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.
App Overview
CastleMap
Explore over 64,800 castles, fortresses, and palaces across 129 countries.
$2.99
PRICE
$2.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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.
What's included
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Explore over 64,800 castles, fortresses, and palaces across 129 countries. CastleMap brings together data from four authoritative sources into one beautiful, easy-to-use map. One-time purchase — no subscriptions, no ads, no tracking, no hidden costs. INTERACTIVE MAP Tap castle-shaped bubbles to drill down from world view to regional clusters to individual castle pins. Switch between Standard, Hybrid, and Satellite views. Search by name or jump to any coordinates. SMART FILTERS Filter by Notable castles (with Wikipedia articles), Heritage-listed sites, UNESCO World Heritage sites, or castles with photos. Combine filters with intuitive Venn diagram controls to find exactly what you're looking for. COLOR-CODED PINS Green for UNESCO, Amber for Heritage, Pink for Photos, Blue for Notable. Instantly see which castles have special significance. BROWSE & DISCOVER Explore by country, castle type, architectural style, construction material, or condition. View pie chart statistics across every category. Try a random castle to discover something new. NEAR ME Find nearby castles sorted by distance. Get driving directions via Apple Maps. Use the live compass radar to see castles around you in real time. Switch between list, map, and compass views. PHOTOS & DETAILS Over 20,700 castles include photos. View detailed information including year built, architectural style, construction material, condition, heritage status, opening hours, and Wikipedia links. FAVORITES & VISITED Save your favorite castles. Mark castles as visited with dates and star ratings. Add personal notes. Export your favorites or visited list as CSV. COMPREHENSIVE DATA Built with data from OpenStreetMap, Wikidata, UNESCO World Heritage, and Wikipedia. Over 28,800 heritage-listed castles. 347 UNESCO World Heritage castle sites. 22,100 with Wikipedia articles. All data is included in the app. No internet connection required for core features. No account needed.
Written user reviews are not shown here. Check current App Store reviews >
Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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.
Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
