Grammar Games for Prepositions
71
Quality Score
Strong
Grammar Games for Prepositions
Medium confidence
✍️ bumetric analysis
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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.
Quality Score is 71: Strong (healthy traction). For a News app, that means healthy traction. The full BU Investment Matrix below scores 8 dimensions including monetisation, growth, and operational risk.
Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.
💰 Monthly revenue · now vs forecast
● Right now
$700K
per month
→
12-mo forecast
$741K – $1141K
per month
→
24-mo forecast
$886K – $1645K
per month
BIG tier
💡 Grow this revenue
Free AI audit of this app’s store listing
- Title & subtitle keyword fit
- Description hook & conversion structure
- Screenshots, ratings, reviews strategy
Typical impact: +2-5× organic installs
📊 Performance Tracking LIVE
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD
💰 Estimated build cost
$70K
↳ What it cost to build · not monthly revenue
Likely range $50K – $95K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~4 months at current MRR
Synthetic estimate. Inputs: category complexity, file size, screen count, monetization layer, platform reach, age × team-size proxy. Calibrated against 2024-2026 indie-agency rate surveys. Full math + source list on /methodology.
Where the money goes
| 🧱 MVP baseline (design + 1-store ship) | +$28K |
| 📱 5 unique screens × $4.5K | +$22K |
| 📦 Asset bundle (67 MB) | +$6K |
| ⚙ News complexity ×1.20 | +$11K |
Total estimate
$70K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$275K
↳ What it would sell for · not monthly revenue
Marketplace range $225K – $375K · 15× MRR multiple
💸
~3.9× return on build cost
Synthetic estimate. Multiple band derived from ad-supported + age, rating quality, category demand, and user-base maturity. Calibrated against 2024-2026 indie-app-marketplace closed-deal medians. Full math + comparable deal list on /methodology.
How the multiple was built
| 📺 Ad-supported base | 15× MRR |
| ⭐ ★ rating ≥ 4.4 (solid) | +8% |
| 🏷 News category multiple | -5% |
Final multiple
15× MRR
👥 Estimated audience size
135K
Lifetime downloads (US-equivalent)
Monthly active
20K
Daily active
9.0K
Synthetic estimate from ratings × category benchmarks. Calibrated against 2024-2026 mobile-attribution retention + DAU/MAU reports. Numbers are US-storefront-equivalent — true global audience can be 5-10× larger for international apps. Full math + source list on /methodology.
How we sized it
| 📲 News engagement | ~120 installs / rating |
| 🔁 News D30 retention | 15% |
| 📍 DAU / MAU stickiness | 0.45 |
DAU / MAU
45% sticky
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$700K/mo · ML-estimated from 234 triggers
Growth rate
+2.5% MoM · BIG tier baseline (compound monthly)
6 months
$690K – $933K
12 months
$741K – $1.1M
24 months
$886K – $1.6M
Compound growth at +2.5% MoM (tier baseline for BIG). Range widens with horizon — typical noise band ±15% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Mixed signals · 57/100BIG TIERcompetitive but cautiousGrowth Velocity
5.0
Founder Strength
7.2
Product Quality
8.3
Revenue Strength
5.8
Monetization Maturity
1.0
Defensibility
7.2
Market Position
2.0
Operational Safety
9.0
- 💰 Revenue: Healthy — $280K - $1540K/mo · BIG tier · medium-low confidence, trajectory unclear.
- ⭐ Quality: 4.6★ across 1,162 reviews — strong (top 10%).
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: last update 199d ago — slow cadence.
- ⚠️ Risk: Low — no material risk signals detected.
🎯 For competitors: Mixed picture. Worth competing if you have a clear UX or pricing edge — otherwise crowded segment.
💵 For acquirers: Estimated asking range 18-32× monthly = $12.6M-$22.4M.
Composite of 8 dimensions computed deterministically from public signals — no LLM, every score traces back to a measurable input. Default weights shown; "compete" / "acquire" / "invest" lenses re-weight without re-fetching.
Range:
💰 Forecast Revenue / mo
MODELRevenue 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
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🆕 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
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
- Not found
- 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
Founder data not yet collected for this app.
Funding
Funding data not yet collected for this app.
Press & Links
Press & Links data not yet collected for this app.
Contacts & Socials
Contacts & Socials data not yet collected for this app.
📈Ratings growth1,162 ratings+116100% lifetimeShow 3-year history estimate ▾
Tracked (26 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.
📝 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.… View full description on the official store →
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.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 67 MB🔞 4+📱 iOS 11.0+🔖 v1.21🔄 updated 0d ago🌐 EU, EN, ES📂 News💰 Paid
📅
What Worked™ · Development Pipeline
7 EVENTS TRACKEDDetected changes in this app over its tracked lifetime — each event links cause (what changed) to effect (what moved). Sorted newest first.See full history →Version history →
2026-05
📈
Crossed 50 ratings — social-proof flywheel kicking in
2026-05
🔄
Monetization changed: freemium → free
2026-03
⭐
Rating ↑ 3.64 → 4.50 (improved 0.86★)
2020-03
⭐
Rating ↓ 4.60 → 4.27 (dropped 0.33★)
2020-01
📈
Crossed 10 ratings — social-proof flywheel kicking in
2019-07
⭐
Rating ↓ 5.00 → 4.56 (dropped 0.44★)
2017-10
🚀
First tracked snapshot — initial data captured
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 4.52576★ | 97 | 4.52576★ this version |
| 🇧🇷 BR | 4.79839★ | 124 | 4.79839★ this version |
| 🇨🇦 CA | 4.64964★ | 137 | 4.64964★ this version |
| 🇩🇪 DE | 4.55★ | 20 | 4.55★ this version |
| 🇫🇷 FR | 4.34999★ | 20 | 4.34999★ this version |
| 🇬🇧 GB | 4.55696★ | 79 | 4.55696★ this version |
| 🇮🇳 IN | 4.72222★ | 162 | 4.72222★ this version |
| 🇯🇵 JP | 4.65714★ | 35 | 4.65714★ this version |
| 🇺🇸 US | 4.59863★ | 1,171 | 4.59863★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Grammar Games for Prepositions: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
More by MasterKey Games
View all →📦 Portfolio summaryINDIE studio
11apps·$51K/mocombined
✓ Diversified — top app contributes 36%; risk spread across portfolio
About this analysis
Why medium confidence: 1,162 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Grammar Games for Prepositions make per month?▴
Based on our ML-calibrated revenue forecast, Grammar Games for Prepositions earns approximately $18K/mo. This is a US-storefront-equivalent estimate; global revenue can be several times larger for internationally-distributed apps. See the methodology page for the full formula and confidence bands.
What apps are like Grammar Games for Prepositions?▴
Browse the full News category catalog to find similar apps with revenue, build cost, audience and tech stack data. Each /p/{slug} page also shows a Compare side-by-side widget with three peer apps from the same niche.
Who makes Grammar Games for Prepositions?▴
Grammar Games for Prepositions is published by MasterKey Games on the Apple App Store. See the full publisher portfolio (other apps by the same developer) via the More by developer block on the product page above.
What is Grammar Games for Prepositions's BU Score?▴
Grammar Games for Prepositions has a BU Score of 71/100 (Strong). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.