LineConstants vs PQDIF Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LineConstants
Read full descriptionHide full description
LineConstants is a professional tool for calculating the parameters of overhead (OHL) and cable (CL) power transmission lines. This app is ideal for engineers, designers, energy specialists, and technical students. Key Features: Fast and accurate calculation of resistances and admittances for both OHL and CL Multi-section line modeling with multiple circuits Support for split conductors and grounding configurations Cable modeling with core arrangement and screen grounding Comprehensive built-in directories: supports, conductors, cables, ground wires, insulators, soil types, and voltage classes Export results to PDF and share with other apps Flexible language settings, frequency selection, and temperature adjustments LineConstants is built for professionals who demand accuracy, efficiency, and control. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
PQDIF Viewer
Read full descriptionHide full description
PQDIF Viewer is a simple to use tool to chart Power Quality data in PQD files (IEEE 1159.3-2025). Open files from Mail, Files, or AirDrop, or tap the bundled sample to try it out. Built for power system engineers who need to inspect data on the go.
Screenshots
Verdict
The clearest difference is in-app purchases: PQDIF Viewer at none against LineConstants's 2. PQDIF Viewer also leads on update cadence (every 3 days vs every 2 months) and iOS requirement (15.6 vs 18.0). On price, 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
Both are free to download. LineConstants sells 2 in-app purchases, starting at $9.99 per month. PQDIF Viewer asks for nothing beyond the download.
LineConstants ships an update every 2 months, PQDIF Viewer every 3 days. The most recent releases landed on September 12, 2026 and September 21, 2026 respectively.
| Parameter | LineConstants | PQDIF Viewer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 33 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Sergey Gussev | Russell Patterson |
In-app purchases
LineConstants
- Monthly$9.991 Month
- Yearly$19.991 Year
PQDIF Viewer
No in-app purchases
Questions
Is LineConstants free?
Is PQDIF Viewer free?
Do LineConstants or PQDIF Viewer have ads?
Which is updated more often, LineConstants or PQDIF Viewer?
Other comparisons
