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
Gem Genius AI
Gem Genius: Your On-Device Gemstone & Diamond Companion
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 ratings · Below Average
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 Gem Genius AI: map the core Shopping 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
Expand the database and offer user submissions.
Assumption to check: Limited gemstone database leading to user frustration
Validate with people who use this workflow before building.
Hypothesis 2
Standardize UI components for a cohesive look.
Assumption to check: Inconsistent UI design across screens
Validate with people who use this workflow before building.
Hypothesis 3
Optimize images and implement caching.
Assumption to check: Slow loading times for images
Validate with people who use this workflow before building.
Hypothesis 4
Add a community feature for users to share experiences.
Assumption to check: Lack of user engagement features like community reviews
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
Gem Genius: Your On-Device Gemstone & Diamond Companion Meet the rebuilt Gem Genius — a free, privacy-first app for anyone who loves gemstones, diamonds, and fine jewelry, whether you're a collector, a shopper, or just curious what's in your jewelry box. AI Jeweler Chat - On-device AI conversation powered by Apple's on-device models — no API key, no network call, no data leaving your phone - Grounded in the app's own encyclopedia for accurate answers - Recognizes gems mentioned in conversation and shows their photo inline Learn - Encyclopedia: 20 gemstones with origins, hardness, treatments, care instructions, and price ranges - Dictionary: 69 terms covering the 4 Cs, cut shapes, settings, and lab-created materials - Hallmark database: 21 assay and maker's marks by country - Diamond 4Cs visualizer: an interactive 2D breakdown plus a rotating 3D diamond with a Tilt to Sparkle mode - On-device gem identification from a photo, color-matched against the encyclopedia Buying Center - Step-by-step buying guide, red-flag checklist, and budget planner - A clearly labeled educational value estimator (not a live market feed) - Live industry news from Rapaport and JCK, each story shown with its real editorial photo - Untracked links to reputable places to buy, grade, insure, or sell Vault - A private, on-device collection tracker for your own pieces — photos, purchase details, and estimated value - Export your data as CSV for free, or as a polished PDF report with Gem Genius Premium Everywhere You Need It - Home Screen widget for Gem of the Day - Siri & Shortcuts support for birthstone and gem-of-the-day questions - Spotlight search across every gemstone, term, and hallmark - Shareable branded cards for any gemstone or term EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Gem Genius is free to download. Gem Genius Premium is an optional subscription that unlocks PDF vault reports, and Gem Genius Pro Tools is a one-time $5 unlock for advanced identification, branded reports, an AI Buying Coach, hallmark research, pro calculators, multi-folder vaults, and printable care cards. Nothing previously included has been moved behind a paywall.
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
Redux
Firebase
React Navigation
Axios
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.
