# Astrophysics II vs OSHA Reference

The clearest difference is price: OSHA Reference at Free against Astrophysics II's $2.99. OSHA Reference also leads on rating (5.0 vs 4.3) and update cadence (every 4 days vs every 5 months). Astrophysics II's advantage is in-app purchases (none vs 1) and ratings volume (6 vs 1). On ads, device support and iOS requirement there is nothing between them.

OSHA Reference is free to download; Astrophysics II costs $2.99 up front. OSHA Reference sells 1 one-off in-app purchase. Astrophysics II asks for nothing beyond the download.

OSHA Reference holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Astrophysics II has 6 ratings behind it against 1, so its average is the more settled of the two.

Astrophysics II ships an update every 5 months, OSHA Reference every 4 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Astrophysics II | OSHA Reference |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/astrophysics-ii/id525011116/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/osha-reference/id6760950424/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 days** |
| Monetization | Paid | **Free** |
| Size | 68 MB | 51 MB |
| Requires iOS | 18.6 | **18.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Xavier Daxhelet](https://appshunter.io/developer/339056993) | [ZIma Logistics LLC](https://appshunter.io/developer/1883563240) |

## What reviewers say

### Astrophysics II

[App page](https://appshunter.io/ios/app/astrophysics-ii/id525011116)

Explore the fascinating world of stars with this educational application. It features over 60 screens of astronomical content, including detailed explanations and 3D animations. Ideal for teachers to use in classrooms, it covers topics from light and matter to stellar evolution and black holes.

**Highlights:** Covers stars and stellar evolution, Over 60 screens of content, More than 25 3D animations, Classroom projection features, Detailed topics on light and matter, Information on stellar systems, Includes physical and astronomical constants

**Features:** macOS Compatibility

**In-app purchases:** none


### OSHA Reference

[App page](https://appshunter.io/ios/app/osha-reference/id6760950424)

Access and search federal workplace safety regulations offline. Includes tools for classifying workplace incidents and calculating heat stress with OSHA-aligned guidance. Bookmark important standards for quick access.

**Highlights:** Browse all OSHA regulations, Full-text search of standards, Incident classification wizard, Heat stress calculator, Offline access, Bookmark regulations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OSHA Reference Pro | $6.99 | one-time |


## Frequently asked questions

### Is Astrophysics II free?

Astrophysics II costs $2.99, with no in-app purchases.

### Is OSHA Reference free?

OSHA Reference is free to download, with in-app purchases available.

### Which has better reviews, Astrophysics II or OSHA Reference?

OSHA Reference is rated higher. Astrophysics II averages 4.3 out of 5 from 6 ratings, while OSHA Reference averages 5.0 from 1 ratings.

### Do Astrophysics II or OSHA Reference have ads?

Neither Astrophysics II nor OSHA Reference shows ads.

### Which is updated more often, Astrophysics II or OSHA Reference?

Astrophysics II ships an update every 5 months, and OSHA Reference every 4 days. Most recently, Astrophysics II was updated on October 13, 2026 and OSHA Reference on October 12, 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.*