# Justfit vs IntervalTimer Duo

The clearest difference is update cadence: Justfit at every 3 days against IntervalTimer Duo's every 3 weeks. Justfit also leads on iOS requirement (15.0 vs 26.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Justfit sells 4 in-app purchases, starting at $1.99 per month and IntervalTimer Duo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Justfit ships an update every 3 days, IntervalTimer Duo every 3 weeks. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Justfit | IntervalTimer Duo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/justfit-interval-timer-clock/id6449503037/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 104 MB | 10 MB |
| Requires iOS | **15.0** | 26.1 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Ferda Nahit Fidanci](https://appshunter.io/developer/1689464732) | [kosuke konuma](https://appshunter.io/developer/1767116232) |

## What reviewers say

### Justfit

[App page](https://appshunter.io/ios/app/justfit-interval-timer-clock/id6449503037)

This app provides customizable interval timers for various activities like HIIT, Tabata, meditation, and studying. Track your progress with detailed history and analytics, and personalize your experience with custom sounds and colors.

**Highlights:** Fully customizable interval timers, Full-screen circular countdown/countup stopwatch, Pre-made templates for HIIT, Tabata, Meditation, Customizable audio for intervals, sets, and rest, Detailed progress tracking and analytics, Timer sharing via export/import, Multilanguage support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $7.99 | per year |
| Lifetime Access | $3.99 | one-time |
| Lifetime Access | $7.99 | one-time |


### IntervalTimer Duo

[App page](https://appshunter.io/ios/app/intervaltimer-duo/id6753626424)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


## Frequently asked questions

### Is Justfit free?

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

### Is IntervalTimer Duo free?

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

### Do Justfit or IntervalTimer Duo have ads?

Neither Justfit nor IntervalTimer Duo shows ads.

### Which is updated more often, Justfit or IntervalTimer Duo?

Justfit ships an update every 3 days, and IntervalTimer Duo every 3 weeks. Most recently, Justfit was updated on October 3, 2026 and IntervalTimer Duo on October 9, 2026.

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