# GriGri3D Stereogram vs PowerTread

The clearest difference is price: PowerTread at Free against GriGri3D Stereogram's $2.99. PowerTread also leads on rating (5.0 vs 4.5) and review sentiment (100% vs 87%). GriGri3D Stereogram's advantage is in-app purchases (none vs 1) and ratings volume (12 vs 2). On ads and device support there is nothing between them.

PowerTread is free to download; GriGri3D Stereogram costs $2.99 up front. PowerTread sells 1 one-off in-app purchase. GriGri3D Stereogram asks for nothing beyond the download.

PowerTread holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: GriGri3D Stereogram has 12 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 87% of GriGri3D Stereogram's written reviews are positive against 100% of PowerTread's.

## The numbers

| Metric | GriGri3D Stereogram | PowerTread |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.5 (12 ratings)](https://appshunter.io/ios/app/grigri3d-stereogram/id1205203474/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/powertread-treadmill-training/id6751471581/reviews)** |
| Number of ratings | **12** | 2 |
| Positive reviews | 86.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 62 MB | 45 MB |
| Requires iOS | **9.1** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Masataka Hakozaki](https://appshunter.io/developer/323346554) | [NoVa Solutions Group, LLC](https://appshunter.io/developer/1815047312) |

## What reviewers say

### GriGri3D Stereogram

[App page](https://appshunter.io/ios/app/grigri3d-stereogram/id1205203474)

Explore hidden 3D objects within stereograms using intuitive touch controls for rotation and scaling. This app also offers a parallel view method to help relax tired eyes. Customize view methods, depth, and patterns in real-time with a collection of beautiful patterns and 3D models.

**Highlights:** Interactive 3D object viewing, One-finger rotation, Pinch-to-scale functionality, Parallel view for eye relaxation, Real-time customization of view settings, Collection of 30+ patterns and 3D models

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

**In-app purchases:** none


### PowerTread

[App page](https://appshunter.io/ios/app/powertread-treadmill-training/id6751471581)

Simulate real-world terrain and power-based running on your treadmill. This app offers structured workouts, automatic incline control, and performance tracking to prepare you for races. Sync your data with Apple Health for comprehensive training insights.

**Highlights:** GPX course simulation, Automatic incline control, Power-based running metrics, Structured interval workouts, Apple Health integration, FTMS-compatible treadmill support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PowerTread Pro | $24.99 | one-time |


## Frequently asked questions

### Is GriGri3D Stereogram free?

GriGri3D Stereogram costs $2.99, with no in-app purchases.

### Is PowerTread free?

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

### Which has better reviews, GriGri3D Stereogram or PowerTread?

PowerTread is rated higher. GriGri3D Stereogram averages 4.5 out of 5 from 12 ratings, while PowerTread averages 5.0 from 2 ratings.

### Do GriGri3D Stereogram or PowerTread have ads?

Neither GriGri3D Stereogram nor PowerTread 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.*