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.
A clear and accurate Schengen 90/180 day calculator to help you make the most of your allowance under the 90 in 180 days rule
$2.99 · 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 90 Days in Schengen Calculator: 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 feel overwhelmed by travel planning complexity.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulty in tracking travel days accurately.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inadequate customization options for trips.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited communication features for sharing plans.
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.
A clear and accurate Schengen 90/180 day calculator to help you make the most of your allowance under the 90 in 180 days rule. Easily adjust the length of any planned trip and instantly see how many more days you could stay in the Schengen area within any 180‑day window. The app is designed to be intuitive and reliable, with flexible trip management and a clear view of your day counts at each point. Plan and adjust your trips effortlessly • Insert and remove trips in any date order • Add trips within a selected date window using Insert, or at any date using Quick Add • Tap any start or end date to change it • Give trips a name and toggle trip names on or off. • Shows the running total of Schengen days counted by the end of each trip 180‑day view • Choose any date to see the total days used or planned in the 180‑day period starting or ending on that date • View a scrollable 180‑day calendar graphic showing your trips and their names Trip organisation • View all trips together, or only past trips, or only current and future trips • Use “Clear old trips” to remove previous trips that no longer affect your allowance Display options • Switch between day/month/year and month/day/year formats • Adjust text size for easier reading iCloud sync • Your trips are stored in your personal iCloud space and sync automatically across your devices Notes: The app calculates day counts based on the Schengen 90 days in any 180 days rule and the travel dates you enter. Final decisions on entry and length of stay are made by border and immigration authorities, and users remain responsible for verifying their own compliance with Schengen regulations. Always check your own situation against official guidance, especially if you have a visa, residence permit, long-stay visa, previous overstay or other special circumstances. Visit our website crocodilesandwichapps.com for links to information about the Schengen rule. App Preview video music from: A walk in Paris by Yevhen Onoychenko
Written user reviews are not shown here. Check current App Store reviews >
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.