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
Dose — Coffee Calculator
Brew better coffee with Dose — the beautifully simple calculator built for specialty coffee lovers.
$1.99
PRICE
$1.99
No 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Dose — Coffee Calculator: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Brew better coffee with Dose — the beautifully simple calculator built for specialty coffee lovers. Pick your method. Dial in your ratio. Start the timer. Dose handles the math so you can focus on the craft. BREW METHODS • Pour Over / V60 — clean, bright cups • French Press — rich, full-bodied brews • AeroPress — smooth, versatile extraction • Espresso — intense, concentrated shots • Cold Brew — smooth, mellow refreshment • Moka Pot — strong, bold stovetop coffee KEY FEATURES • Ratio calculator — adjust coffee and water with precision sliders • Step-by-step brew timer — guided instructions for each method • Temperature guide — optimal temp for every brew style • Brew log — save your favorite recipes for instant recall • Unit switching — grams/ounces, °C/°F • Works offline — no internet needed, ever • No accounts — no login, no sign-up, just brew • No ads, no subscription — pay once, yours forever • Privacy first — zero data collection, zero tracking
Written user reviews are not shown here. Check current App Store reviews >
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
Implement sharing functionality for results and saving favorites.
Assumption to check: Limited user engagement features such as sharing or saving calculations
Validate with people who use this workflow before building.
Hypothesis 2
Add user profiles to save preferences and history.
Assumption to check: Lack of user personalization options
Validate with people who use this workflow before building.
Hypothesis 3
Expand functionalities to include coffee recipes and brewing guides.
Assumption to check: Single use-case focus may limit audience appeal
Validate with people who use this workflow before building.
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
React Navigation
React Native Paper
Expo Clipboard
React Native Async Storage
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.
