detailed displays and interactive graphs. Customise and control your data for a tailored analysis, and seamlessly sync with intervals.icu for up-to-the-minute information. Key Features: - Detailed visualisation of activities and events. - Dynamic, interactive graphs for performance tracking. - Effortless sync with intervals.icu. Please note that it is an independent application developed by an enthusiast keen on providing a complementary tool to the official platform.

About

Marathon Buddy

Features
Read full description

Train smarter, run faster, and finish strong with Marathon Buddy – the intelligent running coach powered by the proven Jack Daniels' VDOT formula. Are you tired of generic "one-size-fits-all" PDF plans? Do you train hard but don't see results? Marathon Buddy brings elite-level coaching methodology to your pocket, adapting specifically to your current fitness level and goals. Whether you are targeting your first 5K finish or aiming for a Boston Qualifier marathon time, our scientific approach ensures every mile has a purpose. WHY MARATHON BUDDY? 1. The Science of VDOT We don't guess your pace; we calculate it. Based on your recent race performance, we determine your "VDOT" (running economy score). This allows us to prescribe the exact paces you need to hit for Easy runs, Threshold intervals, and Repetitions to maximize physiological adaptation without overtraining. 2. Adaptive Race Plans Our training engine builds a complete periodized schedule leading up to your race day: • Base Phase: Build your aerobic foundation and injury resistance. • Quality Phase: Introduce threshold and interval work to boost your lactate threshold and VO2 max. • Peak Phase: Sharpen your speed and simulate race conditions. • Taper Phase: Scientifically reduce volume to ensure you arrive at the start line fresh and ready. CORE FEATURES Dynamic Audio Coach Leave your phone in your pocket. Our audio coach guides you through complex interval workouts, announcing pace targets, rest periods, and splits. • "Run 2 minutes at 4:30/km" • "Recover for 1 minute" • "You are on pace!" Advanced VDOT Calculator • Pace Zones: Instantly see your Easy (E), Marathon (M), Threshold (T), Interval (I), and Repetition (R) paces. • Race Potential: Predicting your marathon time based on a fresh 5K result has never been this accurate. Know exactly what you are capable of before race day. • Equivalent Times: See how your 10K time translates to other distances. Precision Tracking (Dual-Mode) • Outdoor GPS: High-accuracy GPS tracking with real-time map visualization, pace charts, and mile/km splits. • Treadmill Mode: A dedicated interface for indoor runners. Manually log your treadmill metrics or connect to compatible Bluetooth FTMS stride sensors (coming soon) to keep your digital logbook complete. Health & Progress Monitoring • Weekly Check-ins: Log your fatigue levels, sleep quality, and soreness. The app learns from you. • Volume Analysis: Track your weekly mileage trends to prevent the "Too Much, Too Soon" injury trap. • Personal Bests: Automatically detect and celebrate your fastest efforts from 1K to Full Marathon. Designed for Focus • Dark Mode: Easy on the eyes for those early morning or late night runs. • Privacy First: Your GPS data and training history live on your device. We don't sell your data to advertisers. • Battery Efficient: Optimized to track long runs without draining your battery. WHO IS THIS FOR? • Beginners: Who need structure and guidance to finish their first race safely. • Intermediates: Stuck at a plateau? Use structured interval training to break through. • Serious Runners: Who want a digital tool that respects the serious methodology of Daniel's Running Formula. SUBSCRIPTION PRICING & TERMS Marathon Buddy offers a free trial for all new users to experience the full power of adaptive training. • Free Version: Access to the VDOT Calculator, basic GPS tracking, and single-run logging. • Premium: Unlocks the full adaptive Training Plan, advanced workout analysis, and future plan adjustments. Subscriptions are available as a monthly or annual auto-renewable subscription. Subscription Options: - Monthly: $14.99/month - Annual: $99.99/year (equivalent to $8.33/month, save 44%) Privacy Policy: https://services.treadmillbuddy.com/marathon/static/privacy-policy.html Support: https://services.treadmillbuddy.com/marathon/static/support.html Website: https://services.treadmillbuddy.com/marathon/static/index.html

Screenshots

Subintervals4 screens
Marathon Buddy4 screens

Verdict

The call

The clearest difference is update cadence: Marathon Buddy at every 3 days against Subintervals's weekly. Marathon Buddy also leads on iOS requirement (13.0 vs 16.4). On price, ads, in-app purchases 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. Subintervals sells 4 one-off in-app purchases and Marathon Buddy sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Subintervals ships an update weekly, Marathon Buddy every 3 days. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

Scorecard2 real differences · 8 level
Subintervals versus Marathon Buddy: the parameters behind the verdict, then further details
ParameterSubintervalsMarathon Buddy
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyWeeklyEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.413.0 — better
Further details — not scored
Size109 MB97 MB
Age rating4+4+
DeveloperInaki Arroyo Nebreda群 谢

In-app purchases

4 purchases

Subintervals

One-time4
  • Coffee$3.99
  • Lunch$11.99
  • Big Thanks$17.99
Show 1 more
  • Sponsor$44.99
2 purchases

Marathon Buddy

Subscriptions2
  • Monthly Plan14 Days trial$9.991 Month
  • Annual Plan14 Days trial$99.991 Year

Questions

Is Subintervals free?
Subintervals is free to download, with in-app purchases available.
Is Marathon Buddy free?
Marathon Buddy is free to download, with in-app purchases available.
Do Subintervals or Marathon Buddy have ads?
Neither Subintervals nor Marathon Buddy shows ads.
Which is updated more often, Subintervals or Marathon Buddy?
Subintervals ships an update weekly, and Marathon Buddy every 3 days. Most recently, Subintervals was updated on October 16, 2026 and Marathon Buddy on October 4, 2026.

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