JGAP vs Invisible Ground
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JGAP
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.
- 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
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The John Glenn Astronomy Park is an outdoor facility in the Hocking Hills State Park. It is 12 miles south of Logan, Ohio, about an hour from Columbus. On site, there is an observatory and an outdoor Plaza that is open to the public at all hours. The layout of the Plaza of the John Glenn Astronomy Park (JGAP) is designed to teach you about, and help you interact with, our universe. Our app, the JGApp, teaches you about the many features of our plaza, and how to use them to appreciate the movement of the Sun and Earth, the position of the stars, and the scale of the bodies in our solar system.
Invisible Ground
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.
- Augmented reality historical site overlays
- Place-based documentary audio stories
- Multisensory historical engagement
- Explore community history
- Immersive storytelling experience
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Invisible Ground is an Athens, Ohio-based multimedia project that utilizes audio, augmented reality, visual elements, and place-based storytelling to engage people in their communities' history. Invisible Ground has successfully created 17 Immersive Historic Sites and documentary-style podcast episodes at locations across southeast Ohio. The project focuses on the region's diverse history and the stories of everyday people, places, and events in southeast Ohio. After downloading the Invisible Ground app on their mobile device, participants will access an augmented reality view of the historical site, where a digital image of the past is overlaid on the present-day camera view. The accompanying Invisible Ground podcast highlights these stories through engaging, place-based documentary storytelling. The audio in the Invisible Ground app provides the audience with an experience that podcast audio alone cannot offer, as it enables them to hear the voices connected to the story while in the same physical space. It is a multisensory storytelling experience designed to bring the past to life.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | JGAP | Invisible Ground |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (6 ratings) | 5.0 (4 ratings) — better |
| Number of ratings | 6 — better | 4 |
| Update frequency | Every 2 days — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 84 MB | 543 MB |
| Age rating | 4+ | 4+ |
| Developer | SpocksClub | Brian Koscho |
Customer experience
JGAP
Invisible Ground
In-app purchases
JGAP
No in-app purchases
Invisible Ground
No in-app purchases







