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.
Don't lose your first few days of travel to fatigue.
$3.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for JetLagZero: map the core Travel workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Travel apps often lack personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Users struggle to manage multiple trips.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor user engagement features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High churn rate due to unclear value proposition.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Don't lose your first few days of travel to fatigue. Most travelers try to adapt after they land. JetLagZero helps you adapt during your flight. Using advanced chronobiology, JetLagZero calculates the perfect in-flight window to shift your internal body clock. By strategically timing your exposure to light, sleep, and caffeine, you can trick your circadian rhythm into aligning with your destination before you even leave the airport. THE DESTINATION-SHIFT PROTOCOL: • Smart Flight Parsing: simply input your flight details. We handle the complex time-zone math for direct or multi-leg journeys. • Light & Dark Therapy: Know exactly when to seek light and when to wear a mask. Light is the #1 signal your brain uses to reset its clock. • Caffeine Strategy: Use caffeine as a precision tool. We tell you exactly when to consume it for alertness and when to cut it off to build sleep pressure. • Precision Naps: Calculated sleep windows and "Stay Awake" zones designed to align with your arrival time. • Melatonin Schedule: Exact timing recommendations to chemically signal your brain that it’s time to sleep. • Hydration Tracking: Reminders to combat dry cabin air and keep your body primed for adjustment. BUILT FOR TRAVELERS: • 100% Offline Mode: No Wi-Fi required. Once your flight is loaded, the entire protocol works in the air. • Push Notifications: Don't watch the clock. We alert you exactly when you need to change your behavior. • Calendar Sync: Export part or your entire custom schedule directly to your device calendar. PRIVACY FIRST: Your travel data stays on your device. JetLagZero does not collect, store, or transmit your flight details or personal information to the cloud. All calculations are performed locally on your phone. Travel smarter. Arrive ready. Download JetLagZero today.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.