# interval timer hiit or running vs FlexDay

The clearest difference is price: FlexDay at Free against interval timer hiit or running's $0.99. interval timer hiit or running's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 18.6). On update cadence, ads and device support there is nothing between them.

FlexDay is free to download; interval timer hiit or running costs $0.99 up front. FlexDay sells 1 in-app purchase, starting at $14.99 per year. interval timer hiit or running asks for nothing beyond the download.

interval timer hiit or running ships an update every 3 weeks, FlexDay every 5 weeks. The most recent releases landed on September 17, 2026 and September 2, 2026 respectively.

## The numbers

| Metric | interval timer hiit or running | FlexDay |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flexday/id6746876893/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 564 MB |
| Requires iOS | **15.6** | 18.6 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Sylvain Huon](https://appshunter.io/developer/1552904209) | [OnlyAI Ltd](https://appshunter.io/developer/1818888386) |

## What reviewers say

### interval timer hiit or running

[App page](https://appshunter.io/ios/app/interval-timer-hiit-or-running/id6447249321)

This interval timer app helps you set up HIIT, workout, or running sessions quickly. Customize workout and rest times, with visual cues and optional sound/vibration alerts. It works in the background, allowing you to use other apps simultaneously.

**Highlights:** Customizable interval timers, Visual phase indicators, Sound and vibration alerts, Background operation, Minimalist user interface, Supports Apple Watch

**Features:** Apple Watch app

**In-app purchases:** none


### FlexDay

[App page](https://appshunter.io/ios/app/flexday/id6746876893)

This app offers guided stretching routines for various needs, from morning energizers to post-workout recovery. It features over 70 exercises, smart scheduling, progress tracking, and Apple Health integration. Stretch anywhere, anytime, with offline access.

**Highlights:** 70+ stretching exercises, Guided routines with visual instructions, Smart calendar scheduling, Progress tracking and milestones, Apple Health integration, Offline access

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FlexDay Premium | $14.99 | per year |


## Frequently asked questions

### Is interval timer hiit or running free?

interval timer hiit or running costs $0.99, with no in-app purchases.

### Is FlexDay free?

FlexDay is free to download, with in-app purchases available.

### Do interval timer hiit or running or FlexDay have ads?

Neither interval timer hiit or running nor FlexDay shows ads.

### Which is updated more often, interval timer hiit or running or FlexDay?

interval timer hiit or running ships an update every 3 weeks, and FlexDay every 5 weeks. Most recently, interval timer hiit or running was updated on September 17, 2026 and FlexDay on September 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*