# Subintervals

> Visualizes and analyzes training data from intervals.icu with interactive graphs. (iPhone/iPad app by Inaki Arroyo Nebreda.)

- Source: https://appshunter.io/ios/app/subintervals/id6479748688 (this page in markdown: same URL + `.md`)
- Developer: [Inaki Arroyo Nebreda](https://appshunter.io/developer/1736987639)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 95 MB
- Languages: American English, Dutch, Indonesian, European Spanish, Italian, German (Germany), French (France), Swedish
- Released: 2024-10-30
- Data updated: 2026-09-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/subintervals/id6479748688/reviews.md

## What is Subintervals?

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.

## Key features

- Detailed activity and event visualization
- Interactive performance graphs
- Seamless intervals.icu sync
- Customizable data analysis
- Actionable training insights

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Big Thanks | $17.99 | one-time |
| Lunch | $11.99 | one-time |
| Sponsor | $44.99 | one-time |
| Coffee | $3.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/subintervals/id6479748688/reviews.md

### 5/5 — Gracias

*2025-01-24, version 1.2.1*

Gracias por compartir algo que podría haber sido un proyecto personal privado. Muy útil para los que usamos intervals!

### 5/5 — Sencilla y fluida

*2024-11-05, version 1.2.0*

Fácil e intuitiva para acceder a los datos rápidamente

## Frequently asked questions about Subintervals

### What is Subintervals?

Subintervals is an independent application designed to provide detailed visualizations and interactive graphs of your training data, syncing directly with intervals.icu to offer actionable insights into your activities and performance.

### Does Subintervals have ads?

No, Subintervals does not contain advertisements, offering an ad-free experience for users focused on their training data analysis.

### What devices does Subintervals support?

Subintervals is available on iPhone, iPad, and iPod, making it accessible across various Apple devices for your training analysis needs.

### How often is Subintervals updated?

The latest version of Subintervals is v1.12.3, and it was last updated on May 11, 2026, indicating a commitment to ongoing development and improvements.

### What is the age rating for Subintervals?

Subintervals has an age rating of 4+, making it suitable for a wide range of users interested in health and fitness tracking.

### How accurate is the data in Subintervals?

Subintervals aims to provide accurate insights by directly visualizing data from intervals.icu. The app's focus is on presenting this existing data through detailed displays and interactive graphs for better understanding.

### Can I integrate Subintervals with other health apps?

While Subintervals seamlessly syncs with intervals.icu, the provided information does not specify direct integration capabilities with other third-party health applications.

### What are the in-app purchases for Subintervals?

The app is free to download and use, with optional in-app purchases available. Specific details on what these purchases unlock are not provided in the current description.

## Version history (last 5 releases)

### v1.19.0 — 2026-08-30

Improvements
- Added metric histograms for heart rate, power, and pace.
- Improved zone labels and ranges.
- Fitness can now show achievements and selected-day activity summaries.

Bug Fixes
- Improved chart cursor snapping and pan gestures.

### v1.18.0 — 2026-08-28

Improvements
- Added a new Power Curve screen with selectable periods, charts, and key-duration values.
- Improved synced chart cursors and tooltip readability across Activity and Fitness.
- Improved zone distributions for power, heart rate, and pace across sports.

Bug Fixes
- Fixed activity chat keyboard positioning.
- Improved chart scrubbing sync and cursor labels.
- Fixed activity stream chart ordering for runs, rowing, and rides.

### v1.17.2 — 2026-08-26

Improvements
- Wellness updates now check for the required WELLNESS:WRITE permission before saving and show a clearer message when access is missing.
- Line chart gradients now align to the actual plot area, so zones, strokes, fills, and backgrounds render more consistently across chart sizes and orientations.
- Activity chat input improvements.
- Fitness chart cursors now snap to the nearest data point, making inline chart values easier to inspect.

Bug Fixes
- Fixed Form so absolute values match Intervals.icu's displayed TSB calculation.
- Fixed wellness saves endpoint.
- Fixed activity chat keyboard avoidance so the keyboard no longer overlaps the message input.
- Fixed chart edge cases around interpolation, null thresholds, zero ticks, and hidden axis rendering.

### v1.17.0 — 2026-08-22

Improvements
- Turn on week totals in Activities display options to see summed training volume for each week on the timeline.
- On the Fitness screen, use Go to today when you've scrolled away from today, toggle Compare with today from display options, and explore charts with improved cursor and gesture handling.
- Log or edit wellness directly from the Activities calendar — tap a day’s wellness area, use the day header action, or choose Log Wellness from the add menu to record metrics like fatigue, mood, soreness, and more.
- Forms across the app share a cleaner, more consistent look — including wellness, workouts, gear, seasons, and the activity chat composer and header.
- Manage Language and Theme from Profile, and sign out from the profile header.

Bug Fixes
- Fixed calendar wellness chips so all supported metrics — fatigue, mood, soreness, stress, motivation, injury, hydration, SpO₂, and readiness — display correctly with clearer icons and labels.
- Fixed activity chart cursors so distance tooltips no longer show negative values when a chart first loads.
- Fixed the Fitness overview cursor on load and when changing the time period, so the selected day stays in sync.
- Fixed Fitness CTL/ATL so it refreshes after activities are created, edited, or deleted.

### v1.15.0 — 2026-08-19

Improvements
- Workout charts and Builder now support Heart Rate and Pace with correct zone labels.
- Compare planned vs. actual activity data with a toggleable target line.
- Choose your app language: English, Spanish, German, French, Italian, Dutch, Swedish, or Indonesian.

Bug Fixes
- Fixed overlapping values when planned and recorded chart data are shown together.

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## More apps by Inaki Arroyo Nebreda

- [WOD Timer](https://appshunter.io/ios/app/wod-timer/id6756797989)

All apps by Inaki Arroyo Nebreda: https://appshunter.io/developer/1736987639

## Related topics

[intervals icu](https://appshunter.io/ios/topics/intervals-icu)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*