# Radio Pulsars vs GrappleCosmos

The clearest difference is price: GrappleCosmos at Free against Radio Pulsars's $0.99. GrappleCosmos also leads on update cadence (weekly vs every 8 months) and iOS requirement (13.0 vs 15.2). On ads, in-app purchases and device support there is nothing between them.

GrappleCosmos is free to download; Radio Pulsars costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Radio Pulsars ships an update every 8 months, GrappleCosmos weekly. The most recent releases landed on November 9, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Radio Pulsars | GrappleCosmos |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/radio-pulsars/id1638448107/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | Paid | — |
| Size | 3 MB | 24 MB |
| Requires iOS | 15.2 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [萌 于](https://appshunter.io/developer/1591520621) | [Alexander Gorer](https://appshunter.io/developer/1091950162) |

## What reviewers say

### Radio Pulsars

[App page](https://appshunter.io/ios/app/radio-pulsars/id1638448107)

Explore the universe of pulsars with this app, which turns your iPhone into a virtual radio telescope. Discover and observe 85 unique pulsars, including glitching ones and famous celestial objects, offering an engaging educational experience for astronomy enthusiasts.

**Highlights:** Virtual radio telescope simulation, Observe 85 unique pulsars, Learn about glitching pulsars, Explore iconic pulsar examples, Educational astronomy content, iPhone and iPod Touch compatible

**In-app purchases:** none


### GrappleCosmos

[App page](https://appshunter.io/ios/app/grapplecosmos-bjj-techniques/id6471621283)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Radio Pulsars free?

Radio Pulsars costs $0.99, with no in-app purchases.

### Is GrappleCosmos free?

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

### Do Radio Pulsars or GrappleCosmos have ads?

Neither Radio Pulsars nor GrappleCosmos shows ads.

### Which is updated more often, Radio Pulsars or GrappleCosmos?

Radio Pulsars ships an update every 8 months, and GrappleCosmos weekly. Most recently, Radio Pulsars was updated on November 9, 2026 and GrappleCosmos on October 30, 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.*