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.
Plan Heidelberg with confidence - before your first step on the cobblestones.
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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 Heidelberg Walking Tours Guide: 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 due to lack of social features.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Insufficient tour information can lead to user dissatisfaction.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulty in discovering new tours.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High bounce rate from potential users due to upfront payment.
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.
Plan Heidelberg with confidence - before your first step on the cobblestones. Heidelberg Explorer is the calm, English-language travel guide for visitors who want the castle, the Old Bridge, the Old Town lanes, and richer local stories without spending their trip buried in search results. Built for travelers from the US, UK, Canada, and Australia — especially first-time visitors, river-cruise guests, day-trippers, couples, and travelers 50+ who prefer clear pacing over a rushed app. WHY TRAVELERS CHOOSE HEIDELBERG EXPLORER - Curated walking routes for first-time visits, romantic Old Town moments, Mark Twain's Heidelberg, castle views, river panoramas, rainy days, cruise stops, and easier senior-friendly walks - Clear route details: duration, distance, difficulty, stop order, and walking notes you can trust - Audio stories at selected stops — short listens or deeper context, whatever the moment asks for - Explore offline with 20 curated routes and audio stories at every key stop - Practical guidance for Heidelberg Castle, the Old Bridge, Philosopher's Walk, University Square, Kornmarkt, the castle gardens, and the Neckar riverfront - Ticket and tour pointers where advance planning saves you time on the day - Map previews with quick handoff to Apple Maps when you're ready to move - Filters for time, walking comfort, weather, and travel style - A calmer interface designed for real travel days — not endless scrolling ESPECIALLY USEFUL FOR - First-time visitors to Heidelberg - Travelers 50+ who prefer clear pacing and fewer surprises - River-cruise passengers with limited time ashore (AmaWaterways, Viking, Avalon, Uniworld) - US visitors following Mark Twain's "A Tramp Abroad" - UK travelers planning a short German city break - Couples, photographers, history lovers, and slow travelers HEIDELBERG IS BEAUTIFUL — AND CAN BE STEEP, COBBLED, AND CONFUSING WITHOUT A PLAN This guide helps you see more of what matters, skip unnecessary detours, and move through the city with a little more confidence. Download before you arrive and turn Heidelberg into a clear, walkable, story-rich day.
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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.