Subintervals vs RunningCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Detailed activity and event visualization
- Interactive performance graphs
- Seamless intervals.icu sync
- Customizable data analysis
- Actionable training insights
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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.
RunningCalc
This app helps runners calculate and convert running pace, speed, distance, and time. It offers features like pace calculation, pace band generation, and split analysis to aid in workout planning and race preparation.
- Pace, speed, and distance calculation
- Customizable pace band generator
- Split analysis for runs
- Cheat sheet creator for pace/speed conversion
- Flexible unit support (km, miles, km/h, mph)
- Light and dark mode
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RunningCalc lets you convert and calculate running pace, speed, distance and time with a clean and easy to use interface with quick input. Plan workouts, analyze splits, create custom pace bands, and instantly convert between pace, speed, and distance. * Pace Calculator: Instantly convert pace, speed and distance by setting any value. Calculate pace, speed, or time by setting any two values. The intuitive locking system lets you fine-tune your calculations on the fly. * Pace Band Generator: Create personalized, printable pace bands for your races. Set your target distance and time, define split lengths, generate a band and print it to keep you on track. * Cheat Sheet Creator: Build custom pace-to-speed (and vice-versa) conversion charts for quick reference. Ideal for knowing your target treadmill speed. * Split Calculator: Track and analyze every segment of your run. Select specific splits to see their combined stats for targeted analysis. Perfect after treadmill sessions or interval training to get the total distance run or calculate the average pace for intervals. Easy to Use: Clean, intuitive interface designed for quick input, even when you're mid-workout. Customizable: Tailor distance presets for both the Pace Calculator and Pace Band to your common running distances. Flexible Units: Seamlessly work with kilometers, miles, km/h, and mph. Light & Dark Mode: Adapts to your system's appearance for comfortable viewing. No ads, no subscriptions – just powerful features to support your running journey.
Screenshots
Verdict
The clearest difference is in-app purchases: RunningCalc at none against Subintervals's 4. Subintervals's advantage is iOS requirement (15.1 vs 17.6). On price, rating, ratings volume and update cadence 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
Both are free to download. Subintervals sells 4 one-off in-app purchases. RunningCalc asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Subintervals against 5.0 for RunningCalc. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
Subintervals ships an update weekly, RunningCalc every 5 days. The most recent releases landed on September 10, 2026 and June 11, 2026 respectively.
| Parameter | Subintervals | RunningCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Weekly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 95 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Inaki Arroyo Nebreda | Byung Hyun Martin Larvia |
Customer experience
Subintervals
RunningCalc
In-app purchases
Subintervals
- Coffee$3.99
- Lunch$11.99
- Big Thanks$17.99
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- Sponsor$44.99
RunningCalc
No in-app purchases









