50
BU Score
Solid
HeartCalc
✍️ bumetric analysis
“
HeartCalc is an iOS app from Florian Schimanke in the Health & Fitness category, currently rated 5.0★ across 1 ratings. Initial signal reads as no scraped reviews yet: judgment based on metadata only.
Our BU Score puts it at 50: Solid (established niche player). For a Health & Fitness app, that means established niche player.
Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
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 (5.0★)METRIC | +$2,200 | |
| New app (9 months old)METRIC | −$700 | |
| Localized (6 languages)METRIC | +$600 | |
| Pre-traction phase (1 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 →💾 688 KB🔞 12+📱 iOS 16.6+🔖 v1.1🔄 updated 6mo ago🌐 EN, FR, DE, IT, PT +1📂 Health & Fitness💰 Paid🚀 Launched 2025 (0y old)
📝 About this app
Transform Your Training with Precision Heart Rate Zones!
Unlock your fitness potential with the most comprehensive heart rate calculator on the App Store. Whether you're a weekend warrior or elite athlete, discover your optimal training intensity for maximum results.
8 PROVEN FORMULAS
- Sally Edwards & Winfried Spanaus
- Classic Fox & Haskell formula
- Modern Tanaka & Gellish methods
- Latest Nes research (2013)
- Gender-specific Gulati & Miller formulas
COMPLETE TRAINING ZONES
Get personalized heart rate zones instantly:
- Warm-up Zone (50-60%) - Recovery & preparation… View full description on the official store →
Unlock your fitness potential with the most comprehensive heart rate calculator on the App Store. Whether you're a weekend warrior or elite athlete, discover your optimal training intensity for maximum results.
8 PROVEN FORMULAS
- Sally Edwards & Winfried Spanaus
- Classic Fox & Haskell formula
- Modern Tanaka & Gellish methods
- Latest Nes research (2013)
- Gender-specific Gulati & Miller formulas
COMPLETE TRAINING ZONES
Get personalized heart rate zones instantly:
- Warm-up Zone (50-60%) - Recovery & preparation… View full description on the official store →
🆕 What's New · v1.1
Liquid Glass for iOS 26 is here!!!
- Code optimizations
- Bug fixes
- Code optimizations
- Bug fixes
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- HeartCalc
- Developer
- Florian Schimanke
- Bundle ID
- com.flappdev.heartrater
- App Store URL
- Open in App Store
- Category
- Health & Fitness
- Content rating
- 12+
- Languages
- EN, FR, DE, IT, PT, ES
Company
- Website
- www.flappdev.com
- Tagline
- Willkommen
- 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
- $201/mo
- Top-grossing rank
- Outside top 100 in US Health & Fitness
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
- Total raised
- Not found
- Last round
- Not found
- Investors
- Not found
- Crunchbase
- Not found
- AngelList
- Not found
Press & Links
- Articles found
- Not found
- Listed on
- Not found
- Blog
- https://www.flappdev.com/index.php/impressum
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- Not found
- Phone
- Not found
- Contact page
- https://www.flappdev.com/index.php/component/dfcontact/?Itemid=8
- About page
- Not found
📈Ratings growth1 ratingsShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (10 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.
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 Florian Schimanke
View all →
Full revenue analysis
Read the article-style breakdown for HeartCalc: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.