# Strengthiness Interval Timer vs Silent Sleep Training

The clearest difference is price: Silent Sleep Training at Free against Strengthiness Interval Timer's $0.99. Strengthiness Interval Timer's advantage is chart position (#174 vs unranked) and iOS requirement (13 vs 16.5). On update cadence, ads, in-app purchases and device support there is nothing between them.

Silent Sleep Training is free to download; Strengthiness Interval Timer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Strengthiness Interval Timer ships an update every 5 months, Silent Sleep Training every 4 months. The most recent releases landed on October 1, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Strengthiness Interval Timer | Silent Sleep Training |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/strengthiness-interval-timer/id707524017/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | Paid | — |
| Best chart rank | **#174** | — |
| Size | 1 MB | 48 MB |
| Requires iOS | **13** | 16.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Strengthiness, LLC](https://appshunter.io/developer/579445324) | [Asate AG](https://appshunter.io/developer/1552068271) |

## What reviewers say

### Strengthiness Interval Timer

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

**Currently charting:** #174 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


### Silent Sleep Training

[App page](https://appshunter.io/ios/app/silent-sleep-training/id1552068269)

**In-app purchases:** none


## Frequently asked questions

### Is Strengthiness Interval Timer free?

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

### Is Silent Sleep Training free?

Silent Sleep Training is free to download, with no in-app purchases.

### Do Strengthiness Interval Timer or Silent Sleep Training have ads?

Neither Strengthiness Interval Timer nor Silent Sleep Training shows ads.

### Which is updated more often, Strengthiness Interval Timer or Silent Sleep Training?

Strengthiness Interval Timer ships an update every 5 months, and Silent Sleep Training every 4 months. Most recently, Strengthiness Interval Timer was updated on October 1, 2026 and Silent Sleep Training on September 28, 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.*