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
HoroClock
HoroClock turns the real-time positions of the planets into a beautiful clock face — astronomy and astrology, alive on your screen.
$2.99 · In-app purchases
PRICE
$2.99
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's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 HoroClock: map the core Entertainment 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
Provide richer content in horoscopes and compatibility insights.
Assumption to check: Lack of in-depth personalized content
Validate with people who use this workflow before building.
Hypothesis 2
Enhance user engagement with quizzes and daily notifications.
Assumption to check: Limited interactivity
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to share their horoscopes on social media.
Assumption to check: No sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Offer a premium subscription model for an ad-free experience.
Assumption to check: Ad-based monetization can be intrusive
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
HoroClock turns the real-time positions of the planets into a beautiful clock face — astronomy and astrology, alive on your screen. The hour and minute hands tell the time. Around them, the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn orbit at their true ecliptic longitudes, calculated from astronomical algorithms. LIVING STARFIELD Over 1,600 stars from the HYG Star Database glow in their actual spectral colors. Bright stars shimmer with a halo effect that intensifies after dark. The sky tint shifts in real time with sunrise and sunset at your location. During meteor-shower seasons, shooting stars streak from the correct radiant point. SERIOUS ASTROLOGY TOOLS • Tropical and Sidereal zodiac (Lahiri, Babylonian Fixed, custom SVP) • 4 house systems: Whole Sign, Placidus, Equal, Regiomontanus • Ascendant, Midheaven, Part of Fortune, Lunar Nodes • Toggle Uranus, Neptune, and Pluto on or off • Fixed-star display on or off YOUR LOCAL SKY HoroClock calculates the Ascendant and Midheaven from your latitude and longitude, so the chart reflects the sky above you, right now. A CLOCK YOU ACTUALLY USE Leave it running and glance at it throughout the day — the planets drift slowly along the zodiac, the sky color shifts, and occasionally a shooting star crosses the dial. Double-tap to switch to a detailed list of all planetary positions. No ads. No subscription. One-time purchase.
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
axios
react-query
react-native-picker
expo-router
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.
