53
Quality Score
Solid
Human Skeleton Reference Guide
Why low confidence: only 5 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
✍️ bumetric analysis
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ℹ️ Honest verdict for low-signal apps
Human Skeleton Reference Guide is a early-stage iOS app in the education space with weak public traction — only 5 ratings, no founder-verified MRR, and not ranked in any monitored grossing chart. The app appears to be monetised, but public signals are too sparse for a precise revenue estimate. Treat all revenue, audience and acquisition-value numbers below as directional only — not founder-verified facts.
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
ONE-TIME · BUILD💰 Estimated build cost
$125K
↳ What it cost to build · not monthly revenue
Likely range $95K – $170K
$25K · MVP floor$100K · indie scale$500K+ · studio build
📈Pays back in ~7 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 |
| ⚙Education complexity ×1.20 | +$10K |
| ⚙11.0y maintenance × ~1-person team | +$65K |
Total estimate$125K
ONE-TIME · EXIT VALUE💵 Estimated acquisition value
$325K
↳ What it would sell for · not monthly revenue
Marketplace range $250K – $425K · 18× MRR multiple
💸~2.6× 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 |
| 📅11.0y proven track record | +20% |
| 🏷Education category multiple | +6% |
| ⭐Small user base (<1K ratings) | -8% |
Final multiple18× MRR
🛠 Estimated tech stack
🍎
Native iOS (Swift / UIKit)
High confidence · 80%
Also possible
Native iOS (SwiftUI)
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
| 📦App bundle size | 10 MB |
| 🏷Category context | Education |
| 📦Compact iOS bundle | → Native Swift / UIKit (pre-2020 era) |
💀 Maintenance status
Likely abandoned
95%
Last shipped 2023-03-05 · 1175 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
| 📅3y+ since last update | Likely abandoned |
| 👥Small user base (5 ratings) + 11.0y old | +10% (solo-project pattern) |
| •11y old + 1y+ no update | +5% (API deprecation drift) |
VerdictLikely abandoned
🔬
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.
📊
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.
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
📅
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
🌍
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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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
- Available
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)
❓ Frequently Asked Questions
7 answers · auto-generated from this app's public dataHow much does Human Skeleton Reference Guide make per month?▾
Low-confidence model estimate. Human Skeleton Reference Guide has only 5 App Store ratings, so our revenue model has very little signal to work with — treat the ~$19K/mo figure as directional only, not a verified MRR. No founder-verified revenue data is available for this app. See methodology for the formula and confidence bands.
What apps are like Human Skeleton Reference Guide?▾
Browse the full Education 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 Human Skeleton Reference Guide built with?▾
Our heuristic places Human Skeleton Reference Guide on the Native iOS (Swift / UIKit) stack (High confidence, 80%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Native iOS (SwiftUI).
Is Human Skeleton Reference Guide still actively maintained?▾
Maintenance status: Likely abandoned (95% abandonment risk). Last shipped version was 3+ years ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
When was Human Skeleton Reference Guide last updated?▾
Human Skeleton Reference Guide last shipped a new version on 2023-03-05 — more than 3 year(s) ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes Human Skeleton Reference Guide?▾
Human Skeleton Reference Guide is published by Ryan Bittorf 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 Human Skeleton Reference Guide's BU Score?▾
Human Skeleton Reference Guide 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.