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.
Violet is a bat who sleeps all day
$5.99 · 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.
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.
Rork plan preview for Adventures of Violet & Lainey: map the core Books workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Violet is a bat who sleeps all day. Lainey is a ladybug who sleeps all night. They're best friends who never get to play together — until one special day when Lainey asks Violet to stay awake and see the sunshine. Based on the picture book by Mindy Jenkins, this is a gentle 19-page bedtime adventure your child can read, hear, and play their way through. READ IT TOGETHER • Every page is narrated aloud • Tap any single word to hear it on its own — lovely for early readers • Put your child's name on the title page • Choose "Just the Story" for a quiet ten minutes, or "Story + Games" for the whole adventure • It remembers where you stopped EIGHTEEN GAMES ALONG THE WAY • Paint the story scenes, or make your own picture on a blank canvas • Build a kite and fly it • Count butterflies and catch them in the right net • Find your way through the bushes • Match the fishes, pop the bubbles, catch the apples • Play tic-tac-toe, remember the fireflies' pattern, fill the treasure chest • Make a song with the owl • Tuck Violet and Lainey into bed at the end MADE FOR LITTLE ONES • No ads. Ever. • No in-app purchases • No accounts, no sign-ups • Works completely offline — perfect for cars and planes • Collects no data whatsoever. Your child's name is saved on your device only and is never sent anywhere. Ages 2–6. Best enjoyed side by side at bedtime.
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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 content variety for kids' books.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Subscription model may deter users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor discoverability of stories.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: User engagement can drop after initial use.
Validate with people who use this workflow before building.
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.