Stark Bag
57
Quality Score
Solid
Stark Bag
Low confidence
✍️ bumetric analysis
“
Stark Bag is an iOS app from Postra AB in the Health & Fitness category, currently rated 4.8★ across 50 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Quality Score is 57: Solid (established niche player). For a Health & Fitness 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
$2.1K
per month
→
12-mo forecast
$1.8K – $6.5K
per month
→
24-mo forecast
$1.7K – $15.1K
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
$70K
↳ What it cost to build · not monthly revenue
Likely range $50K – $95K
$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 |
| ⚙ Health & Fitness complexity ×1.40 | +$20K |
Total estimate
$70K
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$2.1K/mo · ML-estimated from 234 triggers
Growth rate
+6.0% MoM · INDIE tier baseline (compound monthly)
Direction
Headwinds: rating drift may slow acquisition
6 months
$1.8K – $4.1K
12 months
$1.8K – $6.5K
24 months
$1.7K – $15.1K
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 · 44/100INDIE TIERexpected for tierRevenue Strength
3.3
Product Quality
3.9
Market Position
0.3
Growth Velocity
5.0
Defensibility
7.5
Operational Safety
7.0
Founder Strength
7.5
Monetization Maturity
1.0
- 💰 Revenue: Modest — $827 - $5169/mo · INDIE tier · medium confidence, trajectory unclear.
- ⭐ Quality: 4.84★ across 50 reviews — weak — significant quality concerns.
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: ⚠ last update 1603d ago — possibly dormant.
- ⚠️ Risk: Moderate — dormant (1603d 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 = $37K-$66K. Portfolio play ($102K/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 | |
| Excellent rating (4.8★)METRIC | +$2,200 | |
| Mature app (11y old)METRIC | +$1,500 | |
| Localized (7 languages)METRIC | +$600 | |
| Pre-traction phase (50 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.
🆕 What's New · v2.5.13
* New name
* Bugfixes
* Bugfixes
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Stark Bag
- Developer
- Postra AB
- Bundle ID
- se.virtualtrainer.VT-BULGARIANBAG
- App Store URL
- Open in App Store
- Category
- Health & Fitness
- Content rating
- 4+
- Languages
- EN, FR, DE, IT, PT, ES, SV
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
- $86/mo
- Top-grossing rank
- Outside top 100 in US Health & Fitness
- 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 growth50 ratings+4900% lifetimeShow 3-year history estimate ▾
Tracked (6 weeks) Pre-tracking estimate (37 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 app
Optimize your results with Virtual Trainer Bag!
- Be inspired by 27 exercises presented in sharp HD video.
- Create your own personal workout.
- Get a full body workout with exercises in all ranges of difficulty
- While working out, follow the step by step workout-feature which take you through the workout using timers and your chosen specifics.
- The timers support different workout types including Tabata, HIIT and Circuit training.
- Challenge yourself, get rewards and keep track of your score.
- Find exercises targeting specific muscle groups.… View full description on the official store →
- Be inspired by 27 exercises presented in sharp HD video.
- Create your own personal workout.
- Get a full body workout with exercises in all ranges of difficulty
- While working out, follow the step by step workout-feature which take you through the workout using timers and your chosen specifics.
- The timers support different workout types including Tabata, HIIT and Circuit training.
- Challenge yourself, get rewards and keep track of your score.
- Find exercises targeting specific muscle groups.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 18 MB🔞 4+📱 iOS 12.0+🔖 v2.5.13🔄 updated 0d ago🌐 EN, FR, DE, IT, PT +2📂 Health & Fitness💰 Paid
📅
What Worked™ · Development Pipeline
7 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
📈
Crossed 50 ratings — social-proof flywheel kicking in
2026-05
💲
Went paid — introduced $4.99 price point
2026-03
⭐
Rating ↑ 4.00 → 4.60 (improved 0.60★)
2026-03
📈
Crossed 10 ratings — social-proof flywheel kicking in
2020-06
⭐
Rating ↑ 3.67 → 4.00 (improved 0.33★)
2018-04
⭐
Rating ↓ 5.00 → 3.67 (dropped 1.33★)
2017-07
🚀
First tracked snapshot — initial data captured
🔔
Track this app’s revenue
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📝 Description
95
BU Score · Transcendent
More by Postra AB
View all →📦 Portfolio summaryMID studio
10apps·$102K/mocombined
✓ Diversified — top app contributes 27%; risk spread across portfolio
About this analysis
Why low confidence: only 50 ratings · no founder-verified revenue (model estimate only) · revenue figure is directional only.
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Stark Bag make per month?▴
Based on our ML-calibrated revenue forecast, Stark Bag earns approximately $86/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.
What apps are like Stark Bag?▴
Browse the full Health & Fitness 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.
Who makes Stark Bag?▴
Stark Bag is published by Postra AB 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 Stark Bag's BU Score?▴
Stark Bag has a BU Score of 57/100 (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.