---
title: "Astrophysics I - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Astrophysics I is the first of a series of three educative applications in astronomy. This first part covers the solar system.  More than 90 screens of astronomy on the solar system !  More than 40 an"
---

# Astrophysics I — United States

![Astrophysics I App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/61/c4/db/61c4db5a-e27d-0074-5d0d-ba912fd57d34/AppIcon-0-0-1x_U007emarketing-0-8-0-sRGB-85-220.png/434x0w.png)

**Developer:** [Xavier Daxhelet](https://apptail.io/developer/xavier-daxhelet-HuM)
**Category:** Reference
**Rating:** 4.4/5 (9 ratings)
**Price:** $3.99
**Bundle ID:** com.kromasoft.astrophysicsI
**Store:** Apple App Store
**Country:** United States
**Version:** 5.1 (released 2026-04-28)
**Original Release:** 2011-07-27
**Languages:** English, French

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id449455262)
**AppTail Page:** [https://apptail.io/app/astrophysics-i-VAUe/united-states](https://apptail.io/app/astrophysics-i-VAUe/united-states)

## Astrophysics I Description
Astrophysics I is the first of a series of three educative applications in astronomy. This first part covers the solar system. 
More than 90 screens of astronomy on the solar system ! 
More than 40 animations to explain astrophysics, most in 3D. 

For teachers !! Connect your iPad to a video projector and show the animations to your students in classroom. 

List of topics:

Introduction:
- Reminder of mathematics,
- Reminder of mechanical,
- Coordinate Systems,
- Time measurement.

Gravity
- Gravity,
- The orbits,
- The orbit elements,
- Kepler's laws,
- The Lagrangian points.

The Solar System
- Earth,
- The Earth-Moon system,
- The Earth's atmosphere,
- Atmospheres,
- Distance Scale,
- Models of Solar Systems,
- Asteroids,
- Comets,
- The planets.

Constants
- Physical constants,
- Astronomical constants.

References
- Books,
- Websites.

## Astrophysics I Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/87/dd/1a/87dd1aea-7bc3-5c16-8a8c-e66aeebf273d/mzl.hsqrbyco.png/960x640.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/8f/10/00/8f1000fa-f828-246f-0fff-e6fad1c10f4f/mzl.vlavkvyy.png/960x640.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/f1/75/81/f17581ce-6252-d421-fd1d-b1158f4c8f51/mzl.xzqvcydy.png/640x960.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/04/5f/5a/045f5a9e-16fd-ab59-16ff-0656faf87cc5/mzl.cmwxwgxc.png/960x600.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/0f/66/5b/0f665b47-9123-58ca-d814-971feb95bbe0/mzl.lnpssomv.png/960x600.png)

## Astrophysics I Rating Breakdown in United States
- 5 stars: 7 (78%)
- 4 stars: 1 (11%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 1 (11%)

## Astrophysics I Reviews in United States

### ***** "Needs a better general information!"
This app is getting old. Could you make it better by adding more chapters and informations and animations?
-- hill673, 2024-07-14

### *---- "Astrophysics apps"
I am a science student at university, and I bought the set of these astrophysics apps and they do not work. I paid nearly 10 dollars for the both of them, and I can't do anything. I don't have a lot of money and I got this in return. The apps crash like crazy, particularly astrophysics II. I've never written a bad review in my life, until now. I'd love a refund for a complete waste of my money.
-- PhysicsGoddess2013, 2016-08-27

### *---- "Will not download"
This seems like a great app. I have the second one, but this one will not download so I wasted my money on an app that will not download. Please fix this!
-- vdbsfhfdbviufdeniujdfnbvb, 2015-12-25

### *---- "Not much information for the cost :("
Not much information for the cost :(
-- MsKrump, 2014-08-10

### *---- "Don't buy"
Poor school project
-- DDLDEF, 2014-02-06

### ***** "Tipping my hat"
Obviously high effort by this author.  Thanks, Xavier!
-- Sudhiro, 2013-06-23

### *---- "Don't upgrade"
With the new version very little actually works. Needs a serious fix or DO NOT update to the new version.
-- okbdc, 2013-06-12

### *---- "Probably zero editing!"
You'd expect that an app priced as such would have been edited appropriately.

Not impressed... DO NOT BUY THIS APP!
-- LookUpInAwe, 2013-04-13

### ***** "Fantastic!!!"
This app is absolutely amazing! I use it often and I'm in love with the detail put into it. Amazing job!
-- Ultimaxx9, 2012-08-05

### ***** "Amazing!"
This app is fantastic, maybe one of the best I own. I am a grad student in aerospace engineering and it has a lot of information for quick reminders and/or learning new stuff. The usefulness as a quick reference aside the animations and examples are fabulous. I would only suggest going though and finding the language errors. No glaring errors just a few terms that haven't gotten an alternate English term. Otherwise the amount of work put into this is exceedingly evident and I must give credit where credit is due. I own several of this developers apps and all are great. Keep it up and I look forward to more.
-- Phil112358, 2012-05-07

[View all Astrophysics I reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)


## Astrophysics I Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Lebanon | Reference | #128 |
| Top Paid | France | Reference | #150 |

## Astrophysics I Discovered Keywords
- astrophysics i

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---

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