# Gravitational Wave Events vs Ninja Learning

The clearest difference is update cadence: Ninja Learning at every 5 days against Gravitational Wave Events's monthly. Ninja Learning also leads on rating (5.0 vs 4.8). Gravitational Wave Events's advantage is ratings volume (133 vs 5). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Ninja Learning holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Gravitational Wave Events has 133 ratings behind it against 5, so its average is the more settled of the two.

Gravitational Wave Events ships an update monthly, Ninja Learning every 5 days. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Gravitational Wave Events | Ninja Learning |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (133 ratings)](https://appshunter.io/ios/app/gravitational-wave-events/id1441897107/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ninja-learning/id6781386191/reviews)** |
| Number of ratings | **133** | 5 |
| Positive reviews | 89.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Free | Free |
| Size | 7 MB | 36 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Peter Kramer](https://appshunter.io/developer/348619994) | [Shubh Vashisht](https://appshunter.io/developer/6781386193) |

## What reviewers say

### Gravitational Wave Events

[App page](https://appshunter.io/ios/app/gravitational-wave-events/id1441897107)

Stay updated on gravitational wave events with real-time alerts from the LIGO/Virgo/KAGRA Collaboration. Explore event locations on an interactive sky map and access educational resources about gravitational waves and observatories.

**Highlights:** Real-time GCN/LVK alerts, Interactive sky map, Event database (O1, O2, O3), GCN Circulars, Public message board, Educational links

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

**In-app purchases:** none

**What reviewers like**

- ✨ Real-time alerts for gravitational wave events
- 🔭 Fascinating for learning about space and physics
- 🌌 Puts earthly concerns into perspective
- 👍 Easy to use and understand for laymen
- 💡 Innovative way to experience space events

**What reviewers complain about**

- 🤔 Technical jargon and lack of explanations
- 🚫 Linked website not accessible for regular users
- 👨‍🏫 Information can be inscrutable for civilians
- ⚖️ Banned for irrelevant comments (user reported)
- 🧐 Data presented is technical and hard to interpret

**Reported bugs**

- Crashes on startup (iOS 14.7.1)

**Requested features**

- Searchable database (e.g., Vera Rubin circulars)
- More explanation of jargon and graphs
- Ability to download notification sound
- Indication of masses of involved objects
- Playback of real sound and frequency wave


### Ninja Learning

[App page](https://appshunter.io/ios/app/ninja-learning/id6781386191)

Master math skills through engaging, bite-sized lessons and interactive quizzes. This app transforms learning arithmetic, fractions, algebra, geometry, calculus, and statistics into a fun adventure with a ninja theme. It offers clear explanations, real-world examples, and progress tracking to help users build confidence and sharpen their minds.

**Highlights:** Bite-sized math lessons, Instant-feedback quizzes, Clear explanations, Real-world examples, Progress tracking, Ninja theme

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

**In-app purchases:** none


## Frequently asked questions

### Is Gravitational Wave Events free?

Gravitational Wave Events is free to download, with no in-app purchases.

### Is Ninja Learning free?

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

### Which has better reviews, Gravitational Wave Events or Ninja Learning?

Ninja Learning is rated higher. Gravitational Wave Events averages 4.8 out of 5 from 133 ratings, while Ninja Learning averages 5.0 from 5 ratings.

### Do Gravitational Wave Events or Ninja Learning have ads?

Neither Gravitational Wave Events nor Ninja Learning shows ads.

### Which is updated more often, Gravitational Wave Events or Ninja Learning?

Gravitational Wave Events ships an update monthly, and Ninja Learning every 5 days. Most recently, Gravitational Wave Events was updated on October 23, 2026 and Ninja Learning on October 22, 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.*