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.
"Editor´s Choice Award" by Children´s Technology Review for Excellence in Design!
$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 CHOMP by Christoph Niemann: 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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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 interactive content for children
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Not enough story variety
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: High subscription costs
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Cluttered navigation
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.
"Editor´s Choice Award" by Children´s Technology Review for Excellence in Design! wired.com: "It’s not quite a storybook, and not quite a video game. It’s ostensibly for kids, but its creative appeal is universal. It’s definitely digital, but feels analog. The app lives at the intersection of all these things, which is one reason it’s such fun to play." “CHOMP by Christoph Niemann” is the latest imagination from internationally renowned children’s author and illustrator Christoph Niemann, whose App ‘Petting Zoo’ is already loved by millions of children and families around the world. ‘CHOMP’ combines playful, humorous, and lovingly hand-drawn animations with live video, enabling children and adults alike to slip into a variety of comical roles. From a virtuous pianist, to a spaghetti-slurping dog, or a living cuckoo-clock, anything is possible! What makes this App so inspiring and special is that children participate using their own faces, mimicry, and song, allowing their creativity to run free. With the video functions, all of these adventures can be saved forever. ‘CHOMP’ is so easy and intuitive to use that kids can create and sing their own personal messages to send to parents, grandparents, friends, or siblings, all in the blink of an eye. Highlights : • Hand drawn animations made with love and care. • Over 50 hand-drawn scenes with countless funny animations. • Fun for all ages. • No language knowledge needed. The app is text-free. • No in-app purchases, invasive advertising, or data mining. • Record play sessions with integrated video recording. INSTRUCTIONS: • Children can swipe left and right to change animations. Tap the screen to see the fun. • Grownups can open the camera menu in the bottom left to record videos. Tap to microphone icon to enable sound recording, use the large center button to start and stop video recording. • Please enable camera permissions when prompted. Just as with his App ‘Petting Zoo’ and his New York Times blog ‘Abstract City’, Christoph Niemann uses ‘CHOMP’ to once again show us his own unique, absurd, and always funny view of the world. Press reviews: wired.com: "It’s not quite a storybook, and not quite a video game. It’s ostensibly for kids, but its creative appeal is universal. It’s definitely digital, but feels analog. The app lives at the intersection of all these things, which is one reason it’s such fun to play." Please also check out our other great App for kids: “PETTING ZOO” - is a fantastic storybook app. 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. 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.