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.
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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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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 Country Days Tracker: 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: Limited user engagement features such as social sharing.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No offline functionality.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Basic analytics and stats.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of reminders to encourage app usage.
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.
Included in British Airways High Life's list of 24 Inexpensive Items That Will Transform Your Travels Download now — and never count travel days manually again. Essential for frequent travelers, digital nomads, and expats. Country Days Tracker shows exactly how many days you’ve spent in each country — no spreadsheets, no guesswork. • No account. No email. No personal data required. • Works offline. • Useful for visa rules, tax residency, and residence permits. ▶ AUTOMATIC COUNTRY DAY COUNTING Track how many days you've spent in each country over the last 183 or 365 days — or set any custom date range. Choose how days are counted (e.g., count only if you stayed overnight). View clean country-by-country timelines. ▶ STAY LIMIT MANAGER Track legal stay limits for any country. Set a limit, pick a date range, and get automatic updates as you travel — perfect for: • Tax residency rules • Residency permit conditions • Dual citizenship restrictions • Tourist visa limits • Permanent residency requirements • Health insurance eligibility based on days present Whether you're managing stays for legal compliance or long-term planning, Stay Limit Manager makes it effortless. ▶ SCHENGEN CALCULATOR Know how many days you have left under the 90/180-day rule. Perfect for travelers bouncing in and out of Europe. ▶ CUSTOM AREAS Track specific locations — for example, how often you visit your grandmother in a neighboring town, or how many days you’ve spent in New York for tax purposes. Ideal for state-level tax residency, part-time living, or personal records. ▶ RESTORE FROM PHOTOS Rebuild your travel history. Scan your photo library to recover past visits using date and location metadata. ▶ RESTORE FROM FLIGHTS Import travel data from flight tracking apps to restore your country visit history quickly and accurately. ▶ AIR & SEA DAYS Log how many days you spend flying or at sea. Great for airline crew, cruise travelers, and seafarers. ▶ WIDGETS See your country stats at a glance right from your Home Screen. ▶ WORLD MAP View your travel history on an interactive world map. Share your personal map as a photo, video, or Reel. ▶ PDF EXPORT Generate a professional-looking PDF of your visit history. ▶ ATTACHMENTS & PROOF PHOTOS Attach photos and documents to any day — tickets, bookings, or personal notes. Add photos with date and location to keep proof of your stay. Perfect for visas, tax residency, and official records. ▶ LIVE ACTIVITY Quickly access your latest attachments — tickets, bookings, and documents — right from your Lock Screen. Stay organized while traveling, without opening the app. Download now and travel smarter. No setup. No friction. Just effortless day tracking — built for travelers who care where their days go. ----------------------------------- If you choose to purchase Country Days Tracker Pro, payment will be charged to your Apple ID account at the confirmation of purchase. Subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Prices are in U.S. dollars, may vary in countries other than the U.S. and are subject to change without notice. No cancellation of the current subscription is allowed during the active subscription period. If you don’t choose to purchase Country Days Tracker Pro, you can simply continue using Country Days Tracker for free. Privacy Policy: https://countrydaystracker.com/privacy Terms of Use: https://countrydaystracker.com/terms
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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.