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
Caffiend - Caffeine Tracker
Introducing Caffiend: Your Ultimate Caffeine Tracking Companion
$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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Combine features and design from your favorite apps.
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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 included18 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 Caffiend - Caffeine Tracker: map the core Health & Fitness 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
Implement barcode scanning for beverages to streamline logging.
Assumption to check: Users often find it tedious to log every caffeine intake.
Validate with people who use this workflow before building.
Hypothesis 2
Provide more detailed analytics and recommendations based on user data.
Assumption to check: Limited insights into caffeine consumption patterns.
Validate with people who use this workflow before building.
Hypothesis 3
Add customizable notifications for daily logging.
Assumption to check: No reminders for logging entries.
Validate with people who use this workflow before building.
Hypothesis 4
Utilize more user-friendly paywall designs and offer clear value for premium features.
Assumption to check: In-app purchase prompts may be irritating.
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
Introducing Caffiend: Your Ultimate Caffeine Tracking Companion Caffiend is your all-in-one solution for tracking caffeine and hydration intake. Designed to integrate seamlessly with iOS, Caffiend leverages powerful features like Health app synchronization, interactive widgets, and a sleek, modern user interface to make tracking your intake effortless. Why Choose Caffiend? • Quick Logging: With one-tap access to your favorite drinks, logging your daily coffee, soda, or energy drinks is a breeze. • Comprehensive Insights: The Home Screen provides a clear view of your daily totals and a graphical breakdown of your past week, helping you stay informed and in control. • Detailed History: The Caffiend Journal lets you explore your caffeine and hydration habits over days, weeks, and months. Made a mistake? No problem—quickly edit your entries, and updates will sync directly with Apple Health. Designed for Modern Lifestyles Caffiend adapts to your preferences with support for Dark Mode, Siri shortcuts, and more. Best of all, Caffiend is a one-time purchase—no subscriptions, ever. You can also now track your daily intake right from your watch! The Caffiend Apple Watch app shows your current caffeine and hydration amounts, with support for logging entries from your wrist coming back next. Your Feedback Matters If you love using Caffiend or have an idea to make it better, your feedback on the App Store means the world. Leave us a review and follow us on X @creative_ave for updates, and let us know how we’re doing! Download Caffiend today and take control of your caffeine and hydration intake like never before.
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
Zustand
react-native-charts-wrapper
@react-navigation/native
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.
