App Overview

Knots 3D icon

Knots 3D

Nynix · Reference

Learn over 220 knots for fishing, climbing, boating, scouting and other applications of rope work

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.9
12,706 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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A product spec, screen plans, and build steps for your coding agent.

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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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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.

App evidence

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

App Store description

Learn over 220 knots for fishing, climbing, boating, scouting and other applications of rope work. Knots 3D is the ultimate knot-tying app for fishermen, climbers, boaters and scouters alike. With over 220 unique knots and new ones added frequently, Knots 3D makes it easy to learn even the most difficult knots in no time. Browse by category or search by name, common synonym or ABoK # and save your favorite knots for quick review. Features: - 225 knots in over a dozen categories. - Completely OFFLINE and self-contained – No additional downloads or internet access required! - No ads! - 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. - Interact with the knot on the screen by "scrubbing" over the knot to advance or rewind the animation. - High-res graphics with photo-realistic rope textures. - Share a knot image and info to social media platforms, SMS text message, email, clipboard and more! - Dark mode / Light Mode - List View, Card View, and Grid View options - Create your own custom categories for grouping knots. Custom Category Ideas: "Mastered" - Track your progress, "Practice" - Select knots you want to learn next, "Top Ten" - Keep go-to knots at your fingertips. - Add personal notes directly on a knot’s detail screen including hyperlinks to external resources (YouTube, websites, tutorials, etc) - Add searchable keywords to help find knots faster - ABOK numbers for cross reference to the Ashley Book of Knots Choose from a wide variety of knots and see how they are tied in incredible detail. Each 3D knot has detailed reference information including tying pointers, strength and reliability, structural info, and Ashley reference numbers (ABoK) and the occasional history behind the knot. Categories: - Essential Knots - Arborist Knots - Boating and Sailing Knots - Camping Knots - Caving Knots - Climbing Knots - Decorative Knots - Diving Knots - Fishing Knots - Military Knots - Pioneering - Rope Care - Scouting Knots - Search and Rescue (SAR) - Theatre and Film Knots Types: - Bends - Binding Knots - Friction Hitches - Hitches - Lashings - Loop Knots - Quick Release - Stopper Knots The complete list of knots: https://knots3d.com/en/complete-list Knots 3D is the perfect app for anyone who wants to learn how to tie knots for fishing, climbing, and boating. Whether you're a beginner or an experienced knot-tyer, Knots 3D has everything you need to become an expert. Download it now and start knotting!

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Screenshots

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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.

SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
expo-three
react-navigation
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.