# Plen vs AstroPup Sky

The clearest difference is iOS requirement: Plen at 17.0 against AstroPup Sky's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Plen ships an update every 6 days, AstroPup Sky weekly. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Plen | AstroPup Sky |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/astropup-sky/id6764730162/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Weekly |
| Monetization | Free | Free |
| Size | 203 MB | 25 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Automata Solutions Ltd.](https://appshunter.io/developer/1520244123) | [Aaron Freimark](https://appshunter.io/developer/1533614349) |

## What reviewers say

### Plen

[App page](https://appshunter.io/ios/app/plen/id6504163423)

Track aircraft in real-time with live location updates. See planes as they fly and monitor weather conditions along their routes. Discover various types of aircraft with this intuitive radar tool.

**Highlights:** Real-time ADS-B tracking, Live aircraft location updates, Weather updates for flight paths, Discover different types of aircraft, Intuitive radar interface

**Features:** macOS Compatibility

**In-app purchases:** none


### AstroPup Sky

[App page](https://appshunter.io/ios/app/astropup-sky/id6764730162)

This application provides a unique sky chart for astrophotographers, displaying celestial object visibility for an entire night. It allows users to personalize their view with custom horizons and receive clear-sky notifications for preferred observing locations.

**Highlights:** All-sky, all-night object visibility, Object rise and set times, Personalized horizon views, Clear-sky notifications, Supports custom horizon files

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

**In-app purchases:** none


## Frequently asked questions

### Is Plen free?

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

### Is AstroPup Sky free?

AstroPup Sky is free to download, with no in-app purchases.

### Do Plen or AstroPup Sky have ads?

Neither Plen nor AstroPup Sky shows ads.

### Which is updated more often, Plen or AstroPup Sky?

Plen ships an update every 6 days, and AstroPup Sky weekly. Most recently, Plen was updated on October 20, 2026 and AstroPup Sky on October 24, 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.*