Comparison

Promark VR vs Dock Line Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Promark VR

Control a toy quadrocopter via Wi-Fi with real-time video streaming. This application enables seamless piloting and visual feedback from your drone.

Highlights
  • Wi-Fi quadrocopter control
  • Real-time video transfer
  • Drone piloting
  • Live video feed
Features
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A toy quadrocopter control by wifi with video transfer real time. Support iOS 7 ,iOS 8, iOS 9,iPhone 5 ,iPhone 5c,iPhone 5s, iPhone 6, iPhone 6 plus, iPhone 6s, iPhone 6s plus

About

Dock Line Calculator

Features
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Dock Line Calculator is a mooring layout studio for boat owners. Draw your boat at its berth, set where each dock line attaches, measure each line on the real boat and keep the whole plan in one place. HOW IT WORKS 1. Vessel: enter length overall, beam, bow freeboard and cleat positions once. 2. Berth Layout: choose alongside dock, finger pier, slip, stern-to or your own arrangement, and the dock side. 3. Line Plan: tap a line on the drawing or in the list, choose where it attaches, enter your own measurements and mark it verified once you have checked it on the boat. 4. Rope Inventory: enter the rope you already own, add a waste allowance and see what is left to buy. 5. Export: share the plan as text, PDF or CSV. WHAT YOU GET - A top-down drawing of your boat at the dock. No dragging needed: attachment points are chosen from lists and the drawing follows. - Bow, stern and spring lines with rule-of-thumb starting lengths and diameters (the same figures as earlier versions). - Every length shows where it came from: rule of thumb, geometry estimate, measured by you or adjusted by you. The app never replaces a length you entered. - A chafe and movement checklist for the real berth: chafe protection, cleats, fenders, tidal range, line lead, expected movement and marina or manufacturer requirements. - Several vessels and plans, with side-by-side plan comparison. - Anchor snubber and bridle leg figures from your bow freeboard and beam. - Feet or metres. Light and dark appearance. iPhone and iPad. - Offline. No account. Your data stays on your device. IMPORTANT Dock Line Calculator gives rule-of-thumb starting points and records your own measurements. It is not an engineering standard, it does not state breaking strength, it does not say a line is strong enough and it does not certify a mooring as safe. Your rope maker, your marina, your insurer and a competent marine professional come first. FREE AND PRO Free: the basic dock-line figures, the mooring studio with the standard lines of one plan, your own measurements, the chafe and movement checklist, one saved vessel and text sharing. Pro (one-time purchase, no subscription): more vessels and plans, plan comparison, snubber and bridle figures, rope inventory and shopping list, additional custom lines, PDF and CSV export. Restore Purchases is always available. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.termsfeed.com/live/fb476ff2-3dfa-4504-ad15-d0886dc45a6d

Screenshots

Promark VR4 screens
Dock Line Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: Promark VR at none against Dock Line Calculator's 1. Promark VR also leads on iOS requirement (12.0 vs 16.4). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Dock Line Calculator sells 1 one-off in-app purchase. Promark VR asks for nothing beyond the download.

UpkeepUpdate frequency

Promark VR ships an update monthly, Dock Line Calculator every 2 months. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

Scorecard2 real differences · 8 level
Promark VR versus Dock Line Calculator: the parameters behind the verdict, then further details
ParameterPromark VRDock Line Calculator
PriceFreeFree
Rating3.1 (55 ratings) — better—
Positive reviews14.3% of reviews—
Number of ratings55 — better—
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better16.4
Further details — not scored
Size32 MB2 MB
Age rating4+4+
DeveloperShanTou City Vison Electronictechnology Co., Ltd.EVREN YUCEBAS

In-app purchases

None

Promark VR

No in-app purchases

1 purchases

Dock Line Calculator

One-time1
  • Dock Line Calculator Pro$4.99

Questions

Is Promark VR free?
Promark VR is free to download, with no in-app purchases.
Is Dock Line Calculator free?
Dock Line Calculator is free to download, with in-app purchases available.
Do Promark VR or Dock Line Calculator have ads?
Neither Promark VR nor Dock Line Calculator shows ads.
Which is updated more often, Promark VR or Dock Line Calculator?
Promark VR ships an update monthly, and Dock Line Calculator every 2 months. Most recently, Promark VR was updated on November 6, 2026 and Dock Line Calculator on November 10, 2026.

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