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
Endless Crown
Endless Crown is a watch-only haptic fidget that turns spinning the Apple Watch Digital Crown into quiet tactile feedback.
$0.99
PRICE
$0.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Endless Crown: map the core Lifestyle 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
Allow users to customize crowns with more features like adding gems or patterns.
Assumption to check: Limited crown customization options
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing to showcase crowns on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Introduce achievements and rewards for crown collection milestones.
Assumption to check: Lack of gamification
Validate with people who use this workflow before building.
Hypothesis 4
Implement a way for users to provide feedback on crowns and features.
Assumption to check: No user feedback system
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
Endless Crown is a watch-only haptic fidget that turns spinning the Apple Watch Digital Crown into quiet tactile feedback. Open Endless Crown, rotate the Digital Crown, and feel a crisp haptic response as you scroll through an infinite numbered list. The interface stays dark and minimal, making it easy to use for a quick tactile break without pulling out your phone. Choose from 15 haptic effects: - Clicks - Soft - Heavy - Buzz - Ping - Thud - Drift - Pulse - Heartbeat - Double Tap - Gallop - Waltz - Staccato - Wave - Random Endless Crown also includes local usage statistics, ambient mode, configurable number formats, and a WidgetKit complication that shows your current item and total haptic count. Highlights: - Built exclusively for Apple Watch - Uses the Digital Crown as the main interaction - Silent haptic feedback - Fast effect switching - Decimal, Roman, Binary, Hex, Octal, and Base-26 number formats - Local-only preferences and stats - No account, ads, analytics, or backend How to use: 1. Open Endless Crown on Apple Watch. 2. Rotate the Digital Crown to scroll and feel haptics. 3. Tap the number line or effect chip to cycle effects. 4. Long-press the number line or effect chip to open the Effects picker. 5. Double-tap the number line or effect chip to open the menu. 6. Use the menu to change effects, number format, statistics, guide, reset, ambient mode, or menu icon visibility. Endless Crown requires Apple Watch with watchOS 10 or later.
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.
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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.
