# CMB Maps vs Universe Size Comparison

The clearest difference is price: CMB Maps at Free against Universe Size Comparison's $1.99. CMB Maps also leads on rating (3.9 vs 3.2) and iOS requirement (6.0 vs 17.0). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

CMB Maps is free to download; Universe Size Comparison costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CMB Maps holds the better App Store score, 3.9 against 3.2. Both are backed by a comparable volume of ratings — 21 and 30 respectively. Written reviews complicate that: 67% of CMB Maps's written reviews are positive against 70% of Universe Size Comparison's, so the app with the better star average is not the one people write more warmly about.

## The numbers

| Metric | CMB Maps | Universe Size Comparison |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.9 (21 ratings)](https://appshunter.io/ios/app/cmb-maps/id894952449/reviews)** | [3.2 (30 ratings)](https://appshunter.io/ios/app/universe-size-comparison/id1473946290/reviews) |
| Number of ratings | 21 | **30** |
| Positive reviews | 66.7% of reviews | **70.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Monetization | **Free** | Paid |
| Size | 57 MB | 411 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple TV |
| Age rating | 4+ | +4 |
| Developer | [Qingqing Mao](https://appshunter.io/developer/894952452) | [Daniele Citi](https://appshunter.io/developer/1187632258) |

## What reviewers say

### CMB Maps

[App page](https://appshunter.io/ios/app/cmb-maps/id894952449)

Explore detailed all-sky maps of cosmic microwave background radiation from the Big Bang. Compare different generations of fluctuations in high resolution and view galactic coordinates and microwave sources.

**Highlights:** 4K resolution CMB maps, Compare multiple maps, Zoom and scroll for details, Sky reference map, Educational demonstration tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Universe Size Comparison

[App page](https://appshunter.io/ios/app/universe-size-comparison/id1473946290)

Explore the vastness of space and understand celestial body dimensions through interactive 3D comparisons. Discover the scale of planets and stars, from our Sun to hypergiant stars, with guided tours and free comparison modes.

**Highlights:** 3D astronomical comparisons, Tour Mode with guided explanations, Free Mode for custom comparisons, Scale comparisons of planets and stars, Detailed celestial body information, Elegant user interface

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

**In-app purchases:** none


## Frequently asked questions

### Is CMB Maps free?

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

### Is Universe Size Comparison free?

Universe Size Comparison costs $1.99, with no in-app purchases.

### Which has better reviews, CMB Maps or Universe Size Comparison?

CMB Maps is rated higher. CMB Maps averages 3.9 out of 5 from 21 ratings, while Universe Size Comparison averages 3.2 from 30 ratings.

### Do CMB Maps or Universe Size Comparison have ads?

Neither CMB Maps nor Universe Size Comparison shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*