50
Quality Score
Solid
Piano MIDI Legend
Why medium confidence: 630 ratings · no founder-verified revenue (model estimate only).
✍️ bumetric analysis
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Piano MIDI Legend is an Android app from ROCKRELAY APPS in the Music & Audio category, currently rated 3.6★ across 630 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Quality Score is 50: Solid (established niche player). For a Music & Audio 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
$500/mo
In 12 months
$437 – $1575
In 24 months
$405 – $3644
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
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD💰 Estimated build cost
$180K
↳ What it cost to build · not monthly revenue
Likely range $135K – $245K
$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 |
| 💎In-app purchase plumbing | +$9K |
| ⚙Music & Audio complexity ×1.45 | +$26K |
| 🌐Cross-platform reach (iOS + Android) | +$47K |
| ⚙8.0y maintenance × ~1-person team | +$48K |
Total estimate$180K
👥 Estimated audience size
57K
Lifetime downloads (US-equivalent)
Monthly active
7.2K
Daily active
3.6K
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
| 📲Music & Audio engagement | ~130 installs / rating |
| 📅8.0y of rating accumulation | -30% |
| 🔁Music & Audio D30 retention | 20% |
| 📍DAU / MAU stickiness | 0.50 |
DAU / MAU50% sticky
🛠 Estimated tech stack
🤖
Native Android (Kotlin)
High confidence · 80%
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 | Music & Audio |
| 📦Compact Android bundle | → Native Kotlin |
🔬
How we forecast this revenue
LOW CONFIDENCEBaseline
$500/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
6 months
$426 – $993
12 months
$437 – $1.6K
24 months
$405 – $3.6K
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
Early-stage solo · 40/100INDIE TIERexpected for tierGrowth Velocity
5.0
Founder Strength
5.0
Product Quality
5.2
Revenue Strength
2.7
Monetization Maturity
1.0
Defensibility
3.5
Market Position
0.0
Operational Safety
10.0
- 💰 Revenue: Marginal — $200 - $1250/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 3.7★ across 443 reviews — below category median.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: Insufficient signal to assess trajectory.
- ⚠️ Risk: Low — 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 = $9K-$16K. Portfolio play ($1K/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:
| Mature app (8y old)METRIC | +$1,500 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Early-stage install base (630 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 →🔖 vVaries with device📂 Music & Audio💰 Free📺 Ad-supported💎 IAP $9.99 per item🚀 Launched 2018 (8y old)
📝 About this app
Well, this Piano is a LEGEND!
The best virtual keyboard available for android. Supports different key sizes, full 88 keys, 7 octaves, slide play, 2 rows keyboard with custom key sizes.The best MIDI keyboard support via OTG USB cable and Bluetooth (BTLE) MIDI controllers.The best zero latency sound available for android. Perfect piano, strings, synths, keys, organ, guitar. PCM/AWM2 quality samples. Excellent MIDI implementation. Pitchbend, sustain pedal, octave buttons and 432 Hz tuning.
Midi Volume at CC#7
Reverb FX at CC#91
Delay FX at CC#92… View full description on the official store →
The best virtual keyboard available for android. Supports different key sizes, full 88 keys, 7 octaves, slide play, 2 rows keyboard with custom key sizes.The best MIDI keyboard support via OTG USB cable and Bluetooth (BTLE) MIDI controllers.The best zero latency sound available for android. Perfect piano, strings, synths, keys, organ, guitar. PCM/AWM2 quality samples. Excellent MIDI implementation. Pitchbend, sustain pedal, octave buttons and 432 Hz tuning.
Midi Volume at CC#7
Reverb FX at CC#91
Delay FX at CC#92… View full description on the official store →
🔔
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Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Piano MIDI Legend
- Developer
- ROCKRELAY APPS
- Bundle ID
- com.rockrelay.piano
- App Store URL
- Open in App Store
- Category
- Music & Audio
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- www.rockrelay.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
- $380/mo
- Top-grossing rank
- Not found
- All-time revenue
- Not found
- Pricing
- $9.99 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 growth630 ratings+23% lifetimeShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (35 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.
Similar apps in Music & Audio
Full revenue analysis
Read the article-style breakdown for Piano MIDI Legend: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
❓ Frequently Asked Questions
7 answers · auto-generated from this app's public dataHow much does Piano MIDI Legend make per month?▾
Based on our ML-calibrated revenue forecast, Piano MIDI Legend earns approximately $379/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 Piano MIDI Legend profitable?▾
With estimated build cost $180K and monthly revenue $379, Piano MIDI Legend looks well below break-even — current monthly revenue is much smaller than the estimated build cost. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
How many users does Piano MIDI Legend have?▾
Estimated audience: ~57K lifetime downloads, ~7K monthly active users, and ~3K 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 Piano MIDI Legend?▾
Browse the full Music & Audio 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 Piano MIDI Legend built with?▾
Our heuristic places Piano MIDI Legend on the Native Android (Kotlin) stack (High confidence, 80%). Signals: app bundle size, category context, store-description markers, release-date era. We don't disassemble binaries. Alternative possibilities: Flutter.
Who makes Piano MIDI Legend?▾
Piano MIDI Legend is published by ROCKRELAY APPS 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 Piano MIDI Legend's BU Score?▾
Piano MIDI Legend has a BU Score of 50/100 (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.