RacquetTune - String Tension
60
Quality Score
Solid
✍️ Bumetric analysis
“
RacquetTune - String Tension is an iOS app from Sten Kaiser, currently rated 4.6★ across 480 ratings. Initial signal reads as no scraped reviews yet: judgment based on metadata only.
Quality Score is 60: Solid (established niche player). For an app like this, 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
$5.0K
per month
→
12-mo forecast
$5.2K – $10.8K
per month
→
24-mo forecast
$6.4K – $19.2K
per month
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
3 snapshots on record
Rating
4.6
Reviews
480 reviews
Forecast Revenue / mo
$5.0K
Snapshots tracked
3
since Jul 2026
ONE-TIME · BUILD
💰 Estimated build cost
$150K
↳ What it cost to build · not monthly revenue
Likely range $110K – $200K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~2.5y 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 |
| ⚙ 16.5y maintenance × ~1-person team | +$98K |
Total estimate
$150K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$100K
↳ What it would sell for · not monthly revenue
Marketplace range $75K – $125K · 18× MRR multiple
💸
~0.7× 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 |
| 📅 16.5y proven track record | +20% |
| ⭐ ★ rating ≥ 4.4 (solid) | +8% |
| ⭐ Small user base (<1K ratings) | -8% |
Final multiple
18× MRR
👥 Estimated audience size
50K
Lifetime downloads (US-equivalent)
Monthly active
1.5K
Daily active
300
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
| 📲 category engagement | ~150 installs / rating |
| 📅 16.5y of rating accumulation | -30% |
| 🔁 category D30 retention | 15% |
| 📍 DAU / MAU stickiness | 0.20 |
DAU / MAU
20% sticky
🛠 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 | 11 MB |
| 🏷 Category context | category |
| 📦 Compact iOS bundle | → Native Swift / UIKit (pre-2020 era) |
💀 Maintenance status
At risk
60%
Last shipped 2026-04-02 · 185 days ago
0 · Active
50 · At risk
100 · 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
| 📅 6 months since last update | Concerning gap |
| 👥 Small user base (480 ratings) + 16.5y old | +10% (solo-project pattern) |
Verdict
At risk
🔬
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)
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 · 52/100MID TIERunderperforming peersGrowth Velocity
5.0
Founder Strength
6.8
Product Quality
6.5
Revenue Strength
3.7
Monetization Maturity
1.0
Defensibility
7.5
Market Position
2.0
Operational Safety
9.0
- 💰 Revenue: Modest — $3K - $7K/mo · MID tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.63★ across 480 reviews — solid.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: last update 181d ago — slow cadence.
- ⚠️ 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 = $90K-$160K. Portfolio play ($21K/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 ($2.99)METRIC | +$2,800 | |
| Excellent rating (4.6★)METRIC | +$2,200 | |
| Mature app (16y old)METRIC | +$1,500 | |
| Early-stage install base (480 ratings)METRIC | +$400 | |
| Single-language (English only)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.
🆕 What's New · v7.7
- Fixed the problem with detecting sound on iOS 26.4 and later.
- Fixed an issue with contributing strings to the online database.
- Fixed an issue with contributing strings to the online database.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- RacquetTune - String Tension
- Developer
- Sten Kaiser
- Bundle ID
- racquetTune
- App Store URL
- Open in App Store
- Category
- Not found
- Content rating
- 4+
- 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
- Reported revenue signal / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- Model estimate / mo
- $5.0K/mo
- Top-grossing rank
- Outside top 100 in US
- 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.
🌍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.
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
Listen to your racquet and perfect your game!
RacquetTune ensures that your racquet is ideally suited to your style of play. Simple and straightforward to use, the app uses the sound generated by tapping the strings to calculate the tension with high accuracy. In addition, the interactive swingweight calculator aids in customizing your racquet to fit your own stroke pattern, while the stiffness calculator allows you to simulate different racquet configurations.… View full description on the official store →
RacquetTune ensures that your racquet is ideally suited to your style of play. Simple and straightforward to use, the app uses the sound generated by tapping the strings to calculate the tension with high accuracy. In addition, the interactive swingweight calculator aids in customizing your racquet to fit your own stroke pattern, while the stiffness calculator allows you to simulate different racquet configurations.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 11 MB🔞 4+📱 iOS 12.0+🔖 v7.7🔄 updated 6mo ago🌐 EN💰 Paid🚀 Launched 2010 (16y old)
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 4.82★ | 50 | 4.82★ this version |
| 🇧🇷 BR | 4.78049★ | 41 | 4.78049★ this version |
| 🇨🇦 CA | 4.51667★ | 60 | 4.51667★ this version |
| 🇩🇪 DE | 4.60304★ | 131 | 4.60304★ this version |
| 🇫🇷 FR | 4.52174★ | 23 | 4.52174★ this version |
| 🇬🇧 GB | 4.55556★ | 45 | 4.55556★ this version |
| 🇮🇳 IN | 3.5★ | 4 | 3.5★ this version |
| 🇯🇵 JP | 4.51538★ | 260 | 4.51538★ this version |
| 🇺🇸 US | 4.62448★ | 482 | 4.62448★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for RacquetTune - String Tension: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
More by Sten Kaiser
View all →📦 Portfolio summaryINDIE studio
6apps·$30K/mocombined
✓ Diversified — top app contributes 17%; risk spread across portfolio
About this analysis
Why medium confidence: 480 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
9 answers · auto-generated from this app's public dataHow much does RacquetTune - String Tension make per month?▴
Based on our ML-calibrated revenue forecast, RacquetTune - String Tension earns approximately $5.0K/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.
Is RacquetTune - String Tension profitable?▴
With estimated build cost $150K and monthly revenue $5.0K, RacquetTune - String Tension looks break-even-grade — payback period sits around 2.5 years. Profitability also depends on paid-acquisition spend and refund rate which the public model doesn't see.
How many users does RacquetTune - String Tension have?▴
Estimated audience: ~50K lifetime downloads, ~1K monthly active users, and ~300 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 is RacquetTune - String Tension built with?▴
Our heuristic places RacquetTune - String Tension 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 RacquetTune - String Tension still actively maintained?▴
Maintenance status: At risk (60% abandonment risk). Last shipped version was 6 months ago. The risk score combines time-since-last-update with Editor's Choice / curated featuring + user-base maturity adjustments.
How much would RacquetTune - String Tension sell for?▴
Estimated acquisition value: $100K (marketplace range $75K – $125K). Calculated as 18× monthly revenue using the standard multiple for the detected monetization model + adjustments for age, rating quality and category demand. Calibrated against 2024-2026 Flippa / Acquire.com / MicroAcquire closed-deal medians.
When was RacquetTune - String Tension last updated?▴
RacquetTune - String Tension last shipped a new version on 2026-04-02 — 6 months ago. This is the date Apple / Google last accepted a new build, not a content-only push.
Who makes RacquetTune - String Tension?▴
RacquetTune - String Tension is published by Sten Kaiser 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 RacquetTune - String Tension's BU Score?▴
RacquetTune - String Tension has a BU Score of 60/100 (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.