53
BU Score
Solid
Roman Calculator
✍️ bumetric analysis
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Roman Calculator is an iOS app from John Millhouse in the Productivity category, currently rated 5.0★ across 4 ratings. Initial signal reads as mixed reviews: supporters praise core features while critics cite stability and value gaps.
Our BU Score puts it at 53: Solid (established niche player). For a Productivity 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
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Reviews
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Forecast Revenue / mo
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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 ($0.99)METRIC | +$2,800 | |
| Excellent rating (5.0★)METRIC | +$2,200 | |
| Mature app (15y old)METRIC | +$1,500 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (4 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.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →💾 38 MB🔞 4+📱 iOS 26.0+🔖 v26.2🔄 updated 6mo ago🌐 EN📂 Productivity💰 Paid🚀 Launched 2011 (15y old)
📝 About this app
Roman Calculator is a full function calculator and the first to calculate roman fractions. Choose from four backgrounds including your image library and four button style. Styles are selectable in settings or can be set with a swipe. The result of all calculations will be displayed as a roman number. Tap the Convert button to convert Roman to Arabic and visa versa. In landscape mode, both roman numbers and arabic numbers are displayed. Landscape mode also adds more functions. The functions include sin, cos, tan, square root, inverse, memory and more.
🆕 What's New · v26.2
Updated button design and animation.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Roman Calculator
- Developer
- John Millhouse
- Bundle ID
- com.MillhouseEngineering.RomanCalc
- App Store URL
- Open in App Store
- Category
- Productivity
- Content rating
- 4+
- Languages
- EN
Company
- Website
- millhouseengineering.wordpress.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
- $86/mo
- Top-grossing rank
- Outside top 100 in US Productivity
- 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
- Not found
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- Not found
- Phone
- Not found
- Contact page
- Not found
- About page
- Not found
⭐Recent App Store Reviews4 latest · avg 4.0★ · 75.0% 5★ · 25.0% 1★
5★3 (75%)
4★0 (0%)
3★0 (0%)
2★0 (0%)
1★1 (25%)
+0 ratings/week
Praise: great ×1Complaints: crash ×1 hate ×1
Top positive
★★★★★ My main calculator app
I don't understand the negative comment. I use the Roman Calc all the time and never had a crash. My background and button styles stay set from launch to launch.…
★★★★★ Fun!! Fun!! Fun!!
This is not only a BLAST! But truly simple and useful. I really don't take the time to write comments, but this was just too good to let pass without letting others know about it.…
Top negative
★☆☆☆☆ Hate it
I hate this app don't get it when ever you use it more than once. It just takes u back to the main home page…
★★★★★ My main calculator app
I don't understand the negative comment. I use the Roman Calc all the time and never had a crash. My background and button styles stay set from launch to launch.…
📈Ratings growth4 ratings+300% 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.
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.
Full revenue analysis
Read the article-style breakdown for Roman Calculator: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.