Universe Size Comparison vs Nautical Signal Code Flags
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Universe Size Comparison
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.
- 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
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Universe Size Comparison is a unique 3D astronomical app that will make you understand the real dimensions of the universe and how small we are. Have you ever wondered how big the Sun is compared to Earth? Or what is the largest planet between Mars and Earth? Do you want to find out the dimensions of some of the most famous stars in the sky like Rigel and Betelgeuse in comparison to our Sun? Do you want to compare everything with the hypergiant star VY Canis Majoris? Universe Size Comparison is the right app for you. The app offers two modes: Tour Mode and Free Mode. Tour mode will guide you on a spectacular journey where you will see planets and stars compared in full scale. All accompanied by simple and clear explanations regardless of the level of knowledge of the subject. The Free mode will allow you to compare two celestial bodies of your choice in scale. You will also find out more information on the bodies you are comparing thanks to an elegant user interface designed to offer the maximum user experience.
Nautical Signal Code Flags
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Use this beautifully designed app to introduce the use of Nautical Signal Code Flags to send messages. The app presents all the letters of the English alphabet as well as the numbers from zero to ten. The Nautical Signal Code Flags Toolkit is an interactive learning tool for introducing the way that flags are used on ships and boats to send information. In the exploration mode users can press any key and see the flag that is associated with selected letter. Using the keyboard students can see how to spell a word using signal flags. Switch to the number mode to learn how to signal numbers from zero to ten. Press any key in this mode and see how to signal the number. Students who are learning how to use nautifcal signal code flags will find the quiz feature helpful. After pressing the question mark to start the quiz, a word is randomly selected from a specific word list. The way to spell the word using signal flags is shown. The object is for the student to recognize a flag for a letter in a word and to type the corresponding letter on the keyboard. Speech effects are provided so that when a letter is pressed on the keyboard it is pronounced aloud. This feature can optionally be turned on or off. Nautical flags are a system of colorful flags used primarily for communication at sea. Each flag has a specific meaning, often representing letters of the alphabet, numbers, or specific messages like distress signals or navigational instructions. These flags are crucial for ensuring safe and effective communication between vessels, especially when radio silence is required or in situations where radio communication is not possible. The International Code of Signals, established in the mid-19th century, standardizes the meanings of these flags, allowing for consistent and clear exchanges of information among ships worldwide.
Screenshots
Verdict
The clearest difference is update cadence: Universe Size Comparison at every 4 months against Nautical Signal Code Flags's every 30 months. Nautical Signal Code Flags's advantage is iOS requirement (13.2 vs 17.0). On price, ads, in-app purchases and device support 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
Universe Size Comparison costs $1.99 and Nautical Signal Code Flags $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Universe Size Comparison ships an update every 4 months, Nautical Signal Code Flags every 30 months. The most recent releases landed on October 9, 2026 and October 16, 2026 respectively.
| Parameter | Universe Size Comparison | Nautical Signal Code Flags |
|---|---|---|
| Price | $1.99 | $1.99 |
| Rating | 3.1 (29 ratings) — better | — |
| Positive reviews | 70.0% of reviews | — |
| Number of ratings | 29 — better | — |
| Update frequency | Every 4 months — better | Every 30 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, Apple TV — better | iPad, Apple TV |
| Requires iOS | 17.0 | 13.2 — better |
| Further details — not scored | ||
| Size | 413 MB | 10 MB |
| Age rating | +4 | 4+ |
| Developer | Daniele Citi | Ventura Educational Systems |
In-app purchases
Universe Size Comparison
No in-app purchases
Nautical Signal Code Flags
No in-app purchases
Questions
Is Universe Size Comparison free?
Is Nautical Signal Code Flags free?
Do Universe Size Comparison or Nautical Signal Code Flags have ads?
Which is updated more often, Universe Size Comparison or Nautical Signal Code Flags?
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