# 3D STEREOVISION TIME MACHINE 2 vs Grav Box

The clearest difference is in-app purchases: 3D STEREOVISION TIME MACHINE 2 at none against Grav Box's 10. 3D STEREOVISION TIME MACHINE 2 also leads on ads (none vs shown) and iOS requirement (9.0 vs 14.0). Grav Box's advantage is ratings volume (26 vs 2). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Grav Box sells 10 one-off in-app purchases. 3D STEREOVISION TIME MACHINE 2 asks for nothing beyond the download.

3D STEREOVISION TIME MACHINE 2 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Grav Box has 26 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of 3D STEREOVISION TIME MACHINE 2's written reviews are positive against 96% of Grav Box's.

3D STEREOVISION TIME MACHINE 2 ships an update every 3 months, Grav Box every 5 months. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 3D STEREOVISION TIME MACHINE 2 | Grav Box |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/3d-stereovision-time-machine-2/id432270029/reviews)** | [4.8 (26 ratings)](https://appshunter.io/ios/app/grav-box/id1050320618/reviews) |
| Number of ratings | 2 | **26** |
| Positive reviews | **100.0% of reviews** | 96.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 60 MB | 10 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [John Avatar](https://appshunter.io/developer/375690746) | [Gianluca Capraro](https://appshunter.io/developer/1691787728) |

## What reviewers say

### 3D STEREOVISION TIME MACHINE 2

[App page](https://appshunter.io/ios/app/3d-stereovision-time-machine-2/id432270029)

Explore historical moments and figures through immersive 3D stereoscopic images. View iconic figures and events from over 150 years ago in a unique, interactive format.

**Highlights:** 3D stereoscopic image viewing, Flipvision animations, Historical portraits and scenes, Vintage music background, Interactive image navigation

**Features:** macOS Compatibility

**In-app purchases:** none


### Grav Box

[App page](https://appshunter.io/ios/app/grav-box/id1050320618)

Control gravity with a tap and hold to manipulate objects. Customize their appearance, explore dynamic physics, and engage in arcade challenges with leaderboards and achievements.

**Highlights:** Tap and hold to control gravity, Customize grav colors and emojis, Dynamic backgrounds and physics effects, Arcade mode with achievements, Global leaderboards, In-game events like black holes

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gold Blocks (100) Pack | $0.99 | one-time |
| Light Portal | $0.99 | one-time |
| Dark Portal | $0.99 | one-time |
| Grav Box | $0.99 | one-time |
| Midnight | $0.99 | one-time |
| Daybreak | $0.99 | one-time |
| Beach | $0.99 | one-time |
| Jungle | $0.99 | one-time |
| Mist | $0.99 | one-time |
| Gold Blocks (1000) Pack | $4.99 | one-time |


## Frequently asked questions

### Is 3D STEREOVISION TIME MACHINE 2 free?

3D STEREOVISION TIME MACHINE 2 is free to download, with no in-app purchases.

### Is Grav Box free?

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

### Which has better reviews, 3D STEREOVISION TIME MACHINE 2 or Grav Box?

3D STEREOVISION TIME MACHINE 2 is rated higher. 3D STEREOVISION TIME MACHINE 2 averages 5.0 out of 5 from 2 ratings, while Grav Box averages 4.8 from 26 ratings.

### Do 3D STEREOVISION TIME MACHINE 2 or Grav Box have ads?

Grav Box shows ads; 3D STEREOVISION TIME MACHINE 2 does not.

### Which is updated more often, 3D STEREOVISION TIME MACHINE 2 or Grav Box?

3D STEREOVISION TIME MACHINE 2 ships an update every 3 months, and Grav Box every 5 months. Most recently, 3D STEREOVISION TIME MACHINE 2 was updated on October 19, 2026 and Grav Box 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.*