# Strengthiness Interval Timer vs Kiiro

The clearest difference is price: Kiiro at Free against Strengthiness Interval Timer's $0.99. Kiiro also leads on update cadence (fortnightly vs every 5 months) and ratings volume (3 vs 1). Strengthiness Interval Timer's advantage is in-app purchases (none vs 3) and chart position (#187 vs unranked). On rating and ads there is nothing between them.

Kiiro is free to download; Strengthiness Interval Timer costs $0.99 up front. Kiiro sells 3 in-app purchases, starting at $14.99 per month. Strengthiness Interval Timer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Strengthiness Interval Timer against 5.0 for Kiiro. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Strengthiness Interval Timer ships an update every 5 months, Kiiro fortnightly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Strengthiness Interval Timer | Kiiro |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/strengthiness-interval-timer/id707524017/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/kiiro-running-trainer-and-plans/id6749277384/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Best chart rank | **#187** | — |
| Size | 1 MB | 55 MB |
| Requires iOS | **13** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Strengthiness, LLC](https://appshunter.io/developer/579445324) | [endurance101 OÜ](https://appshunter.io/developer/1824960103) |

## What reviewers say

### Strengthiness Interval Timer

[App page](https://appshunter.io/ios/app/strengthiness-interval-timer/id707524017)

**Currently charting:** #187 Top Paid · Health & Fitness (US App Store)

This interval timer offers a straightforward and efficient way to manage your workouts. It supports multiple named sets, unlimited intervals, and provides audio and vibration cues. Ideal for various interval training protocols, it simplifies setup and tracking.

**Highlights:** Super easy setup, Multiple named sets, Unlimited intervals, Countdown and count-up timers, Beep and vibration alerts, Stopwatch with lap counter, Set counter

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

**In-app purchases:** none


### Kiiro

[App page](https://appshunter.io/ios/app/kiiro-running-trainer-and-plans/id6749277384)

This app helps runners understand their training by analyzing data like training load, heart rate zones, and progress. It provides clear insights and warnings to prevent overtraining and ensure effective workouts.

**Highlights:** Training load analysis, Heart rate zone tracking, Progress visualization, VO2 max trends, Automatic route matching, Personal records

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $14.99 | per month |
| Annual | $99.99 | per year |
| Yearly | $99.99 | per year |


## Frequently asked questions

### Is Strengthiness Interval Timer free?

Strengthiness Interval Timer costs $0.99, with no in-app purchases.

### Is Kiiro free?

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

### Which has better reviews, Strengthiness Interval Timer or Kiiro?

Strengthiness Interval Timer and Kiiro are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Strengthiness Interval Timer or Kiiro have ads?

Neither Strengthiness Interval Timer nor Kiiro shows ads.

### Which is updated more often, Strengthiness Interval Timer or Kiiro?

Strengthiness Interval Timer ships an update every 5 months, and Kiiro fortnightly. Most recently, Strengthiness Interval Timer was updated on October 23, 2026 and Kiiro on October 24, 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.*