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
CupTaster
Cupping (or cup-testing) is a coffee tasting method used in the coffee industry
$1.99 · In-app purchases
PRICE
$1.99
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/
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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 CupTaster: map the core Food & Drink 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
Enable users to add new coffee types and cafes to enrich the database.
Assumption to check: Limited coffee options without user-generated content
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing options to enhance user engagement.
Assumption to check: Lack of social features for sharing reviews
Validate with people who use this workflow before building.
Hypothesis 3
Implement a rewards system for frequent reviewers and favorites.
Assumption to check: Potential for low user retention due to lack of rewards
Validate with people who use this workflow before building.
Hypothesis 4
Utilize user preferences and ratings to suggest coffees and cafes.
Assumption to check: No personalized recommendations
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
Cupping (or cup-testing) is a coffee tasting method used in the coffee industry. It is performed all over the world according to uniform standards and specific protocols. The main purpose of cupping is to reveal the profile of the coffee. To achieve this, coffee is brewed in a universal way: ground coffee beans are placed in a glass, poured with hot water and left to steep undisturbed for four minutes. This method allows the coffee's flavor and aroma to fully develop. Cuppings are held at all stages of the coffee selection process, from the farm to the coffee shop. It is also an effective method for tasting and comparing several lots simultaneously. Baristas attend cuppings to gain insight into the potential of coffee beans and how to work better with a particular one. Those new to coffee attend cuppings to gain a deeper understanding of their preferences and to identify their preferred coffee origins. This is why we have developed a user-friendly and intuitive application with forms to fill in all characteristics according to world standards. It stores all the data so you can always go back and find something you like.
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
Supabase
Zustand
React Navigation
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.
