# Adopt vs Earthtunes

The clearest difference is update cadence: Earthtunes at every 3 months against Adopt's every 40 months. Earthtunes also leads on ratings volume (7 vs 1) and iOS requirement (15.0 vs 17.5). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for Adopt against 5.0 for Earthtunes. That said, the two scores are not equally well evidenced: Earthtunes has 7 ratings behind it against 1, so its average is the more settled of the two.

Adopt ships an update every 40 months, Earthtunes every 3 months. The most recent releases landed on June 1, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Adopt | Earthtunes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/adopt-a-float/id1473875623/reviews) | [5.0 (7 ratings)](https://appshunter.io/ios/app/earthtunes/id1529159097/reviews) |
| Number of ratings | 1 | **7** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 1 MB | 20 MB |
| Requires iOS | 17.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Frederik Simons](https://appshunter.io/developer/1687712314) | [Northwestern University](https://appshunter.io/developer/348646676) |

## What reviewers say

### Adopt

[App page](https://appshunter.io/ios/app/adopt-a-float/id1473875623)

Access real-time data from autonomous oceanographic floats that record seismic activity. View instrument locations, trajectories, and health parameters. This app provides a low-cost method for oceanic data collection.

**Highlights:** View MERMAID instrument locations, Access recent trajectories, Obtain ocean depth information, View instrumental metadata, Identify instruments by name and institution

**Features:** macOS Compatibility

**In-app purchases:** none


### Earthtunes

[App page](https://appshunter.io/ios/app/earthtunes/id1529159097)

Explore the Earth's hidden sounds by amplifying low-frequency seismic waves. This app transforms inaudible geological vibrations into audible pitches, offering a unique auditory experience of our planet's inner workings. Discover the fascinating acoustic phenomena generated by environmental sources and seismic events.

**Highlights:** Listen to inaudible seismic waves, Amplify low-frequency sounds, Experience Earth's geological vibrations, Understand seismic wave origins, Fascinating auditory exploration

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

**In-app purchases:** none


## Frequently asked questions

### Is Adopt free?

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

### Is Earthtunes free?

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

### Which has better reviews, Adopt or Earthtunes?

Adopt and Earthtunes are both rated 5.0 out of 5 on the App Store, from 1 and 7 ratings respectively.

### Do Adopt or Earthtunes have ads?

Neither Adopt nor Earthtunes shows ads.

### Which is updated more often, Adopt or Earthtunes?

Adopt ships an update every 40 months, and Earthtunes every 3 months. Most recently, Adopt was updated on June 1, 2026 and Earthtunes on September 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.*