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
Do Not Eat – Fasting Timer
Do Not Eat is a clean, distraction-free fasting timer for intermittent fasting
$2.99 · In-app purchases
PRICE
$2.99
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 included16 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 Do Not Eat – Fasting Timer: 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
Enhance the app with features like community challenges and personalized fasting plans.
Assumption to check: Users often find fasting timer apps too basic and lacking advanced features.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate gamification elements such as rewards for achieving fasting milestones.
Assumption to check: Many fasting apps do not provide sufficient motivation.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate health metrics tracking such as weight loss and energy levels.
Assumption to check: Lack of tracking for health metrics related to fasting.
Validate with people who use this workflow before building.
Hypothesis 4
Implement social sharing features and reminders to boost user engagement.
Assumption to check: Poor user engagement and retention.
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
Do Not Eat is a clean, distraction-free fasting timer for intermittent fasting. Start or stop a fast in one tap, see your progress at a glance on iPhone and Apple Watch, review your fasting history, and track your weight over time. Why you’ll like it: • Simple timer — Start, pause, resume, and save fasts quickly. • iPhone widgets — Check your fasting progress from your Home Screen. • Apple Watch support — See fasting progress from your wrist. • Live Activities — Keep your active fast visible from your Lock Screen and Dynamic Island. • Milestone timeline — See progress markers like 4h, 12h, 16h, 18h, 20h, 24h, 36h, 48h, and 72h with clear status messages. • Smart reminders — Get alerts for goal reached, streaks, and helpful nudges. • Stats and history — Track longest fast, averages, weekly totals, and more. • Weight tracking — Log weight entries and view progress with clean charts. • Custom goals — Choose common presets like 16:8, 18:6, OMAD, or set your own target. • Privacy first — No sign-up, no cloud account, and no tracking. Your data stays on your device. • Designed for focus — Minimal UI, dark-friendly design, and no noisy extras. • One-time purchase — No subscriptions. Made for intermittent fasting: Whether you’re doing 16:8, 18:6, OMAD, or extended fasts, Do Not Eat helps you stay consistent with an easy timer, helpful notifications, clear progress, and at-a-glance tracking across iPhone and Apple Watch. Notes and disclaimer: • Intended for general wellness and time tracking only. • Not a medical device and not medical advice. • If you have a medical condition, are pregnant, or have dietary concerns, talk to a qualified professional before changing eating patterns.
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 Paper
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.
