# The Mp3 Experiment vs 4th Wall

The clearest difference is rating: 4th Wall at 4.5 against The Mp3 Experiment's 3.8. 4th Wall also leads on update cadence (every 11 days vs every 9 months) and ratings volume (42 vs 12). The Mp3 Experiment's advantage is review sentiment (78% vs 67%). On price, ads, in-app purchases and monetization model there is nothing between them.

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

4th Wall holds the better App Store score, 4.5 against 3.8. Both are backed by a comparable volume of ratings — 12 and 42 respectively. Written reviews complicate that: 78% of The Mp3 Experiment's written reviews are positive against 67% of 4th Wall's, so the app with the better star average is not the one people write more warmly about.

The Mp3 Experiment ships an update every 9 months, 4th Wall every 11 days. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | The Mp3 Experiment | 4th Wall |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (12 ratings)](https://appshunter.io/ios/app/the-mp3-experiment/id537991205/reviews) | **[4.5 (42 ratings)](https://appshunter.io/ios/app/4th-wall/id1325881248/reviews)** |
| Number of ratings | 12 | **42** |
| Positive reviews | **78.3% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 11 days** |
| Monetization | Free | Free |
| Size | 39 MB | 298 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Improv Everywhere Productions, Inc.](https://appshunter.io/developer/1141107519) | [Nancy Baker Cahill Studio, Inc](https://appshunter.io/developer/1600490816) |

## What reviewers say

### The Mp3 Experiment

[App page](https://appshunter.io/ios/app/the-mp3-experiment/id537991205)

This app synchronizes custom audio playback for participants in a live, participatory audio adventure. Users join an event, and the audio automatically plays in sync, guiding them through humorous, secret instructions in public spaces.

**Highlights:** Synchronized audio playback, Participatory audio adventures, Custom audio file synchronization, Automatic playback at event start, Live event guidance

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

**In-app purchases:** none


### 4th Wall

[App page](https://appshunter.io/ios/app/4th-wall/id1325881248)

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.

**Highlights:** 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

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

**In-app purchases:** none


## Frequently asked questions

### Is The Mp3 Experiment free?

The Mp3 Experiment is free to download, with no in-app purchases.

### Is 4th Wall free?

4th Wall is free to download, with no in-app purchases.

### Which has better reviews, The Mp3 Experiment or 4th Wall?

4th Wall is rated higher. The Mp3 Experiment averages 3.8 out of 5 from 12 ratings, while 4th Wall averages 4.5 from 42 ratings.

### Do The Mp3 Experiment or 4th Wall have ads?

Neither The Mp3 Experiment nor 4th Wall shows ads.

### Which is updated more often, The Mp3 Experiment or 4th Wall?

The Mp3 Experiment ships an update every 9 months, and 4th Wall every 11 days. Most recently, The Mp3 Experiment was updated on October 2, 2026 and 4th Wall on October 7, 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.*