Comparison

Earth's Core vs Adopt

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Earth's Core

Explore the internal structure of our planet with a detailed view of Earth's layers. Discover the composition, temperature, and depth of each section, from the crust to the core. This educational tool provides a fascinating look beneath your feet.

Highlights
  • Visualize Earth's internal structure
  • Explore planet layers
  • Discover layer temperatures
  • Learn layer depths
  • Detailed look inside the planet
Features
Read full description

The Earth's Core App lets you see our planet’s internal structure. Just point your mobile to the center of the Earth and experience a deep look inside our planet. Right beneath your feet, thousands of kilometers deep, lies a giant ball of molten Iron as hot as the surface of the sun! Explore the Layers of the Earth and their names, discover the temperature and depth of each layer. Feedback and ideas: please send to support@cosmic-watch.com

About

Adopt

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
Read full description

Adopt-A-Float allows users to access trajectory metadata and state-of-health parameters of the EarthScope-Oceans MERMAID fleet. MERMAID, short for Mobile Earthquake Recording in Marine Areas by Independent Divers, is a long-lived drifting autonomous float equipped with a hydrophone capable of recording acoustic waveforms generated by distant earthquakes. Most earthquakes occur at or near plate boundaries, yet most seismic monitoring stations are on dry land. Deployed but not recovered, telemetering data in near-real-time, MERMAIDs are uniquely positioned as a low-cost alternative for geophysical and environmental oceanic data collection. Diving down to a typical parking depth of 1500 m below the ocean surface, they passively drift with the ocean currents, recording the ambient acoustic wavefield, identifying earthquake signals, and surfacing to report those, on average every 4-7 days with the current settings, which are expected to give them a five-year life span. When at the surface, MERMAID collects GPS location and time information and communicates with the IRIDIUM satellite constellation using RUDICS. Using this iOS app you can: View the current location of all MERMAID instruments View their most recent trajectories and obtain information about ocean depth View instrumental metadata such as battery level and instrument pressure readings Identify the instruments by name and by operating institution Developed by Tenzing Sherpa ©2021 by Frederik J Simons (www.frederik.net) Let us know what you think! Give us feedback via https://github.com/tenzingsherpaa/AdoptAFloat-3.0/issues We acknowledge support from the U.S. National Science Foundation (www.nsf.org) under grants OCE-1917058 and EAR-1150145 (CAREER), and from Princeton University. MERMAID was designed by scientists and engineers and is now built by OSEAN SAS (www.osean.fr), from which it is commercially available. EarthScope-Oceans (www.earthscopeoceans.org) is an organization founded by a multidisciplinary group of geoscientists who are coordinating efforts to create a global network of sensors that monitor the Earth from within the oceanic environment. As other organizations are doing for the land-based seismological communities today, EarthScope-Oceans shepherds national projects into the international arena where globally relevant, applicable, and mutually agreed-upon decisions can be made on instrument development, science objectives, data management, and outreach.

Screenshots

Earth's Core3 screens
Adopt3 screens

Verdict

The call

The clearest difference is rating: Adopt at 5.0 against Earth's Core's 4.3. Earth's Core's advantage is ratings volume (4 vs 1) and iOS requirement (12.0 vs 17.5). On price, review sentiment, update cadence and ads 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Adopt holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Earth's Core ships an update every 70 months, Adopt every 40 months. The most recent releases landed on August 31, 2026 and June 1, 2026 respectively.

Scorecard3 real differences · 7 level
Earth's Core versus Adopt: the parameters behind the verdict, then further details
ParameterEarth's CoreAdopt
PriceFreeFree
Rating4.3 (4 ratings)5.0 (1 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings4 — better1
Update frequencyEvery 70 monthsEvery 40 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.5
Further details — not scored
Size54 MB1 MB
Age rating4+4+
DeveloperCelestial Dynamics AGFrederik Simons

Customer experience

Earth's Core

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Adopt

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Earth's Core

No in-app purchases

None

Adopt

No in-app purchases

Questions

Is Earth's Core free?
Earth's Core is free to download, with no in-app purchases.
Is Adopt free?
Adopt is free to download, with no in-app purchases.
Which has better reviews, Earth's Core or Adopt?
Adopt is rated higher. Earth's Core averages 4.3 out of 5 from 4 ratings, while Adopt averages 5.0 from 1 ratings.
Do Earth's Core or Adopt have ads?
Neither Earth's Core nor Adopt shows ads.
Which is updated more often, Earth's Core or Adopt?
Earth's Core ships an update every 70 months, and Adopt every 40 months. Most recently, Earth's Core was updated on August 31, 2026 and Adopt on June 1, 2026.

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