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.
Schengen Simple answers the key question that other apps don't: what's the longest I can travel on any given date without jeopardising a future trip or breaking the 90/180 rule?
Free · 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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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 Schengen Simple: 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 country visa information
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No in-app notifications
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Subscription pricing lacks clarity
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.
Schengen Simple answers the key question that other apps don't: what's the longest I can travel on any given date without jeopardising a future trip or breaking the 90/180 rule? Here's an example. Say you have a trip next week and another in 2 months, and you want to add one in between. Schengen Simple tells you exactly how long that middle trip can be without causing an overstay. You'll always know how long you can travel while ensuring you can still take every trip in your calendar. FEATURES - No need to nominate a date of entry. Schengen Simple analyses your full trip calendar at once, so you always know how long you can travel on any date without affecting trips you've already planned. - Multi-traveller support. Track Schengen allowance for your whole family or travel group in one app, each with their own calendar and calculations. - Passport Control mode displays exactly how long you've been in the Schengen Area in a given 180-day period. - See your allowance under every date in the calendar, so you can spot when it changes and plan accordingly. Often, waiting a few days gives you a longer stay. - Allowance Analysis. Easily probe why your allowance is what it is for a given date, so you know which trips you could edit to stay longer. - Personalised customer support. Questions about your trips or the rules? Get a real reply from a real person. - The Schengen Simple algorithm is thoroughly tested, including against the official EU calculator, so you can fully trust its calculations. - Clear, simple and easy to use. Even calculators deserve beautiful design. PRICING Get started with a one-week free trial, after which an annual subscription gives you full access to all features. Prices vary by country. Your subscription supports ongoing updates as Schengen rules evolve, personalised support from a real person when you need it, and we'll never sell your data or show ads. Try Schengen Simple for free, with no obligation to continue. We think you'll love it. Privacy Policy: https://schengensimple.com/privacy-policy Terms of Use: https://schengensimple.com/terms-of-use
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.