# Spark SLO vs Stability Studio

Spark SLO and Stability Studio both sit at 5.0 stars, but that hides the real split: 100% of Spark SLO's written reviews are positive against 50% of Stability Studio's. Spark SLO also leads on ratings volume (555 vs 112). Stability Studio's advantage is monetization model (free vs ad-supported). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Spark SLO against 5.0 for Stability Studio. Both are backed by a comparable volume of ratings — 555 and 112 respectively. Written reviews are what separate them: 100% of Spark SLO's written reviews are positive against 50% of Stability Studio's.

Spark SLO ships an update monthly, Stability Studio every 3 weeks. Both last shipped on November 7, 2026.

## The numbers

| Metric | Spark SLO | Stability Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (555 ratings)](https://appshunter.io/ios/app/spark-slo/id1523088322/reviews) | **[5.0 (112 ratings)](https://appshunter.io/ios/app/stability-studio/id1535063730/reviews)** |
| Number of ratings | **555** | 112 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 38 MB | 38 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nick and Steph Young LLC](https://appshunter.io/developer/1497625125) | [Stability Fitness](https://appshunter.io/developer/1535063732) |

## What reviewers say

### Spark SLO

[App page](https://appshunter.io/ios/app/spark-slo/id1523088322)

This app offers a supportive environment for yoga practice, encouraging freedom of expression, playfulness, and compassion. It aims to foster personal growth through inward exploration in a judgment-free space.

**Highlights:** Supportive family-based yoga, Freedom of expression, Playfulness and compassion, Inward exploration, Judgment-free space

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

**In-app purchases:** none


### Stability Studio

[App page](https://appshunter.io/ios/app/stability-studio/id1535063730)

This app offers on-demand Pilates Reformer and Barre fitness classes. Experience low-impact workouts with high-impact results, fostering fitness and community.

**Highlights:** Pilates Reformer classes, Barre Fitness classes, On-demand workouts, Low-impact fitness, Community focus

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

**In-app purchases:** none


## Frequently asked questions

### Is Spark SLO free?

Spark SLO is free to download, with no in-app purchases.

### Is Stability Studio free?

Stability Studio is free to download, with no in-app purchases.

### Which has better reviews, Spark SLO or Stability Studio?

Stability Studio is rated higher. Spark SLO averages 5.0 out of 5 from 555 ratings, while Stability Studio averages 5.0 from 112 ratings.

### Do Spark SLO or Stability Studio have ads?

Neither Spark SLO nor Stability Studio shows ads.

### Which is updated more often, Spark SLO or Stability Studio?

Spark SLO ships an update monthly, and Stability Studio every 3 weeks. Most recently, Spark SLO was updated on November 7, 2026 and Stability Studio on November 7, 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.*