# Exoplanet Explorer vs See H2O

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.

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.

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.

## The numbers

| Metric | Exoplanet Explorer | See H2O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (70 ratings)](https://appshunter.io/ios/app/exoplanet-explorer/id1457614833/reviews)** | — |
| Number of ratings | **70** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 53 months |
| Monetization | Freemium | — |
| Size | 171 MB | 235 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch, Vision Pro** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carsten Knoblich](https://appshunter.io/developer/541438854) | [byAR](https://appshunter.io/developer/1087402347) |

## What reviewers say

### Exoplanet Explorer

[App page](https://appshunter.io/ios/app/exoplanet-explorer/id1457614833)

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:** Family Sharing, Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 months subscription | $2.99 | per 3 months |
| 12 months subscription | $6.99 | per year |
| Big supporting tip | $2.99 | one-time |
| Really big supporting tip | $4.99 | one-time |


### See H2O

[App page](https://appshunter.io/ios/app/see-h2o/id1601675159)

**In-app purchases:** none


## Frequently asked 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.

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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.*