App Overview

Knots 3D icon

Knots 3D

Nynix · Reference

Learn to tie over 240 knots for fishing, climbing, boating, sailing, camping, scouting and other ropework.

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
13,011 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Knots 3D: map the core Reference workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Learn to tie over 240 knots for fishing, climbing, boating, sailing, camping, scouting and other ropework. Knots 3D is the original 3D knot-tying app, first released in 2011 and rated 4.9 by tens of thousands of users worldwide. Choose a knot app with care, as your safety may depend on it. Watch each knot tie itself in 3D, slow it down, and turn it around until it makes sense. Browse by category or type, search by name, common synonym or Ashley Book of Knots (ABoK) number, or describe what you need the knot to do. Save your favorite knots for quick review. Features: - 241 knots in over a dozen categories, with new knots added regularly - No ads, no subscriptions and no in-app purchases. Ever! - Completely OFFLINE and self-contained. No additional downloads or internet access required! - Watch knots tie themselves and pause or adjust the speed of the animation at any time - Rotate knots in 360-degree, 3D views to study them from any angle with a swipe of a finger - "Scrub" over the knot with a finger to advance or rewind the animation - Mirror (left-hand) mode, zoom, and rotate the view to match how you hold the rope - Describe a task in your own words, like "tie a boat to a dock", to find the right knots for the job - High-res graphics with photorealistic rope textures - Dark mode and light mode - List, Card and Icon view options - Create your own custom categories to group knots, such as "Mastered", "Practice" or "Top Ten" - Add personal notes, links and your own search keywords to any knot - Share a knot link by text message, email, social media and more - ABoK numbers for cross-reference to The Ashley Book of Knots Includes the knots people look for most: Bowline, Clove Hitch, Figure Eight, Trucker's Hitch, Square Knot, Sheet Bend, Prusik, Taut Line Hitch, Cleat Hitch, Palomar Knot, Uni Knot, Double Fisherman's Knot, Alpine Butterfly, Monkey's Fist, Munter Hitch and many more. Every knot comes with a description of what it is for and a list of common uses. Most also include the other names the knot goes by, strength and reliability notes, structure, related knots, ABoK numbers and history. Available in 25 languages: Arabic, Chinese (Simplified), Chinese (Traditional), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Turkish, Ukrainian and Vietnamese Categories: - Essential Knots - Arborist - Boating - Camping - Caving - Climbing - Decorative - Diving - Fire & Rescue - Fishing - Military - Neckties - Pioneering - Rope Care - Scouting - Theatre & Film Types: - Bends - Binding - Coils - Friction Hitches - Hitches - Lashings - Loops - Mats - Multi-Loop - Quick Release - Stoppers - Whippings The complete list of knots: https://knots3d.com/en/complete-list Missing a knot? Suggest one from inside the app. Knots 3D is a learning reference. Learn from a skilled instructor if you plan to use ropes or knots in a situation where failure could cause property damage, injury, or death.

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Expand the knot library with user-generated content.

Assumption to check: Limited knot categories and styles available

Validate with people who use this workflow before building.

Hypothesis 2

Enhance 3D animations for better understanding.

Assumption to check: Difficult to visualize complex knots

Validate with people who use this workflow before building.

Hypothesis 3

Simplify subscription options and clarify benefits.

Assumption to check: In-app purchases can be confusing

Validate with people who use this workflow before building.

Hypothesis 4

Streamline navigation and improve layout.

Assumption to check: User interface feels cluttered

Validate with people who use this workflow before building.

Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.