Comparison

Osmo Newton vs Grammar Ninja

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Osmo Newton

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
Read full description

Solve creative physics puzzles by drawing lines or placing items in front of the screen. Play your favourite Osmo Newton on both iPhone and iPad! Use your iPhone with the "Osmo Base for iPad" which can be found at playosmo.com. * Please see our device compatibility list here: https://support.playosmo.com/hc/articles/115010156067 "..games that interact with just about any physical object—pen, paper, blocks, even toys your kids already own. - The Wall Street Journal "This interplay between the physical and digital realms looks and feels like magic." - Forbes "Osmo has been a revolution in our family." - Wired Awarded: **Best Design** - Good Design, 2016 **Best Product Designs** - Fast Company Finalist, 2016 **Innovative Toy of the Year** - TOTY Finalist, 2015 **Best Inventions** - TIME, 2014 Works with any object or drawing – Mom’s keys, hand-drawn basket, even toys you already own. Simply place the object/drawing in front of the screen and manipulate it to guide the falling balls into the target zones. About Osmo Osmo is using the screen to create a new healthy, hands-on learning experience that promotes creativity, problem-solving and social interaction. We do this with our reflective artificial intelligent technology.

About

Grammar Ninja

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
Read full description

Your mission is to throw ninja stars at words! These words are sneaky and have hidden themselves in grammatically correct sentences. Use your grammar skills to find your targets, and become the ultimate ninja master!

Screenshots

Osmo Newton4 screens
Grammar Ninja4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Osmo Newton versus Grammar Ninja: the parameters behind the verdict, then further details
ParameterOsmo NewtonGrammar Ninja
PriceFreeFree
Rating4.1 (384 ratings)5.0 (52 ratings) — better
Positive reviews65.4% of reviews100.0% of reviews — better
Number of ratings384 — better52
Update frequencyEvery 2 months — betterEvery 8 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size451 MB179 MB
Age rating4+12+
DeveloperTangible PlayGreg Lieberman

Customer experience

Osmo Newton

All ratings383 ratings
Positive75.5%
Neutral6.8%
Negative17.8%
Written reviews81 reviews
Positive65.4%
Neutral8.6%
Negative25.9%

Grammar Ninja

All ratings52 ratings
Positive98.1%
Neutral1.9%
Negative0.0%
Written reviews36 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

User reviews

Osmo Newton

From 384 App Store ratings

What we love

  • 🎮 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

Room to improve

  • 🐛 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

Grammar Ninja

From 52 App Store ratings

What we love

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

Room to improve

  • ↔️ Limited side-to-side movement on iPad

Bugs and requests

Osmo Newton

Reported bugs

10 issues
  • 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
Show 5 more
  • Camera permission prompt issues on newer iOS
  • Line detection fails to recognize drawings
  • Game slows down significantly with multiple balls
  • App fails to load or gets stuck on loading screen
  • Whiteboard compatibility issues

Requested features

8 requests
  • 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
Show 3 more
  • Better instructions and tutorial for beginners
  • Start button before gameplay begins
  • Support for older iPad models

Grammar Ninja

Requested features

1 request
  • Side-to-side movement for iPad

In-app purchases

None

Osmo Newton

No in-app purchases

6 purchases

Grammar Ninja

One-time6
  • 100 Diamonds$0.99
  • 550 Diamonds$4.99
  • 1200 Diamonds$9.99
Show 3 more
  • 2500 Diamonds$19.99
  • 5200 Diamonds$39.99
  • 15000 Diamonds$99.99

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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