Trajectory vs LineConstants
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trajectory
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Detects the trajectories of shapes moving along a parabolic path
LineConstants
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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/
Screenshots
Verdict
The clearest difference is in-app purchases: Trajectory at none against LineConstants's 2. Trajectory also leads on update cadence (fortnightly vs every 2 months). LineConstants's advantage is ads (none vs shown). On price, device support and iOS requirement 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. Trajectory asks for nothing beyond the download.
Trajectory ships an update fortnightly, LineConstants every 2 months. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.
| Parameter | Trajectory | LineConstants |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.7.2 — better | 18.0 |
| Further details — not scored | ||
| Size | 36 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideaki Uchikoshi | Sergey Gussev |
In-app purchases
Trajectory
No in-app purchases
LineConstants
- Monthly$9.991 Month
- Yearly$19.991 Year
Questions
Is Trajectory free?
Is LineConstants free?
Do Trajectory or LineConstants have ads?
Which is updated more often, Trajectory or LineConstants?
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