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
PlanetClock - Minimalist Clock
This is a simple clock app whose design has some similarities to a planet orbiting a star
$0.99 · In-app purchases
PRICE
$0.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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 PlanetClock - Minimalist Clock: 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
Include more themes and background images for personalization.
Assumption to check: Limited customization options for clock display
Validate with people who use this workflow before building.
Hypothesis 2
Add features like snooze, multiple alarms, and custom sounds.
Assumption to check: Alarm functionality may be basic
Validate with people who use this workflow before building.
Hypothesis 3
Implement a rewards system for using the app regularly.
Assumption to check: Potential lack of user engagement
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share clock themes or alarm settings with friends.
Assumption to check: No social sharing features
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
This is a simple clock app whose design has some similarities to a planet orbiting a star. I hope it can accompany you just like a planet, becoming an unchanging companion in your life. - Display the date in large fonts - Widgets - Switch between portrait and landscape mode - Switch between 12/24 hour clock - This application runs completely offline - Option to show the second hand of the clock - Option to display the date or clock separately - Option to display the upcoming holidays - Option to display an approximate position of the sun - Switch between dark or light color schemes - Support StandBy on iPhone (this feature requires iOS 17 or higher) - Support multitasking on iPad (iPad Split View, Slide Over and Stage Manager) - Support older models: On early models such as iPhone 5s, iPad mini 2, iPad Air, and iPod touch (6th generation), this app can be used when running iOS 11 and above (widget functionality requires iOS 14 or higher) NOTES: - By default, your device’s Auto-Lock is disabled while the app is active in the foreground.
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
Zustand
React Navigation
React Native Paper
Firebase
BUILD KIT DIFFICULTY
Starter
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.
