JavaScript Studio Pro vs Voltage Drop Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JavaScript Studio Pro
Develop web applications on your mobile device using JavaScript, CSS, and HTML. This tool offers error checking assistance as you code, ensuring you don't lose track of your ideas. Create and save your projects anywhere, anytime.
- Write JavaScript, CSS, HTML code
- Create web applications
- Error checking assistance
- Save code and ideas
- Mobile development environment
Read full descriptionHide full description
Use your JavaScript, CSS, html skills to create apps wherever you go. These days many of us we use a smartphone anytime, as a developers sometimes we write code using some text editor to save it, for this reason I developed JavaScript Studio app a smart app that works on your phone, With JavaScript Studio you can create web apps by writing JavaScript code, CSS, Html, Html5. Error Checking? Yes, JavaScript Studio will help on it while coding by inserting a simple comment text. Never Miss any code and idea again Use JavaScript Studio Pro. ARROWAT™ JavaScript Studio Pro.
Voltage Drop Pro
Read full descriptionHide full description
Voltage Drop Pro calculates voltage drop per NEC 2023 Article 210.19 and 215.2 — the code sections that determine if your conductor run keeps voltage drop within acceptable limits. Works offline. No subscription. One-time purchase. WHAT IT CALCULATES - Branch circuits (210.19) and feeders (215.2) - Copper (K=10.4) and aluminum (K=17.0) conductors at 75°C - All wire sizes — 14 AWG through 500 kcmil - System voltages from 120V to 480V VERDICTS BACKED BY CODE Compares your voltage drop percentage against the NEC-recommended 3% branch/feeder max and 5% combined max. Get an instant PASS or FAIL — with the actual voltage drop, margin, and wire data shown. BUILT FOR THE FIELD No ads. No cloud. No account required. Designed for electricians who need the answer in seconds, not after a signup flow. PART OF THE FIELDMETRIC SUITE Also available: Box Fill Pro (NEC box fill) and Conduit Fill Pro (NEC conduit fill calculations).
Screenshots
Verdict
The clearest difference is price: Voltage Drop Pro at Free against JavaScript Studio Pro's $12.99. Voltage Drop Pro also leads on update cadence (every 3 months vs every 20 months). JavaScript Studio Pro's advantage is in-app purchases (none vs 1) and iOS requirement (10.0 vs 15.1). On ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Voltage Drop Pro is free to download; JavaScript Studio Pro costs $12.99 up front. Voltage Drop Pro sells 1 one-off in-app purchase. JavaScript Studio Pro asks for nothing beyond the download.
JavaScript Studio Pro ships an update every 20 months, Voltage Drop Pro every 3 months. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.
| Parameter | JavaScript Studio Pro | Voltage Drop Pro |
|---|---|---|
| Price | $12.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 20 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 10.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 33 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Arrowat LLC | BRUCE RAY MCCAMPBELL |
In-app purchases
JavaScript Studio Pro
No in-app purchases
Voltage Drop Pro
- Voltage Drop Pro$2.99
Questions
Is JavaScript Studio Pro free?
Is Voltage Drop Pro free?
Do JavaScript Studio Pro or Voltage Drop Pro have ads?
Which is updated more often, JavaScript Studio Pro or Voltage Drop Pro?
Other comparisons
