50
BU Score
Solid
Four To Twenty: mA/V Converter
✍️ bumetric analysis
“
Four To Twenty: mA/V Converter is an iOS app from Jon Giambattista in the Utilities category, currently rated 4.5★ across 10 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Our BU Score puts it at 50: Solid (established niche player). For a Utilities 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
Loading…
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 ($0.99)METRIC | +$2,800 | |
| Excellent rating (4.5★)METRIC | +$2,200 | |
| Mature app (8y old)METRIC | +$1,500 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (10 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 →💾 14 MB🔞 4+📱 iOS 10.2+🔖 v2.0🔄 updated 5y ago🌐 EN📂 Utilities💰 Paid🚀 Launched 2017 (8y old)
📝 About this app
A simple calculator for converting electrical signals, typically 4-20mA scaled to an appropriate process signal (ex: 0-1000 psi).
Choose from a wide variety of preset signal inputs and process signal outputs or enter your own custom values.
Choose from 8 different themes.
Choose from a wide variety of preset signal inputs and process signal outputs or enter your own custom values.
Choose from 8 different themes.
🆕 What's New · v2.0
Added support for negative numbers.
Choose from 8 different themes.
Fixed an issue with comma decimal point calculations.
Choose from 8 different themes.
Fixed an issue with comma decimal point calculations.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Four To Twenty: mA/V Converter
- Developer
- Jon Giambattista
- Bundle ID
- com.JonGiambi.FourToTwenty
- App Store URL
- Open in App Store
- Category
- Utilities
- Content rating
- 4+
- Languages
- EN
Company
- Website
- fourtotwenty.carrd.co
- 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
- $201/mo
- Top-grossing rank
- Outside top 100 in US Utilities
- 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 Reviews2 latest · avg 4.5★ · 50.0% 5★ · 0% 1★
5★1 (50%)
4★1 (50%)
3★0 (0%)
2★0 (0%)
1★0 (0%)
+0 ratings/week
Praise: great ×1 fantastic ×1
Top positive
★★★★☆ Simple and easy
I think it would be helpful if you added the math formula with it.…
★★★★★ Great App!
This app is fantastic!
Wonder what your thoughts are on adding what the 0-100% value would be.
Ex: 0-100•c 16mA would be 75%. This example is very easy but say we’re looking for 42% of the range. Hope this makes sense.…
Top negative
★★★★☆ Simple and easy
I think it would be helpful if you added the math formula with it.…
★★★★★ Great App!
This app is fantastic!
Wonder what your thoughts are on adding what the 0-100% value would be.
Ex: 0-100•c 16mA would be 75%. This example is very easy but say we’re looking for 42% of the range. Hope this makes sense.…
📈Ratings growth10 ratings+900% lifetimeShow 3-year history estimate ▾
Tracked (4 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.
More by Jon Giambattista
View all →
Full revenue analysis
Read the article-style breakdown for Four To Twenty: mA/V Converter: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.