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.
STAY COMPLIANT
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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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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 Days of Stay: Tax & Schengen: 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: Users often struggle with keeping track of days accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited reporting features can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulty in navigating between different sections.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Users may find the app lacks detailed customization options.
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.
STAY COMPLIANT. TRAVEL WITH CONFIDENCE. Never worry about tax residency or visa limits again. Days of Stay is the essential travel tracker for digital nomads, expats, and frequent travelers who need to stay compliant with cross-border regulations. Our app automatically calculates your days for the 183-day tax rule and the Schengen 90/180 rule, so you can focus on your journey, not the paperwork. WHY CHOOSE DAYS OF STAY? Unlike generic travel logs, Days of Stay is built for compliance. We provide a beautiful, intuitive, and privacy-first solution to a complex problem. No more spreadsheets, no more manual counting, and no more anxiety about your legal status abroad. AUTOMATIC & EFFORTLESS TRACKING • Smart Day Counter: Automatically tracks days for tax residency (183-day rule), Schengen visas (90/180 rule), and any custom rule you create. • Simple Trip Logging: Add past, present, and future trips in seconds. All you need is the country and dates. • Visual Timelines: See your entire travel history at a glance and understand how each trip impacts your compliance status. MASTER YOUR SCHENGEN STAYS • Real-Time Schengen Calculator: Always know exactly how many days you have left in the Schengen Area. • Exit & Re-Entry Dates: Get automatic calculations for your latest possible exit date and the earliest you can re-enter. • 90/180 Rule Expertise: Our algorithm is designed to handle the complexities of the rolling 180-day window, giving you peace of mind. TAX RESIDENCY, SIMPLIFIED • 183-Day Rule Tracker: Effortlessly monitor your physical presence to avoid becoming an accidental tax resident. • Multi-Country Support: Track your days across multiple jurisdictions simultaneously, each with its own rules. • Audit-Ready Data: Export your complete travel history for your tax advisor or personal records. BUILT FOR THE MODERN TRAVELER • Digital Nomad & Expat Focused: We understand the unique challenges of a location-independent lifestyle. • Privacy-First Design: Your data is yours. It's stored only on your device, works completely offline, and requires no account or login. • Beautiful & Intuitive: Designed with the latest iOS guidelines, our clean interface makes tracking your days a pleasure, not a chore. • Lightweight & Fast: At just 3MB, our app is incredibly efficient and won't slow you down. PERFECT FOR: • Digital Nomads managing tax obligations in multiple countries. • Expats navigating visa rules and residency requirements. • Frequent Business Travelers monitoring their Schengen allowance. • Remote Workers splitting time between different locations. • Global Citizens who want to travel smarter and stay compliant. DISCLAIMER: Days of Stay is a powerful tool for informational purposes, but it is not a substitute for professional legal or tax advice. Tax and visa laws are complex and vary by jurisdiction and personal circumstances. Always consult a qualified professional for advice specific to your situation. Download Days of Stay today and take control of your international travel compliance. Effortless, private, and built for you.
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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.