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.
Recruit the perfect cast and turn nine cards into one brilliant combo.
$3.99
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.
Your first Build Kit is free with a verified email.
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.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Recruit the perfect cast and turn nine cards into one brilliant combo. Castle Combo is the official digital adaptation of the award-winning card game created by Grégory Grard and Mathieu Roussel, illustrated by Stéphane Escapa and originally published by Catch Up Games. Choose characters from the Castle and the Village, arrange them in a 3×3 grid and create powerful combinations to score as many points as possible. Every card counts. Manage your gold, move the Messenger between the two markets and decide which character deserves a place in your realm. With 78 unique characters and countless scoring combinations, every game presents a completely new tactical puzzle. A BRAND-NEW SOLO CAMPAIGN Enjoy a campaign created especially for the digital edition. Complete increasingly challenging scenarios, adapt to special events and pursue different objectives as you master every corner of Castle Combo. BUILD THE PERFECT COMBO Recruit nine characters from two open markets. Combine their immediate abilities, conditions and end-game scoring effects to create the most valuable 3×3 combo. EASY TO LEARN, DEEP TO MASTER Castle Combo offers fast, satisfying games filled with meaningful decisions from the very first card. Experiment with new strategies, discover unexpected synergies and keep beating your best score. PLAY YOUR WAY Learn the rules with an interactive tutorial Play the original board game against bots with different difficulty levels Put your skills to the test in an exclusive solo campaign Enjoy automatic scoring and a smooth digital experience Play quick strategy games designed for mobile devices Castle Combo is a clever blend of card drafting, tableau building and combo creation—perfect for board game fans and anyone who enjoys fast-paced tactical challenges. Your combo only has room for nine characters. Choose wisely.
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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.
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.
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.