Adopt vs Sparka
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- View MERMAID instrument locations
- Access recent trajectories
- Obtain ocean depth information
- View instrumental metadata
- Identify instruments by name and institution
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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.
Sparka
Master AI prompting to achieve expert-level results from AI tools. This app guides you through creating specific prompts by answering a few questions, helping you understand what makes prompts effective and build a library of your best work.
- Master AI prompt creation
- Get expert-level AI results
- Turn vague requests into specific prompts
- Learn why prompt changes matter
- Save and reuse prompts
- Built by certified prompt engineers
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Stop Getting Generic AI Answers. Unlock expert-level results, every time. AI is powerful, but your results shouldn’t be random. Sparka helps you master prompts so you always get the output you need. Get Better Results Fast Turn vague requests into powerful, specific prompts. Just answer 3 quick questions and watch your score soar. Learn What Works See why changes matter so you can prompt like a pro in ChatGPT, Claude, or any AI tool. Build Your Prompt Arsenal Save and reuse your best work so you never start from scratch. For professionals and creators who want AI that delivers every time. Built by certified prompt engineers. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Adopt at none against Sparka's 2. Sparka's advantage is update cadence (every 2 weeks vs every 40 months). On price, rating, review sentiment and ratings volume 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. Sparka sells 2 in-app purchases, starting at $2.99 per 7 days. Adopt asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Adopt against 5.0 for Sparka. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Adopt ships an update every 40 months, Sparka every 2 weeks. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.
| Parameter | Adopt | Sparka |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 40 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.5 — better | 18.2 |
| Further details — not scored | ||
| Size | 1 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederik Simons | Connor Hammond |
Customer experience
Adopt
Sparka
In-app purchases
Adopt
No in-app purchases
Sparka
- Sparka Pro - Weekly$2.997 Days
- Sparka Pro - Annual$99.991 Year









