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
Salt Shack Minerals
LEARN
$19.99 · In-app purchases
PRICE
$19.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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/
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 Salt Shack Minerals: map the core Education 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 gamification elements to increase user engagement and motivation.
Assumption to check: Limited user engagement due to lack of interactive features like quizzes and progress tracking.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline course downloads to enhance accessibility.
Assumption to check: No offline access for learning materials, limiting usability in remote areas.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a free trial period or freemium model to attract more users.
Assumption to check: High price point may deter users from purchasing the app.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate user feedback systems to continuously enhance the app's content.
Assumption to check: Lack of user feedback options can lead to poor content improvement.
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
LEARN. QUIZ. EXPLORE. SaltShack Minerals combines learning, richly illustrated articles and collection tools in one app. Work through hundreds of bite-sized lessons covering mineralogy, geology and Earth science, reinforce your knowledge with quizzes, track your progress and develop a deeper understanding of our planet. Whether you're identifying your first mineral or expanding an established collection, there is always something new to discover. MINERAL REFERENCE Explore 246 detailed mineral profiles featuring high-quality photography, physical properties, crystal systems, geological context, history and real-world uses. Browse minerals, save favourites and test your knowledge with a dedicated quiz for each one. EARTH SCIENCE LIBRARY Access 368 pages covering minerals, rocks, geology and Earth science. Learn how minerals and rocks form, and how geological processes shape the world around us. Content is organised into short, accessible sections designed to be read in just a few minutes. QUIZZES AND CHALLENGES Test yourself with more than 300 quizzes covering minerals, geology and Earth science. Earn points, build streaks and unlock additional challenge modes as you progress. From mineral identification to challenging quizzes that draw on everything you’ve learned, each activity reinforces your understanding and highlights where to focus next. COLLECTION CATALOGUE Create a digital record of your mineral collection. Add photographs, record localities, save notes and organise your pieces in a searchable catalogue. FOR COLLECTORS, STUDENTS AND THE CURIOUS Use SaltShack Minerals as a reference guide, study companion and home for your collection. Learn at your own pace, develop practical geological knowledge and gain a deeper understanding of the minerals, rocks and processes that shape our planet. NOTE Salt Shack Minerals is a mineral education and collection app, not a rock identification app. It is designed to help users learn about minerals, crystal structures, geology, gemstone science, and mineral formation through educational content, quizzes, and collection management tools. Users can also build and catalogue their own digital mineral collection. While the app teaches the principles of mineral identification, it does not identify rocks or minerals from photos and does not use AI or image recognition.
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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
Zustand
react-native-reanimated
expo-router
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.
