65
Quality Score
Solid
Quell Zen
Why medium confidence: 551 ratings · no founder-verified revenue (model estimate only).
✍️ bumetric analysis
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Quell Zen is an Android app from FallenTreeGames in the Puzzle category, currently rated 4.6★ across 551 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 65: Solid (established niche player). For a Puzzle app, 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.
💰 Revenue · today and ahead
Today
$5.9K/mo
In 12 months
$6.1K – $12.8K
In 24 months
$7.6K – $22.8K
MID 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
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD💰 Estimated build cost
$205K
↳ What it cost to build · not monthly revenue
Likely range $155K – $275K
$25K · MVP floor$100K · indie scale$500K+ · studio build
📈Pays back in ~2.9y 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 |
| 💎In-app purchase plumbing | +$9K |
| ⚙Puzzle complexity ×1.60 | +$35K |
| 🌐Cross-platform reach (iOS + Android) | +$52K |
| ⚙9.9y maintenance × ~1-person team | +$59K |
Total estimate$205K
ONE-TIME · EXIT VALUE💵 Estimated acquisition value
$175K
↳ What it would sell for · not monthly revenue
Marketplace range $125K – $225K · 29× MRR multiple
💸~0.9× build cost (under-water)
Synthetic estimate. Multiple band derived from iap / freemium model + 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
| 💎IAP / freemium model base | 28× MRR |
| 📅9.9y proven track record | +20% |
| ⭐★ rating ≥ 4.4 (solid) | +8% |
| 🏷Puzzle category multiple | -12% |
| ⭐Small user base (<1K ratings) | -8% |
Final multiple29× MRR
👥 Estimated audience size
61K
Lifetime downloads (US-equivalent)
Monthly active
3.2K
Daily active
1.0K
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
| 📲Puzzle engagement | ~160 installs / rating |
| 📅9.9y of rating accumulation | -30% |
| 🔁Puzzle D30 retention | 10% |
| 📍DAU / MAU stickiness | 0.32 |
DAU / MAU31% sticky
🛠 Estimated tech stack
🤖
Native Android (Kotlin)
Medium confidence · 55%
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 | Puzzle |
| 📦Tiny game bundle | → Native 2D engine |
💀 Maintenance status
Likely abandoned
88%
Last shipped 2022-03-11 · 1535 days ago
0 · Active50 · At risk100 · 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
| 📅4y+ since last update | Likely abandoned |
VerdictLikely abandoned
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$5.9K/mo · ML-estimated from 234 triggers
Growth rate
+4.0% MoM · MID tier baseline (compound monthly)
6 months
$5.6K – $9.4K
12 months
$6.1K – $12.8K
24 months
$7.6K – $22.8K
Compound growth at +4.0% MoM (tier baseline for MID). Range widens with horizon — typical noise band ±25% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Building · 56/100MID TIERcompetitive build-outGrowth Velocity
5.0
Founder Strength
7.3
Product Quality
6.5
Revenue Strength
3.8
Monetization Maturity
5.0
Defensibility
9.9
Market Position
0.0
Operational Safety
7.0
- 💰 Revenue: Modest — $4K - $8K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.63★ across 551 reviews — solid.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 1530d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (1530d since update).
🎯 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 = $106K-$189K. Portfolio play ($59K/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 4 of 4 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($3.49)METRIC | +$2,800 | |
| Excellent rating (4.6★)METRIC | +$2,200 | |
| Mature app (9y old)METRIC | +$1,500 | |
| Early-stage install base (551 ratings)METRIC | +$400 |
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.
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v1.13🔄 updated 4y ago📂 Puzzle💰 Free📺 Ad-supported💎 IAP $0.99 - $2.99 per item🚀 Launched 2016 (9y old)
📝 About this app
Quell Zen - the very embodiment of relaxing logic games - features over 200 beautifully crafted challenges.
This serene puzzler has you guiding raindrops through a series of colorful mazes. Enhanced by atmospheric orchestral music, the game's subtle, sophisticated mechanics evolve as you navigate its many levels, delivering an absorbing experience that's familiar but always fresh.
Set against a narrative of a Japanese family divided, Quell Zen will take you on an unforgettable journey. Step inside this beautiful world today.
This serene puzzler has you guiding raindrops through a series of colorful mazes. Enhanced by atmospheric orchestral music, the game's subtle, sophisticated mechanics evolve as you navigate its many levels, delivering an absorbing experience that's familiar but always fresh.
Set against a narrative of a Japanese family divided, Quell Zen will take you on an unforgettable journey. Step inside this beautiful world today.
🧪
Tech & Domain Intel — fallentreegames.com
- Mail provider
- Google Workspace
Derived from public RDAP + DNS TXT records (no scraping, no login).
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Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Quell Zen
- Developer
- FallenTreeGames
- Bundle ID
- com.fallentreegames.google.quellzen
- App Store URL
- Open in App Store
- Category
- Puzzle
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- fallentreegames.com
- Tagline
- Not found
- Description
- Not found
- 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
- $5.9K/mo
- Top-grossing rank
- Not found
- All-time revenue
- Not found
- Pricing
- $0.99 - $2.99 per item
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 growth551 ratings+27% lifetimeShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
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.
More by FallenTreeGames
View all →📦 Portfolio summaryINDIE studio
8apps·$59K/mocombined
✓ Diversified — top app contributes 31%; risk spread across portfolio
Full revenue analysis
Read the article-style breakdown for Quell Zen: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
❓ Frequently Asked Questions
10 answers · auto-generated from this app's public dataHow much does Quell Zen make per month?▾
Based on our ML-calibrated revenue forecast, Quell Zen earns approximately $5.9K/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.
Is Quell Zen profitable?▾
With estimated build cost $205K and monthly revenue $5.9K, Quell Zen looks break-even-grade — payback period sits around 2.9 years. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
How many users does Quell Zen have?▾
Estimated audience: ~61K lifetime downloads, ~3K monthly active users, and ~1K daily active users. Derived from ratings count × category installs-per-rating × age decay. US-storefront-equivalent — global audience can be 5-10× larger for internationally-distributed apps.
What apps are like Quell Zen?▾
Browse the full Puzzle 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.
What is Quell Zen built with?▾
Our heuristic places Quell Zen on the Native Android (Kotlin) stack (Medium confidence, 55%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.
Is Quell Zen still actively maintained?▾
Maintenance status: Likely abandoned (88% abandonment risk). Last shipped version was 4+ years ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
How much would Quell Zen sell for?▾
Estimated acquisition value: $175K (marketplace range $125K – $225K). Calculated as 29× monthly revenue using the standard multiple for the detected monetization model + adjustments for age, rating quality and category demand. Calibrated against 2024-2026 Flippa / Acquire.com / MicroAcquire closed-deal medians.
When was Quell Zen last updated?▾
Quell Zen last shipped a new version on 2022-03-11 — more than 4 year(s) ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes Quell Zen?▾
Quell Zen is published by FallenTreeGames 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 Quell Zen's BU Score?▾
Quell Zen has a BU Score of 65/100 (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.