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.
App Overview
Animated Knots by Grog
Learn to tie knots (195+ knots) the fun and easy way from the creators of the web's #1 knot tying site
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
336 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included18 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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Animated Knots by Grog: 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
Create a more intuitive category filtering system.
Assumption to check: Limited knot categories can make navigation cumbersome.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate guided tutorials with user interaction.
Assumption to check: App lacks interactive tutorials for tying knots.
Validate with people who use this workflow before building.
Hypothesis 3
Add a feature for users to submit their own knots.
Assumption to check: No user-generated content or community features.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a clearer paywall with trial options.
Assumption to check: In-app purchases can be unclear to users.
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 to tie knots (195+ knots) the fun and easy way from the creators of the web's #1 knot tying site. Animated Knots by Grog is simply the best, most comprehensive teaching & reference app for climbers, boaters, sailors, fishermen, scouts, arborists, search & rescue, surgeons and medical students, paracord enthusiasts & hobbyists. Over 195 Animated Knots tied step-by-step using rope, paracord or other material are organized by ACTIVITY CATEGORY & TYPE: ACTIVITY CATEGORY - Arborist Knots (28), Boating & Sailing Knots (32), Climbing Knots (22), Fishing Knots (31), Decorative Knots (24), Household knots (24), Decorative knots (24), Horse & Farm knots (21), Scouting knots (31), Search and Rescue knots (22), Neckties (5) knots & Surgical ligatures (11). TYPE - Basic knots (8), Bends (14), End loops (22), Hitches (35), Mats (4), Mid loops (11), Quick Release (10), Slide & Grip (13), Splices (15) & Stopper knots (10). Watch knots tie themselves in simple step-by-step image animations, or click frame-by-frame (at your own speed) as you learn to tie each knot - using the NORMAL or MIRROR orientation (great for left-handers). When viewing a knot, simply tap INFO (top right) to get detailed descriptions about each knot's correct use, advantages & disadvantages, safety considerations, similar knots, alternatives, and other information. SEARCH for knots, view the complete knot list & save your FAVORITES for quick access. Better to know a knot and not need it, than need a knot and not know it. Excerpts from previous version reviews: "The Coolest Ever! Easy to understand and use, very informative with clear instructions on how to makes hundreds of knots step by step, divided by categories for easy navigation, truly inspiring and beautiful knots..." "I would pay twice the amount for this app. I would give it ten stars if I could."
Written user reviews are not shown here. Check current App Store reviews >
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
react-native-reanimated
expo-router
BUILD KIT DIFFICULTY
Intermediate
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.
