Comparison

Exoplanet Explorer vs See H2O

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

Head to head
About

Exoplanet Explorer

Explore a vast catalog of over 6,000 confirmed exoplanets with detailed scientific data. Compare worlds, visualize habitable zones, and track new discoveries. Ideal for stargazers, students, educators, and researchers.

Highlights
  • 6,000+ confirmed exoplanets
  • Detailed scientific data
  • Advanced filtering and sorting
  • Planet comparison tool
  • Habitable zone analysis
  • Home screen widgets
  • Apple Watch companion app
Features
Read full description

Explore the universe of exoplanets — over 6,000 confirmed worlds orbiting distant stars, updated from leading scientific archives. Track new discoveries as they happen and dive into the data behind every planet. EXPLORE THE COSMOS Search, filter, and sort the complete catalogue of confirmed exoplanets. Find planets by discovery method, star type, orbital characteristics, or habitability potential. Every entry includes detailed scientific data from peer-reviewed sources. ATMOSPHERIC SPECTRA Browse JWST and Hubble transmission spectra for planets where atmospheric data is available. Toggle molecular overlays for CO2, CH4, H2O, CO and more to see which absorption features have been detected. 3D SYSTEM VIEW Step into a planetary system in 3D — see each planet's orbit around its host star with realistic shading and a visualisation of the habitable zone. On iPhone and iPad you can also place a system into your environment in AR. COMPARE WORLDS Analyze exoplanets side-by-side — or compare them with Solar System planets like Earth, Jupiter, and Mars. Compare sizes, masses, orbital periods, star properties, and habitability scores to understand what makes each world unique. HABITABLE ZONE VISUALIZATION See exactly where planets orbit within their star's habitable zone — the region where liquid water could exist. Identify potentially Earth-like worlds and understand the conditions for life beyond our solar system. FEATURES • 6,000+ confirmed exoplanets with detailed scientific data • Atmospheric spectra with molecular overlays • 3D system view with AR mode • Advanced filtering and sorting • Planet comparison tool with Solar System reference • Habitable zone analysis • Spotlight search with deep linking • Home screen widgets • Apple Watch companion app • Bookmark favorites with iCloud sync • Available on iPhone, iPad, Mac, Apple Watch, and Apple Vision Pro GO PREMIUM Enjoying the app? Premium takes it further — unlimited bookmarks, the full planet comparison tool, and additional widgets. A small yearly upgrade that makes a big difference. Whether you're a curious stargazer, student, educator, or researcher, Exoplanet Explorer puts the cosmos in your pocket. Terms of Use (EULA): https://the-exoplanets.space/eula/ Privacy Policy: https://the-exoplanets.space/privacy/

About

See H2O

Read full description

“Um Novo Olhar Sobre A Água” é uma exposição do Centro de Educação Ambiental de Loures. Esta App permite acederes a conteúdos animados que vão ajudar à interpretação da exposição.

Screenshots

Exoplanet Explorer4 screens
See H2O4 screens

Verdict

The call

The clearest difference is in-app purchases: See H2O at none against Exoplanet Explorer's 4. See H2O also leads on iOS requirement (16.0 vs 18.0). Exoplanet Explorer's advantage is update cadence (every 2 weeks vs every 53 months) and device support (5 vs 3). On price 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. Exoplanet Explorer sells 4 in-app purchases, starting at $2.99 per 3 months. See H2O asks for nothing beyond the download.

UpkeepUpdate frequency

Exoplanet Explorer ships an update every 2 weeks, See H2O every 53 months. The most recent releases landed on October 25, 2026 and September 28, 2026 respectively.

Scorecard4 real differences · 6 level
Exoplanet Explorer versus See H2O: the parameters behind the verdict, then further details
ParameterExoplanet ExplorerSee H2O
PriceFreeFree
Rating4.6 (70 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings70 — better—
Update frequencyEvery 2 weeks — betterEvery 53 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, Mac, Apple Watch, Vision Pro — betteriPhone, iPad, iPod
Requires iOS18.016.0 — better
Further details — not scored
Size171 MB235 MB
Age rating4+4+
DeveloperCarsten KnoblichbyAR

In-app purchases

4 purchases

Exoplanet Explorer

Subscriptions2
  • 3 months subscription7 Days trial$2.993 Months
  • 12 months subscription7 Days trial$6.991 Year
One-time2
  • Big supporting tip$2.99
  • Really big supporting tip$4.99
None

See H2O

No in-app purchases

Questions

Is Exoplanet Explorer free?
Exoplanet Explorer is free to download, with in-app purchases available.
Is See H2O free?
See H2O is free to download, with no in-app purchases.
Do Exoplanet Explorer or See H2O have ads?
Neither Exoplanet Explorer nor See H2O shows ads.
Which is updated more often, Exoplanet Explorer or See H2O?
Exoplanet Explorer ships an update every 2 weeks, and See H2O every 53 months. Most recently, Exoplanet Explorer was updated on October 25, 2026 and See H2O on September 28, 2026.

Other comparisons