53
Quality Score
Solid
DroneTone Concertmaster
Low confidence
✍️ bumetric analysis
“
DroneTone Concertmaster is an iOS app from James Roberts in the News category, currently rated 3.8★ across 11 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Quality Score is 53: Solid (established niche player). For a News 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.
💰 Monthly revenue · now vs forecast
● Right now
$1.8K
per month
→
12-mo forecast
$1.5K – $5.5K
per month
→
24-mo forecast
$1.4K – $12.8K
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
$100K
↳ What it cost to build · not monthly revenue
Likely range $75K – $135K
$25K · MVP floor$100K · indie scale$500K+ · studio build
📈Pays back in ~9 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 |
| 📦Asset bundle (86 MB) | +$14K |
| ⚙News complexity ×1.20 | +$12K |
| ⚙3.4y maintenance × ~1-person team | +$20K |
Total estimate$100K
ONE-TIME · EXIT VALUE💵 Estimated acquisition value
$150K
↳ What it would sell for · not monthly revenue
Marketplace range $125K – $200K · 14× MRR multiple
💸~1.5× build cost (break-even+)
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 |
| 📅3.4y proven track record | +17% |
| ⭐★ rating 3.5-4.0 (mixed) | -8% |
| 🏷News category multiple | -5% |
| ⭐Small user base (<1K ratings) | -8% |
Final multiple14× MRR
🛠 Estimated tech stack
🍎
Native iOS (SwiftUI)
Medium confidence · 60%
Also possible
React NativeFlutter
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 | 86 MB |
| 🏷Category context | News |
| 📦Mid-large iOS bundle | → Likely native SwiftUI (post-2020 era) |
💀 Maintenance status
Likely abandoned
82%
Last shipped 2024-10-07 · 595 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
| 📅1y 7mo since last update | Likely deprioritized |
| 👥Small user base (11 ratings) + 3.4y old | +10% (solo-project pattern) |
VerdictLikely abandoned
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$1.8K/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
Direction
Headwinds: rating drift may slow acquisition, low defensibility moat
6 months
$1.5K – $3.5K
12 months
$1.5K – $5.5K
24 months
$1.4K – $12.8K
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 · 36/100INDIE TIERlimited signalGrowth Velocity
5.0
Founder Strength
5.0
Product Quality
3.1
Revenue Strength
3.2
Monetization Maturity
1.0
Defensibility
2.9
Market Position
2.0
Operational Safety
7.0
- 💰 Revenue: Modest — $703 - $4394/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 3.82★ across 11 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 595d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (595d 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 = $31K-$56K. Portfolio play ($11K/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 5 of 5 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 | |
| Established app (3y old)METRIC | +$800 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (11 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 →💾 86 MB🔞 4+📱 iOS 12.0+🔖 v2.2.1🔄 updated 1y ago🌐 EN📂 News💰 Paid🚀 Launched 2022 (3y old)
📝 About this app
Drone Tone Tool is an app created by professional musicians and music educators providing high quality reference pitches with the rich overtones of real cellos. We encourage musicians of all abilities to experience the benefits of reference tone practice!
Why real cello drones?
There are many electronic tone generators, and while they are better than nothing, they lack complexity of overtones and can be painful to listen to. Our cello drones are pleasing to the ear, rich in overtones and contain layered octaves to facilitate practice in all registers.… View full description on the official store →
Why real cello drones?
There are many electronic tone generators, and while they are better than nothing, they lack complexity of overtones and can be painful to listen to. Our cello drones are pleasing to the ear, rich in overtones and contain layered octaves to facilitate practice in all registers.… View full description on the official store →
🆕 What's New · v2.2.1
Resolved an issue where the app would not produce sound while the silent switch was on. Tones will now play even when the silent switch is on!
📅
What Worked™ · Development Pipeline
6 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 →
2026-03
⭐
Rating ↑ 3.63 → 4.70 (improved 1.07★)
2026-03
📈
Crossed 10 ratings — social-proof flywheel kicking in
2025-01
⭐
Rating ↑ 3.00 → 3.50 (improved 0.50★)
2024-10
⭐
Rating ↑ 2.50 → 3.00 (improved 0.50★)
2024-09
⭐
Rating ↑ 1.00 → 2.50 (improved 1.50★)
2024-04
🚀
First tracked snapshot — initial data captured
🧪
Tech & Domain Intel — dronetonetool.com
- Tech stack
- Google Workspace · SendGrid
Derived from public RDAP + DNS TXT records (no scraping, no login).
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 3★ | 4 | 3★ this version |
| 🇧🇷 BR | 1★ | 1 | 1★ this version |
| 🇨🇦 CA | 2.33333★ | 3 | 2.33333★ this version |
| 🇩🇪 DE | 4.66667★ | 3 | 4.66667★ this version |
| 🇫🇷 FR | 5★ | 2 | 5★ this version |
| 🇬🇧 GB | 2.75★ | 4 | 2.75★ this version |
| 🇮🇳 IN | 0★ | 0 | — |
| 🇯🇵 JP | 0★ | 0 | — |
| 🇺🇸 US | 3.81818★ | 11 | 3.81818★ this version |
🔔
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Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- DroneTone Concertmaster
- Developer
- James Roberts
- Bundle ID
- com.tuningtoolbox.dronetonetoolpaid
- App Store URL
- Open in App Store
- Category
- News
- Content rating
- 4+
- Languages
- EN
Company
- Website
- Not found
- Tagline
- Drone Tone Tool
- Description
- High quality reference pitches with the rich sounds of real cello. Created by professional musicians and music educators, we encourage musicians of all abilities to experience the benefits of reference tone practice.
- 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
- $11.1K/mo
- Top-grossing rank
- Outside top 100 in US News
- 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.
⭐Recent App Store Reviews8 latest · avg 3.62★ · 37.5% 5★ · 12.5% 1★
5★3 (38%)
4★2 (25%)
3★1 (12%)
2★1 (12%)
1★1 (12%)
+0 ratings/week
Praise: great ×3 perfect ×2 love ×1
Top positive
★★★★★ Helps with scale practice
Works great. I bought it to practice three octave scales on my Violin. Helps me hear my intonation better. Sometimes practicing alone I feel “lost in the wilderness” up in the high registers; there is nothing to compare to. If I’m sharp on …
★★★★★ Ideal 🎶
Perfect way to practice intonation—I play pedal steel guitar—and rhythm at the same time. Not intended for songwriting or making soundtracks, though you can work on modes, etc. It’s nice that you can balance click & tone volumes.…
Top negative
★☆☆☆☆ Does l not work on latest iOS 17.4.1
Does l not work on latest iOS 17.4.1…
★★☆☆☆ Pitch control not useful.
Having pitch control of 440, 441 and 442 is fine but should be stated before dropping money on an app. I play historical instruments so 415, 392 and other pitches are needed.…
📈Ratings growth11 ratings+267% lifetimeShow 3-year history estimate ▾
Tracked (10 weeks) Pre-tracking estimate (35 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.
About this analysis
Why low confidence: only 11 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
📌 Final verdict — read this before you trust the numbers above
DroneTone Concertmaster is a early-stage iOS app in the news space with weak public traction — only 11 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.
Bottom line: treat all revenue, audience and acquisition-value numbers on this page as directional only — not founder-verified facts.
❓ Frequently Asked Questions
7 answers · auto-generated from this app's public dataHow much does DroneTone Concertmaster make per month?▴
Our model estimates DroneTone Concertmaster earns roughly $11K/mo, but with only 11 ratings the confidence interval is wide. No founder-verified MRR is available for this app, so this is a model output calibrated against comparable apps in the same category. See methodology for the formula.
What apps are like DroneTone Concertmaster?▴
Browse the full News 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 DroneTone Concertmaster built with?▴
Our heuristic places DroneTone Concertmaster on the Native iOS (SwiftUI) stack (Medium confidence, 60%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: React Native, Flutter.
Is DroneTone Concertmaster still actively maintained?▴
Maintenance status: Likely abandoned (82% abandonment risk). Last shipped version was 1+ years ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
When was DroneTone Concertmaster last updated?▴
DroneTone Concertmaster last shipped a new version on 2024-10-07 — more than 1 year(s) ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes DroneTone Concertmaster?▴
DroneTone Concertmaster is published by James Roberts 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 DroneTone Concertmaster's BU Score?▴
DroneTone Concertmaster 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.