Radio Pulsars vs GrappleCosmos
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Radio Pulsars
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.
- Virtual radio telescope simulation
- Observe 85 unique pulsars
- Learn about glitching pulsars
- Explore iconic pulsar examples
- Educational astronomy content
- iPhone and iPod Touch compatible
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Embark on a celestial journey with Radio Pulsars, an app that transforms your iPhone into a virtual radio telescope for experiencing the captivating world of pulsar astronomy. Pulsars, fascinating remnants of massive stars, are rapidly spinning neutron stars exhibiting incredibly precise periods. Acting as cosmic ‘lighthouses’, pulsars emanate beams of electromagnetic radiation due to ultra-high magnetic fields at their poles. In Radio Pulsars, you’ll dive into authentic pulsar observations, understanding the complexities of these astronomical phenomena. Pulsars, with their distinct pulse profiles, are like fingerprints of the universe. The app showcases 85 pulsars, including 26 glitching ones, providing a diverse collection of cosmic wonders. Explore iconic pulsars like PSR J1921+2153, the first detected in 1967, PSR J0534+2200 located in the Crab Nebula, and PSR J0835-4510, the brightest known pulsar. Witness the stability of PSR J0437-4715 and the uniqueness of PSR J0332+5434, the brightest pulsar in the northern sky. Marvel at the extraordinary double pulsar system, PSR J0737-3039, and the pulsar-neutron star duo, PSR J1915+1606. Radio Pulsars offers a comprehensive exploration for these cosmic marvels, providing an engaging and educational experience for astronomy enthusiasts. Immerse yourself in the captivating world of pulsar observation and unravel the secrets of the universe! Please note Radio Pulsars now only supports iPhone and does not support iPad.
GrappleCosmos
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Introducing GrappleCosmos App: Your BJJ Technique Video Summarizer! Elevate your Brazilian Jiu-Jitsu (BJJ) skills with GrappleCosmos, the innovative app designed to be your digital coach for BJJ excellence. Transform your training, competition strategies, and victory approach with our comprehensive tool. Weekly Technique Updates Gain a competitive edge with weekly content updates, featuring the newest and most effective BJJ techniques sourced from the best on Instagram and YouTube. Our ever-expanding library ensures your BJJ repertoire is constantly advancing. Exclusive Technique Summaries Streamline your learning with our exclusive summaries of intricate BJJ techniques. GrappleCosmos distills hours of video content into essential, digestible summaries, making complex moves easy to understand and apply. Advanced Technique Search Effortlessly sift through thousands of techniques with our sophisticated search feature. Quickly locate the exact move you need to enhance your game, saving time and boosting your learning process. Progress Tracking Keep an eye on your development with our integrated progress tracker. Review your summary notes and identify which techniques have most significantly benefited your BJJ journey. Mobile Learning Maximize downtime and turn it into productive learning with GrappleCosmos, your on-the-go BJJ companion. Keep your BJJ knowledge sharp anytime, anywhere. Community Engagement Connect with a vibrant community of BJJ practitioners. Exchange insights, tips, and favorite techniques with like-minded enthusiasts. Portable BJJ Library Embark on your path to BJJ mastery with GrappleCosmos right in your pocket. Experience the difference today and witness the tangible impact on your performance. Download GrappleCosmos now and revolutionize your grappling skills with the strategic edge of video summarization!
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Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Radio Pulsars | GrappleCosmos |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 2.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 8 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.2 | 13.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 24 MB |
| Age rating | 4+ | 17+ |
| Developer | 萌 于 | Alexander Gorer |
In-app purchases
Radio Pulsars
No in-app purchases
GrappleCosmos
No in-app purchases
Questions
Is Radio Pulsars free?
Is GrappleCosmos free?
Do Radio Pulsars or GrappleCosmos have ads?
Which is updated more often, Radio Pulsars or GrappleCosmos?
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