old room -Escape from book-
35
Quality Score
Emerging
old room -Escape from book-
Medium confidence
✍️ bumetric analysis
“
old room -Escape from book- is an Android app from IzumiArtisan in the Adventure category, currently rated 1.0★ across 8,964 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Quality Score is 35: Emerging (early traction worth watching). For a Adventure app, that means early traction worth watching. 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
$1.0K
per month
→
12-mo forecast
$915 – $3299
per month
→
24-mo forecast
$848 – $7631
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
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD
💰 Estimated build cost
$165K
↳ What it cost to build · not monthly revenue
Likely range $125K – $225K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Slow ROI — current MRR is well below build cost
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 |
| ⚙ Adventure complexity ×2.10 | +$55K |
| 🌐 Cross-platform reach (iOS + Android) | +$58K |
Total estimate
$165K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$10K
↳ What it would sell for · not monthly revenue
Marketplace range $10K – $15K · 10× MRR multiple
💸
~0.1× build cost (under-water)
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 < 3.5 (weak) | -18% |
| 🏷 Adventure category multiple | -15% |
Final multiple
10× MRR
👥 Estimated audience size
1.2M
Lifetime downloads (US-equivalent)
Monthly active
150K
Daily active
45K
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
| 📲 Adventure engagement | ~140 installs / rating |
| 🔁 Adventure D30 retention | 12% |
| 📍 DAU / MAU stickiness | 0.30 |
DAU / MAU
30% 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 | Adventure |
| 📦 Tiny game bundle | → Native 2D engine |
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$1.0K/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
$891 – $2.1K
12 months
$915 – $3.3K
24 months
$848 – $7.6K
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
Pre-traction · 33/100INDIE TIERlimited signalGrowth Velocity
5.0
Founder Strength
5.4
Product Quality
1.8
Revenue Strength
3.0
Monetization Maturity
1.0
Defensibility
3.5
Market Position
0.0
Operational Safety
7.0
- 💰 Revenue: Modest — $418 - $2617/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 1.0★ across 8,964 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: last update 283d ago — slow cadence.
- ⚠️ Risk: Moderate — 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 = $18K-$33K. Portfolio play ($5K/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:
| Low install base (8,964 ratings)METRIC | +$1,500 | |
| Below-average rating (1.0★)METRIC | −$1,500 | |
| 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.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- old room -Escape from book-
- Developer
- IzumiArtisan
- Bundle ID
- com.izumiartisan.old_room
- App Store URL
- Open in App Store
- Category
- Adventure
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- izumi-artisan.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
- $1.0K/mo
- 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
old room -Escape from book-
*English version.
It is the second phase of a free escape game of android which carries out the tap of the screen and looks for it.
Investigating various items and rooms, let's solve a mystery and escape from the world of a book.
Search every places carefully. You may find useful hints or items.
Some items cannot be used itself.
Use together and set them apart.
Try various possibilities.
Tips of old room
http://izumi-artisan.com/old_room/tips_mb_en.html
Compatible terminal : Android Smartphone
Compliant version : Android 2.1 and upper version… View full description on the official store →
*English version.
It is the second phase of a free escape game of android which carries out the tap of the screen and looks for it.
Investigating various items and rooms, let's solve a mystery and escape from the world of a book.
Search every places carefully. You may find useful hints or items.
Some items cannot be used itself.
Use together and set them apart.
Try various possibilities.
Tips of old room
http://izumi-artisan.com/old_room/tips_mb_en.html
Compatible terminal : Android Smartphone
Compliant version : Android 2.1 and upper version… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v2.0.4🔄 updated 0d ago📂 Adventure💰 Free📺 Ad-supported
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for old room -Escape from book-: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
More by IzumiArtisan
View all →📦 Portfolio summaryINDIE studio
4apps·$5K/mocombined
✓ Diversified — top app contributes 48%; risk spread across portfolio
About this analysis
Why medium confidence: 8,964 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does old room -Escape from book- make per month?▴
Based on our ML-calibrated revenue forecast, old room -Escape from book- earns approximately $1.0K/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 old room -Escape from book-?▴
Browse the full Adventure 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 old room -Escape from book-?▴
old room -Escape from book- is published by IzumiArtisan 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 old room -Escape from book-'s BU Score?▴
old room -Escape from book- has a BU Score of 35/100 (Emerging). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.