Flags Quiz - Countries Trivia
53
Quality Score
Solid
✍️ Bumetric analysis
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Flags Quiz - Countries Trivia is an Android app from April 21 Studio, currently rated 4.5★ across 39 ratings. Initial signal reads as no scraped reviews yet: judgment based on metadata only.
Quality Score is 53: Solid (established niche player). For an app like this, that means established niche player. 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
$500
per month
→
12-mo forecast
$437 – $1575
per month
→
24-mo forecast
$405 – $3644
per month
INDIE 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
1 snapshots on record
Rating
4.5
Reviews
39 reviews
Forecast Revenue / mo
—
Snapshots tracked
1
since Nov 2026
ONE-TIME · BUILD
💰 Estimated build cost
$80K
↳ What it cost to build · not monthly revenue
Likely range $60K – $110K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
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 |
| 🌐 Cross-platform reach (iOS + Android) | +$27K |
Total estimate
$80K
🛠 Estimated tech stack
🤖
Native Android (Kotlin)
High confidence · 80%
Also possible
Flutter
Heuristic guess from app bundle size, category, store description signals, and release-date stack era. Bumetric does not disassemble binaries — for binary-level certainty you would need an SDK intelligence tool or the manifest itself. Reasoning chain on the right. Full ruleset on /methodology.
Signals we read
| 🏷 Category context | category |
| 📦 Compact Android bundle | → Native Kotlin |
💀 Maintenance status
Active
5%
Last shipped 2026-11-05 · 5 days ago
0 · Active
50 · At risk
100 · Abandoned
Heuristic risk score from time-since-last-update + ratings velocity proxy + Editor's Choice / curated featuring signals. Calibrated against 2024-2025 app-store ranking decay reports. Not a guarantee — a quiet app with a healthy codebase looks the same as an abandoned one until something breaks. Full math on /methodology.
Risk signals
| 📅 5 days since last update | Active development |
Verdict
Active
🔬
How we forecast this revenue
LOW CONFIDENCEBaseline
$500/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
Direction
Headwinds: rating drift may slow acquisition
6 months
$426 – $993
12 months
$437 – $1.6K
24 months
$405 – $3.6K
Compound growth at +6.0% MoM (tier baseline for INDIE). Range widens with horizon — typical noise band ±40% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Early-stage solo · 41/100INDIE TIERexpected for tierRevenue Strength
2.7
Product Quality
3.6
Market Position
0.0
Growth Velocity
5.0
Defensibility
5.0
Operational Safety
10.0
Founder Strength
5.4
Monetization Maturity
1.0
- 💰 Revenue: Marginal — $200 - $1250/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.53★ across 39 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: dev shipping weekly.
- ⚠️ 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 = $9K-$16K. Portfolio play ($826/mo combined) commands premium.
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 3 of 3 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Excellent rating (4.5★)METRIC | +$2,200 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Pre-traction phase (39 ratings)METRIC | −$300 |
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.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Flags Quiz - Countries Trivia
- Developer
- April 21 Studio
- Bundle ID
- com.eigame.app.flagsquiz
- App Store URL
- Not found
- Category
- Not found
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- Not found
- Tagline
- Not found
- Description
- Not found
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Not found
Revenue
- Reported revenue signal / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- Model estimate / mo
- Not found
- Top-grossing rank
- Not found
- 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.
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
Welcome to Flags Quiz, a puzzle game for flag lovers and geography fans. In this era of globalization, it is imperative to understand the culture and history of various countries. Flags Quiz allows you to explore the world in a relaxed and enjoyable gaming environment through interactive learning. From Africa to Europe, from Asia to America, this game brings together the flags of more than 200 countries and regions, providing an educational and fun platform to help you deepen your understanding of the world.
📌Gameplay
Flags Quiz is simple and intuitive to operate.… View full description on the official store →
📌Gameplay
Flags Quiz is simple and intuitive to operate.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v1.2.3🔄 updated 5d ago💰 Free / Ads / IAP
🔔
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📝 Description
95
BU Score · Transcendent
More by April 21 Studio
View all →📦 Portfolio summaryMID studio
18apps·$734K/mocombined
⚠ Concentrated — top app contributes 95% of combined revenue (single-app dependency)
About this analysis
Why low confidence: only 39 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
❓ Frequently Asked Questions
5 answers · auto-generated from this app's public dataWhat is Flags Quiz - Countries Trivia built with?▴
Our heuristic places Flags Quiz - Countries Trivia on the Native Android (Kotlin) stack (High confidence, 80%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.
Is Flags Quiz - Countries Trivia still actively maintained?▴
Maintenance status: Active (5% abandonment risk). Last shipped version was 5 days ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
When was Flags Quiz - Countries Trivia last updated?▴
Flags Quiz - Countries Trivia last shipped a new version on 2026-11-05 — less than a month ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes Flags Quiz - Countries Trivia?▴
Flags Quiz - Countries Trivia is published by April 21 Studio on the Google Play 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 Flags Quiz - Countries Trivia's BU Score?▴
Flags Quiz - Countries Trivia has a BU Score of 53/100 (Solid). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.