# JGAP vs Invisible Ground

The clearest difference is rating: Invisible Ground at 5.0 against JGAP's 4.0. JGAP's advantage is update cadence (every 2 days vs every 8 months) and iOS requirement (10.0 vs 15.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Invisible Ground holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 6 and 4 respectively.

JGAP ships an update every 2 days, Invisible Ground every 8 months. The most recent releases landed on October 10, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | JGAP | Invisible Ground |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (6 ratings)](https://appshunter.io/ios/app/jgap/id1494328186/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/invisible-ground/id1611178239/reviews)** |
| Number of ratings | **6** | 4 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 8 months |
| Monetization | Free | Free |
| Size | 84 MB | 543 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SpocksClub](https://appshunter.io/developer/413642306) | [Brian Koscho](https://appshunter.io/developer/1611178241) |

## What reviewers say

### JGAP

[App page](https://appshunter.io/ios/app/jgap/id1494328186)

Explore the universe with this interactive guide to an astronomy park's outdoor plaza. Learn about celestial movements, star positions, and the solar system through engaging features designed for public interaction and education.

**Highlights:** Interactive plaza features, Learn about the Sun and Earth's movement, Understand star positions, Explore the solar system's scale, Public access to observatory and plaza

**Features:** macOS Compatibility

**In-app purchases:** none


### Invisible Ground

[App page](https://appshunter.io/ios/app/invisible-ground/id1611178239)

Experience local history through augmented reality and immersive audio storytelling. Explore historical sites with digital overlays and listen to place-based documentaries that bring the past to life in the exact locations where events occurred.

**Highlights:** Augmented reality historical site overlays, Place-based documentary audio stories, Multisensory historical engagement, Explore community history, Immersive storytelling experience

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JGAP free?

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

### Is Invisible Ground free?

Invisible Ground is free to download, with no in-app purchases.

### Which has better reviews, JGAP or Invisible Ground?

Invisible Ground is rated higher. JGAP averages 4.0 out of 5 from 6 ratings, while Invisible Ground averages 5.0 from 4 ratings.

### Do JGAP or Invisible Ground have ads?

Neither JGAP nor Invisible Ground shows ads.

### Which is updated more often, JGAP or Invisible Ground?

JGAP ships an update every 2 days, and Invisible Ground every 8 months. Most recently, JGAP was updated on October 10, 2026 and Invisible Ground on September 17, 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.*