# CosmoCalc vs Space Telescope App

The clearest difference is review sentiment: CosmoCalc at 100% against Space Telescope App's 40%. CosmoCalc also leads on rating (5.0 vs 4.0) and in-app purchases (none vs 4). Space Telescope App's advantage is update cadence (every 10 days vs every 6 months) and ratings volume (30 vs 4). On price and device support there is nothing between them.

Both are free to download. Space Telescope App sells 4 in-app purchases, starting at $4.99 per month. CosmoCalc asks for nothing beyond the download.

CosmoCalc holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Space Telescope App has 30 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of CosmoCalc's written reviews are positive against 40% of Space Telescope App's.

CosmoCalc ships an update every 6 months, Space Telescope App every 10 days. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CosmoCalc | Space Telescope App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cosmocalc/id334569654/reviews)** | [4.0 (30 ratings)](https://appshunter.io/ios/app/space-telescope-app/id1603876992/reviews) |
| Number of ratings | 4 | **30** |
| Positive reviews | **100.0% of reviews** | 40.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 104 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Eli Rykoff](https://appshunter.io/developer/318275933) | [KAKHA GIORGASHVILI](https://appshunter.io/developer/1501353984) |

## What reviewers say

### CosmoCalc

[App page](https://appshunter.io/ios/app/cosmocalc/id334569654)

This app calculates astronomical distances and scales based on user-selected cosmological parameters. It offers a simple interface for astronomers, students, and enthusiasts to quickly determine various cosmic measurements.

**Highlights:** Select cosmological parameters (H0, Ωm, ΩΛ), Choose from common reference cosmologies, Calculate luminosity distance, Determine angular diameter distance, Calculate lookback time, Find age of the Universe, Compute comoving volume and critical density

**Features:** macOS Compatibility

**In-app purchases:** none


### Space Telescope App

[App page](https://appshunter.io/ios/app/space-telescope-app/id1603876992)

Explore the universe with real-time updates and stunning visuals from NASA's James Webb Space Telescope. Engage with expert insights, join community discussions, and test your knowledge with interactive quizzes. Discover distant galaxies and unlock the secrets of the early universe.

**Highlights:** Live mission updates, Breathtaking image gallery, Expert Q&A with astronomers, Community discussions, Interactive space quizzes, 3D solar system explorer, Exclusive wallpapers

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Ad-Free Plan | $4.99 | per month |
| Ad-Free Annual Access | $29.99 | per year |
| Premium | $2.99 | one-time |
| Buy 1M Points | $99.99 | one-time |


## Frequently asked questions

### Is CosmoCalc free?

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

### Is Space Telescope App free?

Space Telescope App is free to download, with in-app purchases available.

### Which has better reviews, CosmoCalc or Space Telescope App?

CosmoCalc is rated higher. CosmoCalc averages 5.0 out of 5 from 4 ratings, while Space Telescope App averages 4.0 from 30 ratings.

### Do CosmoCalc or Space Telescope App have ads?

Space Telescope App shows ads; CosmoCalc does not.

### Which is updated more often, CosmoCalc or Space Telescope App?

CosmoCalc ships an update every 6 months, and Space Telescope App every 10 days. Most recently, CosmoCalc was updated on October 6, 2026 and Space Telescope App on October 7, 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.*