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71
BU Score
Strong

Grammar Games for Prepositions

4.6 ✍️ Editor
✍️ BU Analytics Review

Grammar Games for Prepositions is an iOS app from MasterKey Games in the News category, currently rated 4.6★ across 1,162 ratings. Initial signal reads as mostly critical sentiment so far — users flag rough edges and unmet expectations.

Our BU Score puts it at 71Strong (healthy traction). For a News app, that means healthy traction.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

creator

📊 Performance Tracking LIVE

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idle
0%
Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 6 of 6 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Excellent rating (4.6★)METRIC
+$2,200
5 starREVIEW
+$1,800
Low install base (1,162 ratings)METRIC
+$1,500
Mature app (8y old)METRIC
+$1,500
highly recommendREVIEW
+$1,400
Ad-supported / freemiumMETRIC
+$600
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 67 MB🔞 4+📱 iOS 11.0+🔖 v1.21🔄 updated 5mo ago🌐 EU, EN, ES📂 News💰 Paid🚀 Launched 2017 (8y old)

📝 About this app

Learn prepositions in English and grammar free by putting the prepositions in place to form correct sentences and sayings.

Preposition Master is a fun and educational game for kids and English language students of all ages who want to learn and improve their language skills in a more entertaining way.

How do you play?

It’s easy. The game consists of putting the prepositions from each level in the correct place to form a correct sentence. (Beginner, competent, professional, expert, sayings.)

If you make a mistake and click the incorrect preposition, there is a time penalty.

Once you have completed the sentence you will receive a score based on how fast you were and your total number of errors.

You can share your knowledge with other players worldwide thanks to online multiplayer mode or with your friends on Game Center.

Are you an English expert who wants to show off your skills? Are you an English student who wants to improve your skills? Preposition Master will help you use prepositions in sentences correctly.

Preposition Master is the first game of its kind designed and developed completely by educators to help students improve one of the biggest problems language learners all face, correct use of prepositions. With four levels from beginner to expert, Preposition Master is a challenge for everyone from the Beginner to the most seasoned English language communicators. The Proverbs and Sayings level is a great way to learn and remember popular English idioms and expressions.

These are the levels:

Beginner: Ideal for children. This level contains the easiest sentences with the fewest prepositions to work with.

Competent: This is where things start to get harder. This level is great for learners who are a bit farther along in their English language learning adventure.

Professional: Great for users with a solid base in English who want to keep their skills up to date.

Expert: Only for those with the most proficient English skills. Are you one of them?

Do you have what it takes to become the next Preposition Master? Try your luck in single player mode or against friends and other players worldwide.
Learn English with a smile on your face.

Designed by masterKey games and the educators at masterKey english.

🆕 What's New · v1.21

Thanks for using Preposition Master! We hope it is helping you learn better English as you play.

In this update:
- Enhanced Performance
- Content Revision
- Minor Bug Fixes

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
Grammar Games for Prepositions
Developer
MasterKey Games
Bundle ID
com.masterkeygames.prepmaster
App Store URL
Open in App Store
Category
News
Content rating
4+
Languages
EU, EN, ES

Company

Website
masterkeygames.com
Tagline
MasterKey Games- Mobile Games for Language Learning
Description
MasterKey Games - Learn languages by playing. iOS and Android games like Sentence Master and Esaera Zaharrak. Download our educational games now!
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
Not found

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$18.5K/mo
Top-grossing rank
Outside top 100 in US News
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
Not found
LinkedIn
Not found
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
Not found
Press / News
Not found

Contacts & Socials

Socials
Not found
Email
Not found
Phone
Not found
Contact page
https://www.masterkeygames.com/contact/
About page
Not found
📈Ratings growth1,162 ratings+116100% lifetimeShow 3-year history estimate ▾Oct 2017Feb 2024May 2026
Tracked (25 weeks) Pre-tracking estimate (37 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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