4th Wall vs BOB Shrine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
4th Wall
Experience public art in augmented reality. Discover curated AR exhibitions at significant locations or place 3D artworks in your own environment. Engage with art that activates historical sites and inspires dialogue.
- Augmented reality public art exhibitions
- Site-specific AR artworks
- Place 3D dimensional drawings
- Record and share AR creations
- Explore historically significant sites
- Sound integration for artworks
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4th Wall is a free, augmented reality (AR) public art platform exploring inclusive creative expression. “Coordinates” hosts an ongoing series of curated, collaborative, site specific, public AR art exhibitions. Users are invited to be physically present at specific locations to experience AR artworks in situ. When users select the Coordinates feature, based on their location, they will be directed toward artworks – translated into AR-- created by artists that activate the historically, politically or culturally significant sites they have chosen. “Coordinates” aims to inspire thoughtful dialogue and expand our understanding of public art. By pressing the AR Artworks button, users can view, explore and place Nancy Baker Cahill’s dimensional drawings in the environment of their choice. Drawings can be rotated, scaled, placed and recorded by user. What’s New - A more streamlined experience for the user, with the removal of the hologram, studio experience and Desert X exhibition buttons and an expansion of the curated and site-specific “Coordinates” AR public art exhibitions platform. - Artworks may include sound so make sure to check for the new orange sound button at the top of the menu when observing an artwork on site. - The “Refresh” button updates the nearest artwork depending on the user’s location. - The “About” button directs users to the home page for 4thwallapp.org. Users can re-enter the app by tapping the text, “4th Wall” at the upper left hand corner of their screens. 4th Wall App is available on iPhone 6s iOS11 or above. Founding artist and Creative Director: Nancy Baker Cahill App Developer: Drive Studios ©nancybakercahill2019
BOB Shrine
Create offerings for an AI creature named BOB, inspired by an art installation. Name your shrine, select offerings, and add lessons. The app automates the production of your offerings as stimuli for BOB to experience.
- Create offerings for AI creature BOB
- Name and customize your shrine
- Choose from a variety of offerings
- Caption offerings with parental lessons
- Automated stimulus production for BOB
- Experience an interactive art installation
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BOB Shrine allows you to make offerings to BOB (Bag of Beliefs), an AI-based creature by Ian Cheng. Name your shrine and choose from a growing variety of offerings. Caption your offering with a parental lesson. BOB Shrine will automate the production of your offering into an ongoing pattern of stimuli for BOB to receive. If your BOB Shrine makes enough offerings, maybe one day BOB will visit… BOB Shrine coincides with the United States premiere of BOB at Gladstone Gallery, New York. The first in a new series of artificial lifeforms, BOB takes the form of a chimeric branching serpent. For more information, please visit BOBS.AI
Screenshots
Verdict
The clearest difference is review sentiment: BOB Shrine at 100% against 4th Wall's 67%. BOB Shrine also leads on rating (4.9 vs 4.5) and iOS requirement (11.0 vs 15.0). 4th Wall's advantage is ratings volume (42 vs 14). On price, update cadence, 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.
BOB Shrine holds the better App Store score, 4.9 against 4.5. Both are backed by a comparable volume of ratings — 42 and 14 respectively. Written reviews point the same way: 67% of 4th Wall's written reviews are positive against 100% of BOB Shrine's.
Both ship on a similar rhythm, roughly every 11 days. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | 4th Wall | BOB Shrine |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (42 ratings) | 4.9 (14 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 42 — better | 14 |
| Update frequency | Every 11 days | Every 11 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 298 MB | 87 MB |
| Age rating | 12+ | 4+ |
| Developer | Nancy Baker Cahill Studio, Inc | Ian Cheng |
Customer experience
4th Wall
BOB Shrine
In-app purchases
4th Wall
No in-app purchases
BOB Shrine
No in-app purchases









