# Osmo Newton vs Grammar Ninja

The clearest difference is rating: Grammar Ninja at 5.0 against Osmo Newton's 4.1. Grammar Ninja also leads on review sentiment (100% vs 65%) and iOS requirement (13.0 vs 15.0). Osmo Newton's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price, monetization model and device support there is nothing between them.

Both are free to download. Grammar Ninja sells 6 one-off in-app purchases. Osmo Newton asks for nothing beyond the download.

Grammar Ninja holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Osmo Newton has 384 ratings behind it against 52, so its average is the more settled of the two. Written reviews point the same way: 65% of Osmo Newton's written reviews are positive against 100% of Grammar Ninja's.

Osmo Newton ships an update every 2 months, Grammar Ninja every 8 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Osmo Newton | Grammar Ninja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (384 ratings)](https://appshunter.io/ios/app/osmo-newton/id876524974/reviews) | **[5.0 (52 ratings)](https://appshunter.io/ios/app/grammar-ninja/id1443711891/reviews)** |
| Number of ratings | **384** | 52 |
| Positive reviews | 65.4% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 451 MB | 179 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Tangible Play](https://appshunter.io/developer/799157444) | [Greg Lieberman](https://appshunter.io/developer/1596441353) |

## What reviewers say

### Osmo Newton

[App page](https://appshunter.io/ios/app/osmo-newton/id876524974)

Engage with creative physics puzzles by drawing or placing physical objects. Guide falling balls into target zones using everyday items. Experience a blend of physical and digital play.

**Highlights:** Draw lines to solve puzzles, Place physical objects to interact, Guide falling balls into targets, Works with everyday items, Hands-on learning experience, Promotes creativity and problem-solving

**In-app purchases:** none

**What reviewers like**

- 🎮 Engaging and fun gameplay for all ages
- 🧠 Educational value with physics and problem-solving
- ✨ Satisfying visual feedback and animations
- 👨‍👩‍👧‍👦 Great for family bonding and social play
- 🎨 Creative drawing mechanics

**What reviewers complain about**

- 🐛 Frequent app crashes and freezing
- 📱 Compatibility issues with newer iPad models and iOS versions
- 👁️ Line detection sensitivity problems
- 🖐️ Hand obstruction during gameplay
- 💡 Poor lighting recognition for drawn lines

**Reported bugs**

- App crashes on launch or during gameplay
- Unresponsive app after recent updates
- Lorem Ipsum placeholder text stuck on screen
- Achievement page frozen preventing gameplay
- App incompatible with iPad Air 2 and 11-inch iPad

**Requested features**

- Back/front camera option for better positioning
- Pause menu functionality
- More levels beyond the current 61
- Grid screen option for better line detection
- Adjustable camera sensitivity settings


### Grammar Ninja

[App page](https://appshunter.io/ios/app/grammar-ninja/id1443711891)

Engage in a word game where you identify grammatically correct sentences by targeting specific words with ninja stars. Hone your grammar skills to become a master word ninja.

**Highlights:** Target words in sentences, Identify grammatically correct sentences, Improve grammar skills, Word-based ninja game

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 Diamonds | $0.99 | one-time |
| 550 Diamonds | $4.99 | one-time |
| 1200 Diamonds | $9.99 | one-time |
| 2500 Diamonds | $19.99 | one-time |
| 5200 Diamonds | $39.99 | one-time |
| 15000 Diamonds | $99.99 | one-time |

**What reviewers like**

- 👍 Fun and engaging gameplay
- 💡 Educational and improves grammar
- 🚀 Great for all ages
- ✨ Visually appealing graphics
- ✅ Easy to use and understand

**What reviewers complain about**

- ↔️ Limited side-to-side movement on iPad

**Requested features**

- Side-to-side movement for iPad


## Frequently asked questions

### Is Osmo Newton free?

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

### Is Grammar Ninja free?

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

### Which has better reviews, Osmo Newton or Grammar Ninja?

Grammar Ninja is rated higher. Osmo Newton averages 4.1 out of 5 from 384 ratings, while Grammar Ninja averages 5.0 from 52 ratings.

### Do Osmo Newton or Grammar Ninja have ads?

Grammar Ninja shows ads; Osmo Newton does not.

### Which is updated more often, Osmo Newton or Grammar Ninja?

Osmo Newton ships an update every 2 months, and Grammar Ninja every 8 months. Most recently, Osmo Newton was updated on November 6, 2026 and Grammar Ninja on November 2, 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.*