# Star Pupil vs RadarPlot

The clearest difference is in-app purchases: Star Pupil at none against RadarPlot's 1. Star Pupil also leads on update cadence (every 5 days vs every 4 months) and iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. RadarPlot sells 1 one-off in-app purchase. Star Pupil asks for nothing beyond the download.

Star Pupil ships an update every 5 days, RadarPlot every 4 months. The most recent releases landed on September 24, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Star Pupil | RadarPlot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/star-pupil/id6463496579/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 4 months |
| Monetization | Free | — |
| Size | 15 MB | 58 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Richard Craddock](https://appshunter.io/developer/1579756955) | [Paulina Praciak](https://appshunter.io/developer/1869727950) |

## What reviewers say

### Star Pupil

[App page](https://appshunter.io/ios/app/star-pupil/id6463496579)

This app helps you practice celestial navigation by showing every step of sight reductions and plotting lines of position. It covers calculations for the Sun, planets, and stars using standard nautical publications.

**Highlights:** Step-by-step sight reductions, Plotting Lines of Position (LOPs), Calculations for Sun, Planets, Stars, Uses Pub 229 and Pub 249, Twilight calculations, Star selection assistance

**Features:** macOS Compatibility

**In-app purchases:** none


### RadarPlot

[App page](https://appshunter.io/ios/app/radarplot-radar-plot-trainer/id6757932413)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $14.99 | one-time |


## Frequently asked questions

### Is Star Pupil free?

Star Pupil is free to download, with no in-app purchases.

### Is RadarPlot free?

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

### Do Star Pupil or RadarPlot have ads?

Neither Star Pupil nor RadarPlot shows ads.

### Which is updated more often, Star Pupil or RadarPlot?

Star Pupil ships an update every 5 days, and RadarPlot every 4 months. Most recently, Star Pupil was updated on September 24, 2026 and RadarPlot on October 5, 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.*