# Astrophysics I — user reviews

> 33 indexed App Store user reviews of Astrophysics I by Xavier Daxhelet, rated 4.40/5 from 9 ratings.

- Source: https://appshunter.io/ios/app/astrophysics-i/id449455262/reviews
- App overview in markdown: https://appshunter.io/ios/app/astrophysics-i/id449455262.md
- Rating breakdown: 5★ 7 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 1

## Newest reviews (10 of 33)

### 3/5 — Textes illisibles, blanc sur fond jaune

*2026-04-15*

Depuis la dernière mise à jour illisible sur l’application 1 et 2 idem.
Merci !

### 4/5 — Very good!

*2013-07-06, version 2.0.1*

Good use of visuals, especially the animations to reinforce the text.  Would be nice to have more detail behind he various theories and a method of simplifying some of the mathematic equations.  But really enjoyed it.

### 4/5 — Retour aux études

*2013-03-15*

Avec des animations qui permettent d' éclairer un peu ces notions difficiles et donnent envie d' aller plus loin dans leur compréhension .
Pour le moment sur mon IPhone 4 quelques animations ne marchent pas et font planter l' application.

### 3/5 — Dense mais aride.

*2012-12-29*

Interface austère, concentré d'informations, on dirait un résumé de cours pour réviser ; formules, définitions, ...
Décevant, donc cher.

### 2/5 — Déçus

*2012-09-05*

Plante sans arrêt

### 4/5 — Great app...

*2012-05-30*

...but several typos and spelling mistakes.

### 5/5 — Amazing!

*2012-05-07*

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.

### 3/5 — Review

*2012-04-12*

This app is ok but its focus on mathematics and physics lacks greatly and is basically an overview of and the history of astronomy, not astrophysics

### 5/5 — Gfbkjbkhgvvkhgvhkvkvkghvhkvhgvhkgkugvkghgvkghvkygvykg

*2012-01-25, version 1.3.3*

It is very cool

### 1/5 — Décevant

*2011-12-27, version 1.3.2*

Du déjà vu , n'explique pas grand chose de plus de ce qu'on connaît......déjà.
Ne vaut pas le prix demande.

## Most critical reviews (10 lowest-rated)

### 1/5 — Astrophysics apps

*2016-08-27*

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.

### 1/5 — Bug quasi total

*2016-06-06*

Bonjour, je viens d'acheter cette app qui est vraiment bonne et complète. Mais!: plantage complet! Presque toutes les animations, animations 3D et informations ne s'ouvrent pas! Dommage car elle est vraiment très bien. Je le sais parce que j'ai réussi à la voir entièrement une seule fois. Depuis plus rien! Et j'essaye plusieurs fois par jour. Veuillez donc s'il vous plaît corriger et remédier à ce gros Bug au plus vite ou alors remboursez. J'aimerais également acheter astrophysique n°2 mais j'attend la réparation de ce n°1. Merci d'avance. Cordialement.

### 1/5 — Bug sur les animations

*2016-05-17*

Impossible de joindre le concepteur  sur le bug des animations merci de rembourser l application

### 1/5 — Another waste of money

*2016-04-12, version 3.2*

While I was able to download this app, tapping on any animation/graphic link freezes the app.

### 1/5 — Will not download

*2015-12-25*

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!

### 1/5 — Not much information for the cost :(

*2014-08-10*

Not much information for the cost :(

### 1/5 — Don't buy

*2014-02-06*

Poor school project

### 1/5 — Don't upgrade

*2013-06-12*

With the new version very little actually works. Needs a serious fix or DO NOT update to the new version.

### 1/5 — Probably zero editing!

*2013-04-13*

You'd expect that an app priced as such would have been edited appropriately.

Not impressed... DO NOT BUY THIS APP!

### 1/5 — How can you charge money

*2012-06-11*

for copy-pasting a few formulas?!

## Most praised reviews (10 highest-rated)

### 5/5 — Excellente application comme peu

*2026-07-11*

Indispensable

**Developer response:** Ce problème a été résolu avec la version 5.1.

### 5/5 — Bonne Astronomie

*2026-04-24*

Données intéressantes…

### 5/5 — Needs a better general information!

*2024-07-14*

This app is getting old. Could you make it better by adding more chapters and informations and animations?

### 5/5 — excellent

*2016-09-03*

excellente application que je recommande à tous.

### 5/5 — Astrophysique 1

*2015-08-21*

Parfait pour le néophyte et le spécialiste. Animations prodigieuses

### 5/5 — Tipping my hat

*2013-06-23*

Obviously high effort by this author.  Thanks, Xavier!

### 5/5 — Génial !!!

*2012-12-20*

Effectivement il faut du niveau!!!

En ce qui me concerne j'aimerai bien des exercices ... Monsieur le créateur si vous m'entendez  ;)

### 5/5 — Superbe!

*2012-12-11, version 1.9*

Un parfait mélange entre l'abstrait et le concret. Les possibilités de l'iPad conviennent parfaitement à cette application et la rendent fort attrayante. Une façon conviviale de voir ou revoir les notions.  Bravo!

### 5/5 — Génial

*2012-12-03*

J'avais déjà rédigé un avis très favorable pour cet excellent logiciel, aussi bien fait que très documenté, et je ne le vois pas. 

Mes avis disparaissent-ils au fur et à mesure que je les rédige?

### 5/5 — Fantastic!!!

*2012-08-05*

This app is absolutely amazing! I use it often and I'm in love with the detail put into it. Amazing job!

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-19.*