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
iPhemeris Astrology Ephemeris
iPhemeris Ephemeris – Professional Astrology Ephemeris
$34.99 · In-app purchases
PRICE
$34.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
50 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 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.
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 iPhemeris Astrology Ephemeris: 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
Offer extensive customization features for personalized charts.
Assumption to check: Limited customization options for charts
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a freemium model with basic features available for free.
Assumption to check: High price point for premium features
Validate with people who use this workflow before building.
Hypothesis 3
Implement onboarding tutorials to guide new users.
Assumption to check: Lack of interactive tutorials
Validate with people who use this workflow before building.
Hypothesis 4
Enhance search capabilities with filters and suggestions.
Assumption to check: Poor search functionality
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
iPhemeris Ephemeris – Professional Astrology Ephemeris iPhemeris is a precision ephemeris built for serious astrologers. Covering 1700–2100 (extendable to 7700 years), it delivers comprehensive planetary data with sub-second accuracy based on JPL DE431 ephemerides. **** IMPORTANT: This app is an astrology ephemeris only. It does not create birth charts. View tropical or sidereal positions for GMT, noon, or any custom time and location. Fully supports Vedic astrology with 17 ayanamsas, plus the ability to define your own. Replace bulky ephemeris books and static files with a fast, flexible, always-available tool designed for real work. Core Features Monthly longitude tables from 1700–2100 (extendable to 7700 years via In-App Purchase) Geocentric, Topocentric, and Heliocentric modes (Topocentric & Heliocentric via In-App Purchase) Monthly declination and latitude tables Graphic Ephemeris (longitude or declination) (In-App Purchase) Traditional Midnight or Noon GMT ephemeris, or any custom time and time zone Tropical and Sidereal positions with 17 predefined ayanamsas, or create your own Celestial Objects Planets: Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto Asteroids: Chiron, Vesta, Pallas, Juno, Ceres, Cupido, Hygiea, Astraea, Eris, Sedna Nodes: North Node (Mean or True) Black Moon (Lilith) Tables & Data Dual Moon columns (current position + 12 hours later) Moon phase tables (GMT and local time) Eclipse tables (date, time, duration, magnitude, max location, gamma) Planetary ingress tables (sign changes) Equinox and solstice times Void of Course Moon tables (In-App Purchase) Sidereal time Planetary directions Customization & Navigation Select which planets, asteroids, and points to display Navigate by month or jump to any date instantly SkyNow Real-time sky chart for your current location Show 800+ Fixed Stars In-App Purchases Extended Ephemeris: Expand to 7700 years (4700 BC – 2995 AD), add heliocentric and topocentric modes, plus additional bodies including Vulcan (hypothetical) 800+ Fixed Stars Graphic Ephemeris: Visualize planetary motion and harmonic ranges Uranians: Adds 8 Hamburg School hypothetical bodies Additional Asteroids: Hygiea, Astraea, Eris, Sedna Void of Course Moon Tables Terms of Service - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy - https://iphemeris.com/privacy/
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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
TypeScript
React Navigation
Zustand
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.
