53
Quality Score
Solid
Human Skeleton Reference Guide
✍️ bumetric analysis
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Human Skeleton Reference Guide is an iOS app from Ryan Bittorf in the Education category, currently rated 4.0★ across 5 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 53: Solid (established niche player). For a Education 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
$5.0K/mo
In 12 months
$5.2K – $10.8K
In 24 months
$6.4K – $19.2K
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
💰 Estimated build cost
$125K
Likely range: $95K – $170K
Synthetic estimate derived from category, file size, screen count, monetization layer, and platform reach. Methodology benchmarks: Clutch + GoodFirms 2024-2026 agency surveys. See /methodology.
Breakdown
| MVP baseline (design + 1-store ship) | +$28K |
| 5 unique screens × $4.5K | +$22K |
| Education complexity ×1.20 | +$10K |
| 11.0y maintenance × ~1-person team | +$65K |
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$5.0K/mo · ML-estimated from 234 triggers
Growth rate
+4.0% MoM · MID tier baseline (compound monthly)
Direction
Headwinds: rating drift may slow acquisition
6 months
$4.7K – $7.9K
12 months
$5.2K – $10.8K
24 months
$6.4K – $19.2K
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.
📅
What Worked™ · Development Pipeline
4 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
💲
Went paid — introduced $4.99 price point
2026-03
⭐
Rating ↓ 4.33 → 4.00 (dropped 0.33★)
2016-09
⭐
Rating ↓ 5.00 → 4.50 (dropped 0.50★)
2015-09
🚀
First tracked snapshot — initial data captured
📊
BU Investment Matrix
Below median · 42/100MID TIERunderperforming peersGrowth Velocity
5.0
Founder Strength
6.0
Product Quality
3.2
Revenue Strength
3.7
Monetization Maturity
1.0
Defensibility
6.0
Market Position
2.0
Operational Safety
7.0
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.0★ across 5 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 1173d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (1173d 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 = $90K-$160K. Portfolio play ($19K/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.
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 0★ | 0 | — |
| 🇧🇷 BR | 0★ | 0 | — |
| 🇨🇦 CA | 0★ | 0 | — |
| 🇩🇪 DE | 0★ | 0 | — |
| 🇫🇷 FR | 0★ | 0 | — |
| 🇬🇧 GB | 0★ | 0 | — |
| 🇮🇳 IN | 0★ | 0 | — |
| 🇯🇵 JP | 0★ | 0 | — |
| 🇺🇸 US | 4★ | 5 | 4★ this version |
🔔
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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 7 of 7 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($0.00)METRIC | +$2,800 | |
| 5 starREVIEW | +$1,800 | |
| excellent appREVIEW | +$1,500 | |
| Mature app (10y old)METRIC | +$1,500 | |
| Good rating (4.0★)METRIC | +$800 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (5 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.
App Specs
🔐 Own this app? Claim & verify MRR →💾 10 MB🔞 12+📱 iOS 15.0+🔖 v2.2.0🔄 updated 3y ago🌐 EN📂 Education💰 Paid🚀 Launched 2015 (10y old)
📝 About this app
A beautifully designed reference guide of the human skeletal system. Detailed descriptions of bone anatomy are viewable from the anterior, posterior or lateral perspectives. See all labelling at a glance. Navigate through the entire skeleton swiftly.
Regions of Skeleton include:
Head (Skull / Teeth)
Torso (Rib Cage / Vertebrae)
Shoulder (Scapula / Clavicle / Humerus)
Forearm (Ulna / Radius)
Hand (Carpals / Metacarpals / Phalanges)
Thigh (Pelvis / Femur / Patella)
Shin (Tibia / Fibula)
Foot (Tarsals / Metatarsals / Phalanges)
Regions of Skeleton include:
Head (Skull / Teeth)
Torso (Rib Cage / Vertebrae)
Shoulder (Scapula / Clavicle / Humerus)
Forearm (Ulna / Radius)
Hand (Carpals / Metacarpals / Phalanges)
Thigh (Pelvis / Femur / Patella)
Shin (Tibia / Fibula)
Foot (Tarsals / Metatarsals / Phalanges)
🆕 What's New · v2.2.0
UI enhances for both iPhone and iPad
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Human Skeleton Reference Guide
- Developer
- Ryan Bittorf
- Bundle ID
- com.ryanbittorf.Skeleton
- App Store URL
- Open in App Store
- Category
- Education
- Content rating
- 12+
- Languages
- EN
Company
- Website
- Not found
- Tagline
- Today
- Description
- Find apps and games for iPhone, iPad, Mac, and more on the App Store.
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- OG image
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $19.0K/mo
- Top-grossing rank
- Outside top 100 in US Education
- 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 growth5 ratings+400% lifetimeShow 3-year history estimate ▾
Tracked (5 weeks) Pre-tracking estimate (36 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.
💰Pricing History$0.00 → $4.99 (+0%)
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 Ryan Bittorf
View all →📦 Portfolio summaryINDIE studio
5apps·$19K/mocombined
⚠ Concentrated — top app contributes 97% of combined revenue (single-app dependency)
Full revenue analysis
Read the article-style breakdown for Human Skeleton Reference Guide: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.