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
Fastinate: Fasting Made Simple
Transform your fasting journey with Fastinate - the zero-effort way to achieve your health goals.
$0.99 · In-app purchases
PRICE
$0.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 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 Fastinate: Fasting Made Simple: 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
Our clone can focus on simplicity with essential features only.
Assumption to check: Users often find fasting apps overly complicated with too many features
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their fasting durations and schedules.
Assumption to check: Lack of customization options for fasting plans
Validate with people who use this workflow before building.
Hypothesis 3
Implement better logging with reminders and session details.
Assumption to check: Poor tracking and logging of fasting sessions
Validate with people who use this workflow before building.
Hypothesis 4
Add social features for sharing progress and joining challenges.
Assumption to check: Limited social features for challenges and motivation
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
Transform your fasting journey with Fastinate - the zero-effort way to achieve your health goals. Fastinate eliminates the daily hassle of tracking your intermittent fasting schedule. Set your routine once, and we handle the rest automatically, every day. Simple, yet powerful: • Choose popular fasting methods (16:8, 20:4) or create your custom window • Automatic daily reset — no manual restarts needed • Clean, informative widgets for Home Screen and Lock Screen • Smart, fully customizable notifications that keep you on track without annoying you. Perfect for everyone: Whether you're new to intermittent fasting or a seasoned pro, Fastinate's set-and-forget approach helps you maintain consistency without the daily mental load. Focus on results, not tracking: With Fastinate handling the timing, you can focus on the benefits of your fasting routine — improved energy, better focus, and reaching your wellness goals. Discover how effortless your fasting journey can be with the most user-friendly companion available.
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
React Navigation
react-native-chart-kit
react-native-async-storage
shadcn/ui
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.
