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.
The most popular bedtime story on the App Store! Over 4 million downloads.
$3.99 · 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.
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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 Nighty Night!: map the core Entertainment 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 story selection
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High price for full access
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of personalization features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline access
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.
The most popular bedtime story on the App Store! Over 4 million downloads. „App of Year“ awarded by Apple! "Nighty Night!" is the perfect App for a daily go-to-sleep ritual with cute animals, sweet lullaby music and great narration. All around the house the lights go out, and in the barn even the animals are tired. But who puts them to bed? Who turns out the lights in their stalls? That is the task for small children aged 1-4. Watching all the animals go to sleep is a lovely way to set the mood for bedtime. "You feel as if you are playing inside of a beautifully animated movie." // USA TODAY / 4 stars out of 4 "Nighty Night!" is brought to you from Oscar-Nominee Heidi Wittlinger (2002, best animated short) who brings a lot of passion and effort in constructing little sets made of paper and combining them with 2D illustration and animation. HIGHLIGHTS: 1. Stunning designs by Oscar nominated artist Heidi Wittlinger 2. Illustration and animation in 2D 3. Thirteen interactive animals (Dog, Pig, Sheep, Duck, Cow, Fish, Chicken, Pony, Spider, Goat, Cats, Rabbit etc.) 6. Switch between winter and summer version 7. Autoplay function 8. Languages: English, German, Spanish, French, Dutch, Swedish, Italian, Portuguese, Russian, Turkish, Chinese and Japanese. FEEDBACK FROM APP USERS: "This book finally proves to me that a kids book can be as great electronically as they are on paper. The artwork is stunning, the narration is pitch perfect well suited to its theme. (...) Buy this book, it´s truly art" PRESS: "There's bags of innovation happening right now around Apps for children, especially those that blend storytelling, animation and interactivity. Nighty Night! is one of the latest and greatest examples." // THE GUARDIAN UK "Overall this is my new top recommendation for bedtime books with interactivity." // Digital Storytime / 5 stars out of 5 "Nighty Night is a truly gorgeous ebook to add to your literary stash - and lull the kids into the Land of Nod." // Kids Book Review "What I liked: Everything. Nighty Night is simple, subtle, and clever. It is an App that very young children will enjoy and demand to use again and again." // PadGadget / 5 stars out of 5 "Nighty Night! is a must-have bedtime companion for your digital wunderkids!" // The ikids blog Please also check out our other great Apps for kids: „PETTING ZOO“ - is a fantastic storybook app for the iPad and iPhone. It features beautiful, fun, interactive animations of over 20 animals, and it’s bound to be a big favorite for kids and animal lovers of all ages. „LITTLE FOX MUSIC BOX“ – is a sing-along songbook with more than 100 interactive elements in 3 songs and the little fox music studio where you can record your own songs. If you experience any trouble with the App or have any questions or comments, please don't hesitate to contact us any time: [email protected]. We´d love to help you out. Please also mention your device version and your iOS version. Please also visit our website www.foxandsheep.com for more information and support. About Fox & Sheep: We are a Studio in Berlin and develop high quality apps for kids at the age of 2-8 years. We are parents ourselves and work passionately and with a lot of commitment on our products. We work with the best illustrators and animators around the world to create and present the best apps possible – to enrich the lives of our and your kids.
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.