# Selfloops Spark vs Sleep Time Calc

The clearest difference is in-app purchases: Sleep Time Calc at none against Selfloops Spark's 1. Sleep Time Calc also leads on iOS requirement (14.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Selfloops Spark sells 1 in-app purchase, starting at $69.99 per year. Sleep Time Calc asks for nothing beyond the download.

## The numbers

| Metric | Selfloops Spark | Sleep Time Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (13 ratings)](https://appshunter.io/ios/app/selfloops-spark/id1282997660/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 25.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 44 MB | 1 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SELFLOOPS SNC DI DEL ROSSO CHRISTIAN E RIBICHINI PIERO](https://appshunter.io/developer/911739721) | [Pavel Moslienko](https://appshunter.io/developer/1452430456) |

## What reviewers say

### Selfloops Spark

[App page](https://appshunter.io/ios/app/selfloops-spark/id1282997660)

This app helps athletes and fitness enthusiasts track, analyze, and optimize their workouts. It offers personalized training plans, goal setting, and performance insights. Connect with coaches and other users for motivation and feedback.

**Highlights:** Workout tracking and analysis, Fitness challenges and goal setting, Personalized training plans, Heart rate monitoring, RPE logging, Data syncing with Apple Health, Advanced performance analytics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Athlete Premium | $69.99 | per year |


### Sleep Time Calc

[App page](https://appshunter.io/ios/app/sleep-time-calc/id1480080607)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Selfloops Spark free?

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

### Is Sleep Time Calc free?

Sleep Time Calc is free to download, with no in-app purchases.

### Do Selfloops Spark or Sleep Time Calc have ads?

Neither Selfloops Spark nor Sleep Time Calc shows ads.

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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.*